Theory of Machine
The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because

Whole of the mechanism in the Ackerman steering gear is on the back of the front wheels
The Ackerman steering gear is most economical
Both (A) and (B)
The Ackerman steering gear consists of turning pairs

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

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