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Old April 1st, 2004, 05:52 PM   #1 (permalink)
 
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Physics!!!! Ahhh

well....im a fiziks nub and need some help here with this gay stuff
coodnt find the HW help sticky....so

1) a ball is rolled across a table and slowly comes to a stop.
Use Newtons 1st law of motion to explain why the ball stops.

2) a package on the seat of a bus slides backwards when the bus accelerates from rest quickly. It slides forwards when the driver brakes. Why and Why? (prolly use newtons agin)

3) A car is in an accident and struck from behind. people get whiplash from this.

a) use newtons laws to expalin what happens.
b) how does a headrest reduce whiplash
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Old April 1st, 2004, 05:53 PM   #2 (permalink)
 
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Newtons laws are just the basics, if you have ur book w/ you the definition is probably only a few sentences long, so look that up for the fastest way but if u give me a sec, Ill help ya out...
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Old April 1st, 2004, 05:56 PM   #3 (permalink)
 
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ya...its like reel basics.....but i cant relate it to newtons law and why...i dont even understand what a unblances force is
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Old April 1st, 2004, 05:57 PM   #4 (permalink)
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Re: Physics!!!! Ahhh

Quote:
Originally posted by sideshowbob
well....im a fiziks nub and need some help here with this gay stuff
coodnt find the HW help sticky....so

1) a ball is rolled across a table and slowly comes to a stop.
Use Newtons 1st law of motion to explain why the ball stops.

2) a package on the seat of a bus slides backwards when the bus accelerates from rest quickly. It slides forwards when the driver brakes. Why and Why? (prolly use newtons agin) thats all we usin

3) A car is in an accident and struck from behind. people get whiplash from this.
No offense, but I'm not in Physics and I can explain most of this...You sleeping in class?

1.)Friction causes the ball to slow down. An object in motion tends to stay in motion unless acted upon by an outside force. Or whatever it is. The outside force is friction.

2.)Uh, probably the same thing as above, but not so much friction. The object tends to stay at rest, unless acted upon by an outside force. The package wants to stay where it is, but the outside force of the bus accelerating has the package slide backward...or something...erm...yeah

3.)Yeah, people get whiplash because the energy/force of the one car is transfered quickly to the other one's back end, causing the 2nd car to lurch forward quickly. The driver & passengers want to stay at rest, but the car moves forward...So their necks & heads go snap. Er....yup..I think

If I'm wrong, well...I hope I helped a bit at least.

-Jin
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Old April 1st, 2004, 06:00 PM   #5 (permalink)
 
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Oh Btw, Jin answered but here are the three laws(if memory serves correct)

1. An object in motion will stay in motion unless acted upon by an outside force...I think this is Inertia or w/e

2. An object at rest will stay at rest unless acted upon by an outside force.

3. For every action their is an equal and oppostie reaction(Example: Two people on roller skates, if you push off eachother one will go one way, and the other, the other way)
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Old April 1st, 2004, 06:02 PM   #6 (permalink)
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Quote:
Originally posted by CrazyWeasel
3. For every action their is an equal and oppostie reaction(Example: Two people on roller skates, if you push off eachother one will go one way, and the other, the other way)
Yeah, that was what I was trying to say/think of...That can be applied to the last one...And probably number 2 as well.

-Jin
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Old April 1st, 2004, 06:05 PM   #7 (permalink)
 
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ya....that helps a bit....i jus cooded explain the law....i didnt get it
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Old April 1st, 2004, 06:36 PM   #8 (permalink)
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first law of motion an object in motion will remain in motion at a constant velocity untill acted upon by an unbalanced force
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Old April 3rd, 2004, 02:03 PM   #9 (permalink)
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Wow, pay attention in class. That stuff is like 6th grade physics.



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Old April 3rd, 2004, 02:22 PM   #10 (permalink)
 
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the first is definatively friction but thats all im sure about Jins answer seems right
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Old April 3rd, 2004, 02:31 PM   #11 (permalink)
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Re: Physics!!!! Ahhh

Quote:
Originally posted by sideshowbob
well....im a fiziks nub and need some help here with this gay stuff
coodnt find the HW help sticky....so

1) a ball is rolled across a table and slowly comes to a stop.
Use Newtons 1st law of motion to explain why the ball stops.

2) a package on the seat of a bus slides backwards when the bus accelerates from rest quickly. It slides forwards when the driver brakes. Why and Why? (prolly use newtons agin)

3) A car is in an accident and struck from behind. people get whiplash from this.

a) use newtons laws to expalin what happens.
b) how does a headrest reduce whiplash
1. friction
2. inertia
3. same as 2
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