Which of the following statements is not true about the friction force?
Question
Which of the following statements is not true about the friction force?
Options
A)
Friction always act in such a direction that opposes motion
B)
The limiting frictional force is dependent on the area of contact of the two surfaces
C)
until motion takes place, the frictionally force is always equal to the force tending to produce the motion
D)
when motion takes place, the friction force is less than its limiting value.
The correct answer is D.
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