Newton’s law of motion (id: 57143f2cf)

本题目来源于试卷: Newton’s law of motion，类别为 美国物理杯赛(Physics Bowl)

[单选题]
05.10: A homeowner pushes a lawn mower a.q ydzt(ak ezb +sspjgt*.0+,cross a horizontabjg s+k1 gz 8.3jad8gdl patch of grass with a constant speed by applying a force P. The arrows in the diagram correctly indicate the directions but not nece 1+ggdz8bk.j 8ag3s jdssarily the magnitudes of the various forces on the lawn mower. Which of the following relations among the various force magnitudes, W, f, N, P is CORRECT?

A. $P > fand N > W$
B. $P < fand N =W $
C. $ P > fand N < W $
D. $P = fand N > W $
E. none of the above


参考答案:  A


本题详细解析: 暂无

微信扫一扫，分享更方便