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Physics Experiments and Sacs

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Tea.bag:
hey guys,
i just wanted to how write a good report on an experiment for physics. Any help will be appreciated.

sammy_g:
Hey i couldn't be bothered writing it all out but our teacher gave us this:

[IMG]http://img246.imageshack.us/img246/3773/physicspracreporths6.th.jpg[/img]

Tea.bag:
thanks alot. Now i know how to write a decent prac report..

hey can any of you smart people explain to me...

If we drop a ball from different heights. why does the impact time with the ground increase?
Explain in terms of physics

Mao:
err, dan, the force is constant, gravity :P

what happens is, the kinetic energy is larger when dropped from higher height, meaning a higher momentum.

The higher momentum means a higher impulse (change in momentum)

But the normal reaction force is equal and opposite of gravity, and hence is also constant

therefore according to the impulse equation:


where force is constant, higher impulse (momentum) means longer time =D

Tea.bag:
but why is the bounce height less than the original height?

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