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Change in kinetic energy

Practice: Calculating change in kinetic energy from a force. This is the currently selected item. Practice: Velocity and mass from force vs. position graphs. Work-energy theorem review. Next lesson. Spring potential energy and Hooke's law. Work and the work-energy principle The force over the distance is the work done, or change in kinetic energy. If you have a very massive object, the change in kinetic energy would be the SAME, but the resulting velocity would be lower! Log in or register to reply now The Work-Energy Theorem. The net work on a system equals the change in the quantity 1 2mv2 1 2 m v 2. W net = 1 2mv2 − 1 2mv2 0 W net = 1 2 m v 2 − 1 2 m v 0 2. The quantity 1 2mv2 1 2 m v 2 in the work-energy theorem is defined to be the translational kinetic energy (KE) of a mass m moving at a speed v

Kinetic energy is transferred between objects and can be transformed into other forms of energy. Yo-Yo is a great example to describe the transformation of kinetic energy. While beginning to play with it, one starts by letting it rest in the hand, at this point, all the energy is stored in the ball in the form of potential energy One can show that as a particle moves from pointri torf, the change in kinetic energy ofthe object is equal to the net work done on it: ∆K=Kf −Ki =Wnet (6.13) 6.1.5 Power In certain applications we are interested in therateat which work is done by a force. If a We call K(v) the kinetic energy'' of the object. We can say that the net work done on an object in going from A to B is equal to its change in kinetic energy (final kinetic energy minus initial kinetic energy). It is important to note that we defined kinetic energy in a way that it is equal to the net work done A change in the kinetic energy of an object is equal to the_____? A) force exerted on the object B) change in its mass C) net work done on the object D) velocity of the object . Physics. 1 Answer sjc Oct 21, 2017 #(C)# Explanation: the net work on. Everybody knows Physics, everybody without exception. We learn Physics from the day we are born, and we go on learning Physics every day thereafter - not in a classroom, mind, but in the University of Life. Heat is defined as the transfer of kinetic energy. Yesterday my wife brought her oil-filled radiator into our breakfast room. Quite idly, I stretched my right hand out to touch it, little.

In classical mechanics, kinetic energy (KE) is equal to half of an object's mass (1/2*m) multiplied by the velocity squared. For example, if a an object with a mass of 10 kg (m = 10 kg) is moving at a velocity of 5 meters per second (v = 5 m/s), the kinetic energy is equal to 125 Joules, or (1/2 * 10 kg) * 5 m/s 2 Use 3 significant digits for your answers. Use g = 10 m/s/s. Use the down ramp direction as the positive direction. When released from rest, mass 1 of 5 kg slides down the 30° ramp to reach a speed of 3 m/s after traveling a distance of 2 m. The ramp is rough and the coefficient of kinetic friction is uk = 0.20. Mass 2 is unknown It turns out that kinetic energy and the amount of work done in the system are strictly correlated, and their relation can be described by the work-energy theorem. It states that the work done by all external forces is converted into a change of kinetic energy: W = ΔKE = KE₂ - KE₁. Actually, there are several types of kinetic energies According to the work-energy theorem, the work done on an object by a net force equals the change in kinetic energy of the object.Work is the force on the object as it changes a distance. Interestingly, as work is done on an object, potential energy can be stored in that object I know that kinetic energy is supposed to change when I change the frame of reference. But I understand that then there must be some other kind of energy to make up for it so that the energy in the system stays unchanged. But I don't see any other kind of energy here. I only see two total energies of the same system that seem to be different

Calculating change in kinetic energy from a force

  1. Kinetic energy is the energy of motion, and the amount of kinetic energy that an object possesses depends on two things: the mass of the object and how fast it is moving. This means that a really.
  2. Kinetic Energy and Work The kinetic energy of an object is defined as 2 KE = 1/2 * m * v The kinetic energy of an object depends on its velocity. To change its velocity, one must exert a force on it. It turns out there's a connection between the force one applies to an object and the resulting change in its kinetic energy
  3. If we want to change the kinetic energy of a massive object, we must do work on it. For example, in order to lift a heavy object, we must do work to overcome the force due to gravity and move the object upward. If the object is twice as heavy, it takes twice as much work to lift it the same distance
  4. Kinetic energy is the movement energy of an object. Kinetic energy can be transferred between objects and transformed into other kinds of energy. Kinetic energy may be best understood by examples that demonstrate how it is transformed to and from other forms of energy
  5. Part F What is the change in kinetic energy between the initial and final states? Express your answer to three significant figures with appropriate units. ANSWER: Answer Requested Problem 15.38 A railroad car having a mass of 15 is coasting at 1.5 on a horizontal track. At the same time another car having a mass of 12 is coasting at 0.75 in the opposite direction
  6. Kinetic energy, form of energy that an object or a particle has by reason of its motion. If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy. Kinetic energy is a property of a moving object or particle and depends not only on its motion but also on its mass
  7. Proper statement is change of Kinetic Energy = Power×Time. Another remark: Kinetic Energy is not the only from of energy. There us potential energy of gravitation, there could be an,electric energy and potential energy in electric field, there could be temperature

