# Physics Essay

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Physics Essay January 20, 2010
Experiment vs. Observation
-Experiment: an operation or procedure carried out under controlled conditions in order to discover an unknown effect or law, to test or establish a hypothesis, or to illustrate a known law
-Observation: an act of recognizing and noting a fact or occurrence often involving measurement with instruments
-Measurments: Needs units, cm, inches, degrees etc. Reasons for different units of measurements are 1) practical application and 2) cultural differences
-------------------------------------------------------------------------------------------------------------------------------------------------
Experiment 1
------------------------------------------------------------------------------------------------------------------------------------------

Height=X
Height=X

In an ideal experiment: The ball rolls to the other side to the exact same height from which it was dropped from. In a real experiment: Forces of friction and gravity act on the ball so it rolls just short of the same height.

In an ideal experiment: Ball rolls infinitely

In a real experiment: Once again, forces of gravity and friction act on the ball to slow it.
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Experiment 2

Cup has 0 net force. No gravity, No friction. An object with 0 net force will keep moving forever. Newton’s first law: Fnet=0 => V= constant or a=0 (velocity is constant, & acceleration is zero) ------------------------------------------------------------------------------------------------------------------------------------------Experiment 3 Question: Which string will break first? Top or bottom?
Answer: Depends on how fast the force is applied.

Reason: A massive object is harder to

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