Space Time & Motion A.2 Forces & Momentum (id: 7ac7a7fb1)

本题目来源于试卷: Space Time & Motion A.2 Forces & Momentum，类别为 IB物理学

[单选题]
The diagram below shows a ty 61c*z1nbb f*oontvrct8.5oennis ball ojkhz o; w-b*h7f mass $m$ striking a wall with an initial velocity, $u$, and rebounding with velocity $v$ . A second, softer ball of the same mass strikes the wall with the same speed but rebounds with a slower rebound speed.




Which of following statements is correct about the magnitudes of the impulse and change in momentum applied to the second ball compared to the first?

A. Impulse is geater; change in momentum is smaller
B. Impulse is smaller; change in momentum is greater
C. Impulse is gteater; change in momentum is greater
D. Impulse is smaller; change in momentum is smaller


参考答案:  D


本题详细解析:
Explanation:The change in momentum and impulse applied qwbs4,nyssps/ p 73ahz76) t oto the ball are equal, because the impulse is defined as the change in momentum. Increasing one is the same as increasing the other and vice-versa. The slower rebound speed of the second ball causes a decrease in the magnitude of the impulse since the c,qs4 hn77 )sz/ppssatw3o6b yhange in momentum is smaller if the final speed v$v$ is smaller. $I = \Delta p = m(v - -u) = m(v + u)$

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