Theory of Machine
Length of arc of contact is given by

Arc of approach - Arc of recess
Arc of approach × Arc of recess
Arc of approach / Arc of recess
Arc of approach + Arc of recess

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

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Theory of Machine
The maximum fluctuation of speed is the

Sum of maximum and minimum speeds
Variations of speed above and below the mean resisting torque line
Difference of the maximum and minimum speeds
Difference of minimum fluctuation of speed and the mean speed

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