Theory of Machine
When the elements of a pair are kept in contact by the action of external forces, the pair is said to be a

Force-closed pair
Higher pair
Self-closed pair
Lower pair

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Theory of Machine
Hammer blow

Varies inversely with the square of the speed
Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses
Varies as the square root of the speed
Is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses.

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

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