Energy Of Toys - Lab 5 Conclusion PDF

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Lab 5 Conclusion...

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Toy Lab Conclusion For the first challenge we were asked to find the elastic potential energy in a loaded popper. For toy 1, to get things rolling we used the equation Ei + W = Ef. In this scenario the Initial energy would be the elastic energy as it was compressed, the work would have been zero because no energy is transferred into or out of the system, and the Final energy would have to be gravitational potential energy because there was a change in height. So now our equation be US + W = Ug (or Us = Ug). Since we knew that UG = Us, we could imply that mgh = Us. Since mass was already given (m = .013kg) and g was already given (g = 9.8 m/s2) all we needed to find was the height. To find the height we used a meter stick to measure the height in the air and the height equaled 1.49 meters. After we multiplied mgh we got .189 J. That was the elastic potential energy. For toy 1 we had to ignore air resistance, energy transferred to the table, and the energy transferred to the air to make sound because we did not know how to solve for those energies. As a result, the final energy would be less than the initial energy.

For the second challenge we were asked to find the velocity of the car? For toy 2, we start the same way with beginning the problem with equation Ei + W = Ef. In this scenario there was no initial energy, however there was work because energy was transferred into the system, and the final energy was kinetic energy because the object is in motion. So 0 + W = K ( or W = K). Remember the work in this problem is frictional force. Frictional force = µK * FN (m*g). So now the equation looked like 1/2 * m * v2 = µK * mg * X. The masses cancel out, we were given the µ (.15) and we found the X (.76). After using our math skills the velocity we got was 1.51 m/s. For this toy we had to ignore air resistance and the energy transferred to sound because we have not learned how to solve for those energies. As a result, the final energy would be less than the initial energy....