SAT Subject Physics Practice Question 397: Answer and Explanation
3. The catcher prepares to receive a pitch from the pitcher. As the ball reaches and makes contact with his glove, the catcher pulls his hand backward. This action reduces the impact of the ball on the catcher's hand because
A. the energy absorbed by his hand is reduced.
B. the momentum of the pitch is reduced.
C. the time of impact is increased.
D. the time of impact is reduced.
E. the force exerted on his hand remains the same.
Correct Answer: C
The correct answer is (C). The momentum of the pitched ball is changed by the impulse Ft. The catcher reduces the magnitude of the force on his hand by increasing the time required to change the momentum of the ball.