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Physics Lab write up 10

# The tendency of a body to maintain its state of rest

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the tendency of a body to maintain its state of rest or uniform motion unless acted upon by an external force ( wordnetweb.princeton.edu/perl/webwn ) Translational kinetic energy : The kinetic energy of an object is the energy which it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its current velocity. . ..( en.wikipedia.org/wiki/Translational_kinetic_energy ) Rotational energy : The kinetic energy of a rotating rigid body otherwise at rest ( en.wiktionary.org/wiki/rotational_energy ) Translational energy : The kinetic energy of an object is the energy which it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its current velocity. ( en.wikipedia.org/wiki/Translational_energy ) Data: (look at attached excel sheet) Analysis: (look at attached excel sheet) Results and Conclusion: This lab was executed to help the students know and understand how this experiment provides a method for checking the conservation of energy principle which states that changes in potential energy of the falling mass and the kinetic energy by finding the kinetic energy of a rotating disk and falling mass. Possible discrepancies in our data would be not accounting for friction or the energy lost to sound, wrong calculations, rushing through the experiment too fast, not starting at the same initial spot every time, and not stopping the data collecting when the weight hanger starts to come back up after its first big initial drop. In our experiment the percent differences were over a hundred (130%-150%), which could

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be, because we did not account for friction or the energy lost to sound and heat but our percent differences increases slowly as the weight of the falling mass increases. For example at 0.025 kg we had a percent difference of about 130% while at .125 kg we had a percent difference of roughly around 150%. Questions: 1. Is energy conserved? Answer: According to our data results, the energy is not conserved. 2. What are the potential sources of error (percentage difference)? Answer : Potential sources for this error could be the fact that we did not account for friction or the energy lost to sound and heat 3. Does the percent difference vary with the value of the falling mass? Answer: The percent difference slowly increases as the falling mass is increased. 4. Why does the percent difference vary, or not vary with the value of the falling mass? Answer: The reason for this variation between percent differences is that as the mass is increased, there is more energy lost to friction and heat and sound that was not accounted for.
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