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#### Tea.bag

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##### Physics Experiments and Sacs
« on: March 14, 2008, 05:32:35 pm »
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hey guys,
i just wanted to how write a good report on an experiment for physics. Any help will be appreciated.
Bachelor of Engineering @ monash (clayton)

#### sammy_g

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##### Re: Physics Experiments and Sacs
« Reply #1 on: March 15, 2008, 12:43:44 pm »
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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

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##### Re: Physics Experiments and Sacs
« Reply #2 on: March 18, 2008, 04:17:35 pm »
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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
Bachelor of Engineering @ monash (clayton)

#### Mao

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##### Re: Physics Experiments and Sacs
« Reply #3 on: March 18, 2008, 06:04:36 pm »
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err, dan, the force is constant, gravity

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:

$I=\Delta P = Ft$
where force is constant, higher impulse (momentum) means longer time =D
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#### Tea.bag

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##### Re: Physics Experiments and Sacs
« Reply #4 on: March 18, 2008, 06:22:15 pm »
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but why is the bounce height less than the original height?
Bachelor of Engineering @ monash (clayton)

#### Collin Li

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##### Re: Physics Experiments and Sacs
« Reply #5 on: March 18, 2008, 06:42:37 pm »
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but why is the bounce height less than the original height?

It's not an elastic collision. You heard the ball bounce right? That's sound energy that was previously kinetic energy... and it's not going to be kinetic energy for the ball on the way up, now that it's gone to your ears.

There's also air resistance, and lots of other possible losses of energy (heat, light, etc.) although they are not all applicable in the case of a bouncing ball.

#### Mao

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##### Re: Physics Experiments and Sacs
« Reply #6 on: March 18, 2008, 06:58:07 pm »
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The earth also take away some of that energy, as the result of the collision earth also moves a bit (but very insignificant)

however, the mass of earth is so huge that the little velocity earth bounce away with makes up for the observable loss in kinetic energy/momentum
Editor for ATARNotes Chemistry study guides.

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#### Tea.bag

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##### Re: Physics Experiments and Sacs
« Reply #7 on: March 29, 2008, 05:34:40 pm »
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can someone explain to me about transistors and amplifiers. i dont get them at all...
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#### Mao

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##### Re: Physics Experiments and Sacs
« Reply #8 on: March 29, 2008, 05:55:34 pm »
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http://vcenotes.com/forum/index.php/topic,2172.0.html

hopefully that will sort out some confusions
Editor for ATARNotes Chemistry study guides.

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#### Tea.bag

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##### Re: Physics Experiments and Sacs
« Reply #9 on: March 31, 2008, 09:55:47 am »
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