The formula for calculating kinetic energy (KE) is KE = 0.5 x mv2. Here m stands for mass, the measure of how much matter is in an object, and v stands for the velocity of the object, or the rate at which the object changes its position You can operate in the same reference frame and still have an increase in kinetic energy. For example, if one object has a compressed spring attached to it that is set to release upon collision. Then the extra energy comes from what was the potential energy Science. Physics. Physics questions and answers. * Q1: What is the change in the kinetic energy for the block? * Q2: What is the total work done on the block? * Q3: What is the work done by the friction force on the block? * Q4: What is the work done by gravity on the block? * Q5: What is the work done by the push force on the block? * Q6: What. Let's calculate work done when velocities are given. Created by Mahesh Shenoy. Google Classroom Facebook Twitter. Email. Work energy theorem. Work-energy theorem. Work done from kinetic energy - solved example. This is the currently selected item. Practice: Calculating change in kinetic energy from a force Explain why the change in velocity is different in the two frames, whereas the change in kinetic energy is the same in both. Professional Application. A 30,000-kg freight car is coasting at 0.850 m/s with negligible friction under a hopper that dumps 110,000 kg of scrap metal into it

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Change in Kinetic Energy Physics Forum

According to work-kinetic theorem for rotation, the amount of work done by all the torques acting on a rigid body under a fixed axis rotation (pure rotation) equals the change in its rotational kinetic energy: W torque = Δ K E rotation. {W_\text {torque}} = \Delta K {E_\text {rotation}}. W torque. . Work done by a torque can be calculated by. Unlike elastic collisions, perfectly inelastic collisions don't conserve energy, but they do conserve momentum. While the total energy of a system is always conserved, the kinetic energy carried by the moving objects is not always conserved. In an inelastic collision, energy is lost to the environment, transferred into other forms such as heat states that the change in kinetic energy of an object is equal to the work done on it. The work done on it is F· d where F is the component of the net force in the direction of motion and d is the distance it moves. It is a powerful relationship that lets us predict how something will move. Us Change in Kinetic Energy. Students use a modified Atwood machine to study how the change in kinetic energy is related to the net force applied and distance travelled. They use sensors to collect position, velocity and force data. They analyze the relationship between the kinetic energy of the cart and the distance it travelled, discovering the. In this lesson we use the kinetic energy formula to find the kinetic energy of a mass and also how to solve for the change in an objects kinetic energy. The.

Kinetic Energy and the Work-Energy Theorem Physic

  1. 6.1.4 The Work-Kinetic Energy Theorem One can show that as a particle moves from point ri to rf, the change in kinetic energy of the object is equal to the net work done on it: ∆K = Kf −Ki = Wnet (6.13) 6.1.5 Power In certain applications we are interested in the rate at which work is done by a force. If a
  2. Kinetic energy is given by the formula. From this formula, we can observe that the kinetic energy of an object is directly proportional to the square of its speed. This means that the speed doubles and kinetic energy increases by a factor of four. If the speed increases by a threefold, the kinetic energy will increase by a factor of nine
  3. A semicircular disc of radius ′ r is re;eased from rest from the position shown. if no slipping occurs between the disc and the horizontal surface, In the expression for the angular velocity ω reached by the disc when its kinetic energy is maximum is ω = x (y π − z) r g r a d / s e c
  4. Potential energy is the stored energy in any object or system by virtue of its position or arrangement of parts. However, it isn't affected by the environment outside of the object or system, such as air or height. On the other hand, kinetic energy is the energy of an object or a system's particles in motion
  5. Inelastic Collisions Perfectly elastic collisions are those in which no kinetic energy is lost in the collision. Macroscopic collisions are generally inelastic and do not conserve kinetic energy, though of course the total energy is conserved as required by the general principle of conservation of energy.The extreme inelastic collision is one in which the colliding objects stick together after.

