College Physics答案2023

第五章测试

1.A 2-kg block sits on a rough ground. If pushed by a 10 N force, it will move with an acceleration 2 . What is the coefficient of kinetic friction . （ ）
A: B: C: D:
答案:A
2.Two particles with mass and can be accelerated by a constant 10-N force, If no other forces and the ratio of their accelerations are 2:1, what is the ratio of their masses. （ ）
A: B: C: D: 3.According to Newton’s first law, in which of the following motions, the net force acting on the particle is zero. （ ）。
A:The particle moves with a constant acceleration B:The particle moves with a constant velocity C:The particle moves with a constant speed D:The particle is at rest 4.According to Newton’s third law, which of the following statements about action-reaction force pairs are correct. （ ）
A:They have the same magnitude and same direction B:They have the same magnitude but opposite direction C:They must act on two different objects D:They can act on the same object 5.Newton’s laws can be applied to both inertial and non-inertial frames. （ ）
A:错 B:对