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# physicslab5 - Physics 215 Lab 5 Conservation of Energy...

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Physics 215 March 05, 2010 Lab 5 Conservation of Energy Tamara Tamas Section 2 Partners: Wendy Tyson Melissa Frentz

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Introduction This experiments purpose is to prove that law by showing that energy is conserved from the gravitation field that is near the surface of the Earth. An airtrack was used with 2 Photogates attached to opposite ends with a cart that rolls between. The velocity and time was measured on four separate runs by a program called Data Studio. After taking the kinetic and potential energy into effect the net energy should be one. Theory The law of conservation of energy states that the total amount of energy in the universe remains constant. This means that energy can change forms but can not be created nor destroyed. The energy measured is kinetic and potential. Kinetic energy is the energy the object has due to motion. Potential energy is the energy the object has that can change the other objects around it. The net energy should come out equal after the kinetic and potential is applied. The total initial energy is a product of the initial kinetic and potential energies. Ill ustration 1: The energies at the different parts of the track
K=(1/2)mv 2 Procedure In the initial setup the length of the cart tab was measured along with its mass. The height of block for the shallow slope was then measured. The distance between legs and the between the light beams was measured. The height of the upper light beam above lower was calculated by multiplying the height of the blocks by the distance between light beams and then divided by the distance between the legs. The airtrack is setup with two photogates attached to each end of the track. The distance between the legs of the cart is 180 cm and the distance between the light beams is 130 cm. The cart gets released and the photogates time the velocity and acceleration between. A program called Data Studio records the results.

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From those results the velocity was calculated by taking the distance between the light beams in meters and dividing it by time in seconds. Velocity=(meters/seconds) After the velocity was found the results are used to find the kinetic energy at the upper level by multiplying (½) by the mass of the cart and the velocity squared. (½) MV 2 Potential energy is then calculated by taking the mass of the cart in kg multiplied by the gravity and then again multiplied by height in meters.To find the final energy/initial energy the energy of the lower level of kinetic energy is divided by the sum of the upper kinetic energy level and upper level of potential energy. The results are shown in the table below.
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physicslab5 - Physics 215 Lab 5 Conservation of Energy...

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