Theory of Machine
Kinematic pairs are those which have two elements that

Have surface contact
Have line contact
Are held together
Permit relative motion

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

The friction force is directly proportional to the normal force.
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.

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Theory of Machine
When the belt is stationary, it is subjected to some tension known as initial tension. The value of this tension is equal to the

Tension in the slack side of the belt
Tension in the tight side of the belt
Average tension of the tight side and slack side of the belt
Sum of the tensions on the tight side and slack side of the belt

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