More silly physics fun

[swede123]

Here's what will happen in your scenario.



Swede

[asofel]

why is he cumming out of his hand?

[Freakin]

This seems really simple. You throw a ball towards the wall, you move away from the wall. Am I missing something? The balls being elastic doesn't matter. If you were to catch the balls when they bounced off the wall, you would have additional force moving you away from teh wall

[codewarrior]

What do you mean? An African or European swallow?

[Senor Cardgage]

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This seems really simple. You throw a ball towards the wall, you move away from the wall. Am I missing something? The balls being elastic doesn't matter. If you were to catch the balls when they bounced off the wall, you would have additional force moving you away from teh wall

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The wall is attached to the cart.

[slickpoppa]

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Edit:In the brief time between when you release the ball and when the ball hits the wall, you travel in the -x direction.

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scratch what i just said

[mmbt0ne]

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Edit:In the brief time between when you release the ball and when the ball hits the wall, you travel in the -x direction.

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Thats not true, unless you are standing on roller skates or something. When you throw the ball in the +x direction you do not have any momentum in the -x direction because that momentum is absorbed by the friction between your feet and whatever you are standing on.

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You're close, but you need to take one more step to get there. [img]/images/graemlins/smile.gif[/img]

[MrWookie47]

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Edit:In the brief time between when you release the ball and when the ball hits the wall, you travel in the -x direction.

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Thats not true, unless you are standing on roller skates or something. When you throw the ball in the +x direction you do not have any momentum in the -x direction because that momentum is absorbed by the friction between your feet and whatever you are standing on.

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I believe we're standing on the cart, and said cart has perfect bearings. So, yes, we do move.

[goofball]

When I first read the question I understood it to be the cart is next to the wall but seperate from it. You also make it unclear whether or not we catch the balls after we throw them. This leaves 4 cases.

Case 1: Detached wall, we don't catch the balls

As you threw the balls off you and the card would move in the opposite direction under the laws of conservation of momentum. You would gain speed m(ball)/m(cart)*vball for each ball.

Case 2: Detached wall, catching the ball.

You would gain the above velocity each time you threw a ball, and again each time you caught one.

Case 3 Attached wall, not catching the ball.

You would move opposite the direction if your initial throws. The ball bounces off the wall and heads off in the other direction, behinid you. You will move opposite the final motioni of the ball.

Case 4 Attached wall, catching the ball

After you do everything you will be again sitting on the cart with a bunch of motinoless balls. You must also be motionless.

[CrazyEyez]

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Edit:In the brief time between when you release the ball and when the ball hits the wall, you travel in the -x direction.

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Thats not true, unless you are standing on roller skates or something. When you throw the ball in the +x direction you do not have any momentum in the -x direction because that momentum is absorbed by the friction between your feet and whatever you are standing on.

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You're close, but you need to take one more step to get there. [img]/images/graemlins/smile.gif[/img]

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Friction keeps your feet from moving on the board but that energy is transferred down to the wheels and, since perfect bearings, the board moves backward. (Then it stops when the ball hits the wall.)
Right?