Microquiz_2 - ConcepTest ConcepTest 3.4a 3.4a Firing Balls...

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Unformatted text preview: ConcepTest ConcepTest 3.4a 3.4a Firing Balls I Firing Balls I A small cart is rolling at constant velocity on a flat track. It fires a ball straight up into the air as it moves. After it is fired, what happens to the ball? 1) it depends on how fast the cart is 1) it depends on how fast the cart is moving moving 2) it falls behind the cart 2) it falls behind the cart 3) it falls in front of the cart 3) it falls in front of the cart 4) it falls right back into the cart 4) it falls right back into the cart 5) it remains at rest 5) it remains at rest ConcepTest ConcepTest 3.4a 3.4a Firing Balls I Firing Balls I A small cart is rolling at constant velocity on a flat track. It fires a ball straight up into the air as it moves. After it is fired, what happens to the ball? 1) it depends on how fast the cart is 1) it depends on how fast the cart is moving moving 2) it falls behind the cart 2) it falls behind the cart 3) it falls in front of the cart 3) it falls in front of the cart 4) it falls right back into the cart 4) it falls right back into the cart 5) it remains at rest 5) it remains at rest when viewed from train when viewed from ground In the frame of reference of the cart, the ball only has a vertical vertical component of velocity. So it goes up and comes back down. To a ground observer, both the cart and the ball have the same horizontal velocity same horizontal velocity , so the ball still returns into the cart. Now the cart is being pulled along a horizontal track by an external force (a weight hanging over the table edge) and accelerating. It fires a ball straight out of the cannon as it moves. After it is fired, what happens to the ball? 1) it depends upon how much the track is tilted 2) it falls behind the cart 3) it falls in front of the cart 4) it falls right back into the cart 5) it remains at rest ConcepTest ConcepTest 3.4b 3.4b Firing Balls II Firing Balls II Now the cart is being pulled along a horizontal track by an external force (a weight hanging over the table edge) and accelerating. It fires a ball straight out of the cannon as it moves. After it is fired, what happens to the ball?...
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This note was uploaded on 05/13/2010 for the course PHYSICS 53L taught by Professor Mueller during the Fall '07 term at Duke.

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Microquiz_2 - ConcepTest ConcepTest 3.4a 3.4a Firing Balls...

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