The county fair has a game that supposedly measures your strength. When you pound on one end of a lever with a giant hammer, the lever tosses a metal ball up a tall, vertical track toward a bell located 10 meters above you (see Figure E). You decide to give it a try and, to your delight, manage to hit the bell on the first try. As the ball rises upward on the frictionless track, it experiences
A. a constant upward force that depends only on the momentum of the ball as it rises toward the bell.
B. an upward force that decreases steadily but yet remains substantially greater than zero even when the ball hits the bell.
C. an upward force that decreases steadily and reaches zero exactly at the moment the ball hits the bell.
D. no upward forces.
Answer:D
The county fair has a game that supposedly measures your strength. When you pound on one end of a lever with a giant hammer, the lever tosses a metal ball up a tall, vertical track toward a bell located 10 meters above you (see Figure E). You decide to give it a try and, to your delight, manage to hit the bell on the first try. As the ball rises upward on the frictionless track, it experiences
A. a constant upward force that depends only on the momentum of the ball as it rises toward the bell. B. an upward force that decreases steadily but yet remains substantially greater than zero even when the ball hits the bell. C. an upward force that decreases steadily and reaches zero exactly at the moment the ball hits the bell. D. no upward forces.