题目
UCIC 202503 PHYS101 Quiz 2
单项选择题
Why does an object have the friction force and what is the direction of the force?
选项
A.a. Because there is a friction between the object and the surface, direction of the force is opposite to the motion
B.b. Because it sits on a surface or other object, direction of the force is perpendicular to the surface
C.c. Because it is tied to a string, direction of the force is along the string but away from the object
D.d. Because it has the mass, direction of the force is downward
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标准答案
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思路分析
To tackle this question, I will assess each option in turn and explain the underlying physics.
Option a: 'Because there is a friction between the object and the surface, direction of the force is opposite to the motion.' This reflects the standard idea that kinetic friction acts to oppose relative motion between surfaces. The friction force arises due to intermolecular interactions at the contact surfac......Login to view full explanation登录即可查看完整答案
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