Kinetic Energy - The energy of motion. i.e., K = ½mv² Power - Work done per unit time. i.e., P = W/t OR Power is also rate at which energy/KE is spent or utilized We know that work is related to energy. So, P = dK/dt NOTE : HOPE IT WILL CLEAR YOU... The change in kinetic energy, the power output, and the turbine inlet area are to be determined. Assumptions 1 This is a steady-flow process since there is no change with time. 2 Potential energy changes are negligible. 3 The device is adiabatic and thus heat transfer is negligible. Properties From the steam tables (Tables A-4 through 6) 1 3240. Calculating kinetic energy If we know the mass of an object and its velocity we can determine the amount of kinetic energy. kinetic energy = 1/2 (mass of object)(velocity of object)2 or KE = 1/2 mv2 or KE = 0.5mv2 The SI unit for kinetic energy is the Joule (J). A Joule is a kilogram x meters/second

Change in kinetic energy can be equated with the work done on the body. This is often expressed as the work kinetic energy theorem. Are you PHYSICS READY?. Change in kinetic energy. An object in motion possesses kinetic energy. As the speed of the object increases the kinetic energy increases quadratically. According to the work-energy theorem, the. The standard free-energy change of a reaction ΔG°′ is the value of the change in free energy under the conditions of 298 K (25 °C), 1 atm pressure, pH 7.0 (as in pure water), and initial concentrations of 1 M for all reactants and products except protons, which are kept at pH 7.0 Work-Energy Principle. The change in the kinetic energy of an object is equal to the net work done on the object. This fact is referred to as the Work-Energy Principle and is often a very useful tool in mechanics problem solving Momentum, p, however, is related to kinetic energy, KE, by the equation KE= p 2 /2m. So a change in momentum corresponds to a change in kinetic energy. This is the essence of Newton's second law: Applying a force to a mass changes the momentum of that mass. An acceleration just represents this change in momentum for an object that has a.

What is Kinetic Energy? - Definition, Formula, Examples

  1. Changes of state require a transfer of energy. Water has unusually high-energy changes associated with its changes of state. Content Expectations: C2.2A - Describe conduction in terms of molecules bumping into each other to transfer Kinetic energy is the energy of motion . o
  2. Physics questions and answers. 1.What is the change in the kinetic energy of the block between the two diagrams? 2.What is the amount of compression of the spring in the second diagram? You will have to solve this first before you can go back to find the next three solutions. 3.How much work has been done by the friction force on the block by.
  3. tells us that the work acting on a system changes its kinetic energy by the amount equal to work W = K(t)−K(t 0)=∆K. (6.16) In fact what is relevant is the total work of all forces done on asystem,i.e. W tot =∆K. (6.17) This is called the work-energy theorem or an equation representing conser-vation of energy. Example 6.3
  4. Since, both the momentum and kinetic energy depend on velocity and mass, a change in one affects the other. Kinetic Energy and Momentum Relationship. Kinetic energy is the energy that any substance has when it accelerates, whereas momentum is an object's mass in motion. There is a kinetic energy and momentum relation due to their connection.

1 Answer. According to the work - energy theorem, the work done on an object by a net force equals the change in kinetic energy of the object. The following video shows an example problem of how to solve a problem using the work-energy theorem: Essentially kinetic energy is the energy used for motion. When things move, they can do work In short, kinetic energy is indeed the integral of momentum with respect to velocity. More accurately, the line integral of momentum with respect to the velocity vector at each point along a path gives the total change in kinetic energy. Physically, this represents the work done along the path Show work equals change in KE. You want to prove that the equation for work in terms of the change in kinetic energy of an object is: W = ΔKE. or. W = KE f − KE i. where. W is the work done against the resistance of inertia; ΔKE is the change in kinetic energy (Δ is Greek letter capital delta) KE f is the final kinetic energy of the object. Rotational kinetic energy and angular momentum. 11-1-99 Sections 8.7 - 8.9 Rotational work and energy. Let's carry on madly working out equations applying to rotational motion by substituting the appropriate rotational variables into the straight-line motion equations Kinetic energy, form of energy that an object or a particle has by reason of its motion.If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy.Kinetic energy is a property of a moving object or particle and depends not only on its motion but also on its mass.The kind of motion may be translation (or motion along a.

