Why might there be a slight downslope in the total energy instead of a flat constant?

2. After calculating kinetic energy of the string and pulley, what are some other “sources”of energy that we did not account for? List two.

3. In terms of energy, why is it easier to go down a hill on a bike than it is to go up a hill?Why do we need to keep pedaling when we are on flat ground to keep a constant velocity?

4. Wiki question: Because of a variety of reasons, the value for gravitational acceleration,g, on Earth varies depending on where you are on the surface. Look up “Gravity ofEarth” on Wikipedia. Find the table under the “Comparative gravities in various cities around the world” section. In which city listed would the velocity in this experiment be the greatest? The least? (Use the value under “Quoted value.”)

5. List two reasons why you think this variation in g exists.

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