Theory of Machine
Higher pairs are those which have

Two elements that permit relative motion
Point or line contact between the two elements when in motion
Surface contact between the two elements when in motion
Elements of pairs not held together mechanically

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Theory of Machine
Which of the following statements regarding laws governing the friction between dry surfaces are correct?

All of these
The friction force is independent of me area of contact.
The friction force is dependent on the materials of the contact surfaces.
The friction force is directly proportional to the normal force.

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