Video: 7.2: Kinetic energy and the work energy theorem - Physics ..

A change in the kinetic energy of an object is equal to

The total work done on a particle is equal to the change in its kinetic energy . 9519320 . 13.7k+ 274.7k+ 1:51 . In the formula , the term (E) represents translational kinetic energy per unit volume of gas. <br> In case of monoatomic gas, translational kinetic energy and total kinetic energy are equal. 10965932 (B) The kinetic energy of the electron remains consult (C) The momentum of the electron remains uniform rate. (D) The speed of the electron increases at a uniform rate. (1) The figure below shows a circuit and its impact voltage v 1 as friction of time 1 There is a strong connection between work and energy, in a sense that when there is a net force doing work on an object, the object's kinetic energy will change by an amount equal to the work done: Note that the work in this equation is the work done by the net force, rather than the work done by an individual force The work-energy relation states that the total work done on the particle is equal to its change in kinetic energy. When the brakes are applied the vehicle is traveling at the speed limit, with speed V; at the end of the skid its speed is zero. The change in kinetic energy is therefor

The Transfer of Kinetic Energy Principia Scientific Intl

Kinetic energy. When the net force acting on an object is zero, the net work done by all the forces acting on the object is zero. When the net force acting on an object is not zero, then the net work done on the object is W net = F net ·d.When a net force acts on an object, then the object accelerates, it changes its velocity if one or more external forces act upon a rigid object, causing its kinetic energy to change from to , then the work done by the net force is equal to the change in kinetic energy rotational kinetic energy the kinetic energy due to the rotation of an object. This is part of its total kinetic energy What change in kinetic energy does an 43000 kg airplane experience to takeoff if it moves a distance of 474.2 m by a constant net force of 4405. Question. Answered step-by-step. What change in kinetic energy does an 43000 kg airplane experience In classical mechanics, the equation for kinetic energy is [math]E = \dfrac{1}{2}mv^2.[/math] So, if we rearrange this for velocity, we get [math]v^2 = \dfrac{2E}{m}.[/math] Now, we only need to take the square root of the right hand side: [math]v.. where Q ˙ and W ˙ x are the energy transfer rates and m is the steady mass flow rate across the boundary (in and out), Δh is the change in specific enthalpy (h = u + pv), ΔV 2 /2 is the change in specific kinetic energy and Δgz is the change in specific potential energy

Kinetics, Thermodynamics & Equilibrium: Endothermic

The Physics Classroom » Concept Builders » Work and Energy » Energy Change What's Up (and Down) with KE and PE The What's Up (and Down) with KE and PE Concept Builder is a tool that challenges the learner to use an understanding of kinetic energy and gravitational potential energy in order to analyze a physical situation and to determine if. We can have energy in a system in two forms - it can be stored in the system (potential energy) and it can cause changes in the system (kinetic energy). Therefore, the key concepts to focus on within these sections are: potential and kinetic energy, systems, transfer of energy between parts of a system and the conservation of energy if one or more external forces act upon a rigid object, causing its kinetic energy to change from KE 1 KE 1 size 12{E rSub { size 8{k1} } } {} to KE 2 KE 2 size 12{E rSub { size 8{k2} } } {}, then the work W W size 12{W} {} done by the net force is equal to the change in kinetic energy rotational kinetic energy

Kineticparticletheory (002)

Kinetic Energy Calculato

LSS Kinetic Particle Theory

A: An object has potential energy (stored energy) when it is not in motion. Once a force has been applied or it begins to move the potential energy changes to kinetic energy (energy of motion). Posted on May 28, 2013 at 7:52 pm. Categories: Forces of Flight When a net amount of work is done, the kinetic energy K does change. Kinetic Energy: K=1/2 ⋅m⋅v^2. In other words, the change in kinetic energy is equal to the net work done on a system or an object. Wnet=ΔK. The above-mentioned formula is said to be the work-energy theorem and applies in a general sense Change in kinetic energy happens with momentum but they are not directly proportional.Here a problem is solved to understand the relation comprehensively.Ven..

