第五章单元测试
- 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 
. （ ） - 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. （ ） - According to Newton’s first law, in which of the following motions, the net force acting on the particle is zero. （ ）。
- According to Newton’s third law, which of the following statements about action-reaction force pairs are correct. （ ）
- Newton’s laws can be applied to both inertial and non-inertial frames. （ ）
A:
B:
C:
D:
答案:
A:
B:
C:
D:
A:The particle is at rest B:The particle moves with a constant velocity C:The particle moves with a constant speed D:The particle moves with a constant acceleration
A:They have the same magnitude and same direction B:They must act on two different objects C:They have the same magnitude but opposite direction D:They can act on the same object
A:对 B:错
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