本题目来源于试卷: newnewnewnew，类别为 IB物理学
[问答题]
When a golf ball is dropi7p tgq+hj5n.*2 *8wjfszpm lped to the pavement, it bounces back up. (a) Is av-yj8 hm9x(tbzqg .g; force needed to make it bounce back up? (b) If so, what exerts the fbh;qm v 9jxgyg(8-.t zorce?
参考答案: (a) A force is needed to bounce the ball back up, because the ball changes direction, and so accelerates. If the ball accelerates, there must be a force. (b) The pavement exerts the force on the golf ball.
本题详细解析:
暂无
| 