* Q1: What is the change in the kinetic energy for Chegg

Changes in Kinetic Energy during Collisions - Page 3. Method Set up the apparatus as shown in the diagram. Measure the mass of the trolleys (m 1 and m 2).Click here to open a Sonic file. Position the track so that the velocity of the trolley remains constant in either direction if it does not collide with another trolley The process of ascent/descent continues to change between potential and kinetic energy throughout the duration of the ride. A Wind Turbine. Kinetic energy does not always have to convert back and forth between potential energy. Instead, it can also convert to numerous other forms of energy, including electrical energy. In the case of a wind.

Kinetic Energy . Kinetic Energy (KE) is amount of energy an object has due to motion. Kinetic Energy (KE) = 1/2Mass * Velocity ^ 2. By looking at the above formula we can see that the velocity of the object heavily influences the total KE the object will have. Comparing KE and PE . Now look at the PE and KE equations side by side. KE = 1/2Mass. Looked at in that way, the equation makes sense: the difference in pressure does work, which can be used to change the kinetic energy and/or the potential energy of the fluid. Pressure vs. speed. Bernoulli's equation has some surprising implications. For our first look at the equation, consider a fluid flowing through a horizontal pipe kinetic energy of a car change when its speed is tripled? a) no change at all b) factor of 3 c) factor of 6 d) factor of 9 e) factor of 12 Because the kinetic energy is mv2, if the speed increases by a factor of 3, then the KE will increase by a factor of 9. Question 7.5a Kinetic Energy The image above represents kinetic energy. To compute for the kinetic energy, two essential parameters are needed and these parameters are mass (m) and velocity (v). The formula for calculating the kinetic energy: K.E. = 0.5mv². Where; K.E. = Kinetic Energy m = Mass v = Velocity. Let's solve an example Kinetic energy is energy of motion. Objects that are moving, such as a roller coaster, have kinetic energy (KE). If a car crashes into a wall at 5 mph, it shouldn't do much damage to the car. But if it hits the wall at 40 mph, the car will most likely be totaled. Kinetic energy is similar to potential energy

II. Work-Kinetic Energy Theorem K K f K i W (7.4) Change in the kinetic energy of the particle = Net work done on the particle III. Work done by a constant force - Gravitational force: W F d mgdcos (7.5) Rising object: W= mgd cos180º = -mgd F g transfers mgd energy from the object's kinetic energy Kinetic energy of the tram: Ek = (mV ^ 2) / 2, where m is the mass of the tram, V is the speed of movement. Kinetic energy of a tram with a 2-fold increase in speed (V1 = 2V) If the ball were to fall, the potential energy would be transformed into kinetic energy until all of the potential energy was exhausted when the ball rested on the ground. Wrecking balls also swing like a pendulum; through the swing, there is a constant change of potential energy (highest at the top of the swing) to kinetic energy (highest at.

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Is work change in kinetic energy? - FindAnyAnswer

The kinetic energy of particles plus the energy of Thermal energy decreases as a substance is cooled. As thermal energy changes, the state of matter changes (Figure 3). thermal expansion an increase in the volume of a substance caused by heating Figure 3Changes in thermal energy can cause a change of state are converting energy from food into kinetic energy. The kinetic energy can be harnessed; much like some hydropower technologies harness water movement. A way to convert this kinetic energy into electric energy is through piezoelectricity. By applying a mechanical stress to a piezoelectric crystal or material a Rotational kinetic energy and angular momentum. 11-1-99 Sections 8.7 - 8.9 Rotational work and energy. Let's carry on madly working out equations applying to rotational motion by substituting the appropriate rotational variables into the straight-line motion equations

newtonian mechanics - Kinetic energy with respect to

Because energy is always conserved, a change in potential energy must be balanced out by a corresponding change in kinetic energy, so: Using these mathematical relationships, one can solve a whole host of problems related to the position, motion, and energy of a system Change in kinetic energy = ½ x 4 x (40 2 - 20 2) Change in kinetic energy = 2 x (1600- 400) = 2400 J. Ans: The change in kinetic energy of rotation is 2400 J. Example - 03: An energy of 500 J is spent to increase the speed of wheel from 60 r.p.m. to 240 r.pm. Calculate the moment of inertia of the wheel. Given: Change in kinetic energy. How to Measure Kinetic Energy The standard unit for kinetic energy is the joule (J). The joule is the standard unit for energy in general. Other units for energy include the newton-meter (Nm) and the kilogram meter squared over seconds squared (kg m 2 /s 2). Kinetic energy is a scalar quantity, which means it only has a magnitude and not a direction The change in kinetic energy is always equal to the total work, , and so, Since , the equation becomes, (if the elastic force is not the only force doing work) For springs, sometimes energy is lost to heating the metal or permanent deformations. These are some examples that could be described by a value Energy is found in different forms, such as light, heat, sound and motion. There are many forms of energy, but they can all be put into two categories: kinetic and potential. KINETIC ENERGY Kinetic energy is motion--of waves, electrons, atoms, molecules, substances, and objects. POTENTIAL ENERGY Potential energy is stored energy and th

