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Question
Friction that exists between two surfaces in contact when there is no relative motion between them is known as ______.
Options:
A .  sliding friction
B .  rolling friction
C .  kinetic friction
D .  static friction
Answer: Option D
:
D
Friction that exists between two surfaces in contactwhen there is no relative motion between themis known as static friction.It is a self-adjusting force which has a maximum limit. When the applied force overcomes thismaximum value of static friction, the object starts moving. After this,kinetic or sliding friction comes into play.

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