Extended essay?

Question

Here is my topic on physics: Study the energy change as a tennis ball rebounds from different surfaces.

Methods that i though of: Calculating Coefficient of Restitution, Energy lost as it rebounds, Coefficient of Friction.

Any ideas on this topic.....please i really need help on it

thanks

Answer 1

any time the ball impacts on a surface, it loses energy due to friction, eventually resulting in the ball coming to a rest.

You might explore the relationship between Kinetic energy and Potential energy, both of which change as the ball changes elevation.

Kinetic energy, represented by the equation Ke = 1/2 M * V^2 where M is the mass of the object and V is its velocity, is a measure of the energy involved in the object's motion.

Potential energy, represented by the equation Pe = M * G * H where M is the mass, G is the acceleration due to gravity, and H is the height above an arbitrary zero point (usually set at ground level), measures how much energy is stored inside the object due to gravity.

AS an object falls, like a dropped tennis ball, it loses potential energy and gains kinetic energy. WHen the ball bounces back up it gains potential energy and kinetic energy. In a perfect system with no friction, Pe + Ke at any given time would remain a constant number. In reality, a little energy is lost due to friction.

Answer 2

Start your essay by describing what happens when the ball hits a hard perpendicular surface and bounces. Will the rebound speed ever be greater than the impact speed? How much less? Why? Now switch to other kinds of surfaces and tell what changes. Now vary the angle of incidence and tell what happens.

You can write the essay without knowing or understanding what happens. Just write what you think might happen. Be clear when you are citing facts and when you are expressing theory.

Make it quantitative everywhere you can. Weigh a ball, calculate its impact velocity and kinetic energy. Measure its bounce and calculate exactly how much energy was lost. Measure it at least on concrete and carpet.

You can get a lot of benefit from this exercise, even without spending a lot of time or money on it. Use a yardstick and whatever ball you happen to have. And have fun!

Answer 3

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Answer 4

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