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Calculating Changes in Kinetic & Potential Energy of a

The excess energy after overcoming the attraction force becomes kinetic energy of that electron. Thus, excess energy can only be applied to that particular electron, which absorbed the photon. As a result, if the E(photon) increases, the number of electrons being emitted will not increase, but the kinetic energy of those electrons will increase Acid Pix/CC-BY 2.0. Temperature is directly proportional to the average kinetic energy of the molecules in a substance. If the degree of motion of the molecules inside an object doubles, the temperature will also double. Temperature is used as a measure for heat in an object by measuring the amount of kinetic energy in the molecules that make.

Kinetic Energy and Wor

Kinetic energy is the energy of motion. An object that has motion - whether it is vertical or horizontal motion - has kinetic energy. There are many forms of kinetic energy - vibrational (the energy due to vibrational motion), rotational (the energy due to rotational motion), and translational (the energy due to motion from one location to another) Example: Proton's kinetic energy. A proton (m = 1.67 x 10-27 kg) travels at a speed v = 0.9900c = 2.968 x 10 8 m/s.What is its kinetic energy?. According to a classical calculation, which is not correct, we would obtain: K = 1/2mv 2 = ½ x (1.67 x 10-27 kg) x (2.968 x 10 8 m/s) 2 = 7.355 x 10-11 J. With relativistic correction the relativistic kinetic energy is equal to

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How does kinetic energy of a body change if its mass is

The change in the kinetic energy of the object as the speed changes is proportional to the square of the factor by which the speed changes. Similarly, if the speed of the object triples the kinetic energy becomes nine times the initial kinetic energy. Click to see full answer If the kinetic energy of a particle changes from some initial value K i to some final value K f the amount of work done on the particle is given by. W = K f - K i. This indicates that the change in the kinetic energy of a particle is equal to the total work done on that particle by all the forces that act on it

Kinetic energy - Wikipedi

Piezoelectric Energy In this article, I'll show you how to make a small, wallet-sized device that generates electricity from kinetic energy. The concept is simple: Piezoelectricity is the charge that is produced when certain solid materials (commonly ceramic and crystal) in response to mechanical stress. Piezoelectrics have many applications; in speakers, actuators, sensors, even fuses The kinetic energy of an object is the energy it has because of its motion. In Newtonian (classical) mechanics, which describes macroscopic objects moving at a small fraction of the speed of light.

If your car is out of gas, the motor will not crank and it will not move. The gasoline in the car provides energy to cause a change in the car. Watch the video Energy (3:33) to learn more about energy. DES information. In this lesson, you will learn about the following types of energy: Kinetic energy; Potential energy → Kinetic Energy and Mass for Very Fast Particles . Let's think about the kinetic energy of one of these particles traveling close to the speed of light. Recall that in an earlier lecture we found the kinetic energy of an ordinary non-relativistic (i.e. slow moving) mass m was 1 2 m v 2 Mechanical energy in a car crash could be summed up as follows: The car contains gasoline, which has energy stored as chemical potential energy. The engine burns gasoline and changes it into kinetic energy. This is transferred to the car's axles in the form of rotation, causing the wheels to turn and the car to move The change in kinetic energy of the system is. The change in the kinetic energy of the system is negative, and we conclude that mechanical energy is not conserved. The loss of mechanical energy is due to the work done by the friction force between the surface of the lazy Susan and the legs of the cockroach 4 Energy transformations in the pole vault by N.P. Linthorne Centre for Sports Medicine and Human Performance, School of Sport and Education, Brunel University, Uxbridge, United Kingdom Abstract This paper describes and explains the changes in kinetic energy, gravitational potential energy, elasticenergy, and muscularworkduring a pole vault.