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Once you push off from the highest point of that hill gravity takes you the rest of the way down to where you will be stopping...

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Riding a bike down a hill is comparable to which type of process?

Turning potential energy into kinetic energy. As you ride down the hill the potential energy you stored in your mass on the way up is converted into kinetic energy. That's why you speed up as you go down a hill and also why it's harder to go uphill.


What happens to energy of the skier if he goes down a hill?

The potential energy of the skier is converted into kinetic energy as they go down the hill due to gravity. This kinetic energy allows the skier to move faster and pick up speed.


Do marbles go further down a hill if the hill is steeper?

Yes, sometimes and no sometimes. In the case of rotating objects the more import value is moment of inertia. An object with a higher moment of inertia will accelerate slower (roll slower comparatively for any given time after release) down an inclined plane. In the case where the marbles are of equal diameter and uniform (although different if one is to have more mass) density the heavier marble will roll slower down a slope. For those interested in a short description followed by plenty of calculus. http://en.wikipedia.org/wiki/Moment_of_inertia


Does momentum make a bike move down a hill?

Momentum is the product of mass and velocity which infers motion taking place. If the bike was moving then yes it would make it go downhill. The real culprit would be gravity if the bike was not already in motion. The hill is an incline and the bike is being pulled by gravity down that incline.


Why do your ears pop when you are going down a hill?

When you go down a hill, the change in altitude can cause a difference in air pressure between the inside of your ear and the outside environment. This pressure difference can cause the Eustachian tube in your ear to open and close rapidly, equalizing the pressure and causing the popping sensation.