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First you need to know the forces of energy:

elastic force (the potential to be stretched or compressed)

normal force (opposite the force of gravity, which is -10Newtons)

force of friction (force needed to move an item accross a surface)

You also need to know some energies in general:

Potential energy ("stored" energy - energy not being readily used)

Elastic potential energy (the potential for an item to have an elastic force)

kinetic energy (energy built up from moving. Faster = more kinetic energy, vice versa)

gravitational energy (The pull of gravity, which is -10N on Earth)

energy dissipated (energy lost through heat, sound, vibration, light, or contact with another object)

When the ball is held in the air (100% potential energy, since its not moving), or is falling (100% kinetic energy), it has a constant normal force of 10 newtons, while succumbing to earths gravitational pull of -9.8 (10) Newtons. once the ball hits the ground the first time, its kinetic energy (or energy gained from falling [moving]) is converted in elastic potential energy, because it is smacking into the ground and compressing. The ratio for this would be about 75% kinetic energy and 25% elastic potential energy. this means that 25% of the energy used to move the ball has been lost and absorbed by the floor in energy dissipation. Since the ball is always opposite the force of gravity, it must return to its original shape (sphere), so it uncompresses, thus causing it to bounce back up into the air. However, since it is closer to earth and has lost 25% of its energy, it will never go as high as it was released from (unless you intentionally throw it at the ground, but this would give it an additional downward force, causing it to rebound with more energy). Since energy was lost, the ball now has 50% kinetic energy and 50% gravitational energy (because it is not squishing in mid-air). when it hits the ground a second time, it will lose another 25%, and another 25%, and another 25%. If earth had perfect gravity and the world had no friction, the ball would literally bounce forever, but it would soon look like its standing still since we cannot see things on a nano-scale.

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12y ago

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