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]
An object of mass $m$ rests on a rough surface. Another object of mass $M$ is connected to it with a rope.
The image below shows the free-body diagram of horizontal forces on the object of mass $m$.
Which of the following correctly describes the Newton's 3rd Law force paired with $F_2$?
A. The pull of mass $m$ upwards on the earth.
B. The upward contact force on the mass $m$.
C. The tension force to the right on the mass $m$.
D. The tension force to the right on the mass $m$.
参考答案: D
本题详细解析:
Explanation:
According to the given diagram, two horizontal forces are acting on the mass $m$. They are friction and tension. The force acting towards the left is friction. The friction occurs on the object due to sliding on the surface. Therefore, according to Newton's third law, the pair of the force must be on the surface and in the opposite direction. Therefore, the answer is D.
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