Theory of Machine
A system of masses rotating in different parallel planes is in dynamic balance if the

Resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero
Resultant force and resultant couple are both equal to zero
Resultant force is equal to zero
Resultant couple is equal to zero

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Theory of Machine
Inertia force acts

Perpendicular to the acceleration force
Opposite to the direction of acceleration force
Along the direction of acceleration force
None of the listed here

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

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