Why does an object have the friction force and what is the direction of the force?单项选择题

题目图片
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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