581. The co-efficient of friction depends upon_______________?
A. nature of surfaces
B. area of contact
C. shape of the surfaces
D. ail of the above.
E. A. and B. above

582. If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either
A.Meet in a point
B.Be all parallel
C.At least two of them must meet
D.All the above are correct

583. The maximum frictional force which comes into play when a body just begins to slide over another surface is called__________________?
A. limiting friction
B. sliding friction
C. rolling friction
D. kinematic friction
E. dynamic friction

585. Tangent of angle of friction is equal to
A.Kinetic friction
B.Limiting friction
C.Angle of repose
D.Coefficient of friction

586. A projectile is fired at an angle 9 to the vertical. Its horizontal range will be maximum when 9 is_______________?
A. 0°
B. 30°
C. 45°
D. 60°
E. 90°.

587. A particle moves along a straight line such that distance (x) traversed in t seconds is given by x = t2 (t – 4), the acceleration of the particle will be given by the equation __________________?
A. 3t2-lt
B. 3t2+2t
C. 6f-8
D. 6f-4
E. 6t2-8t

588. If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella___________________?
A. more inclined when moving
B. less inclined when moving
C. more inclined when standing
D. less inclined when standing
E. none of the above

590. Coefficient of friction is the_________________?
A. angle between normal reaction and the resultant of normal reaction and the limiting friction
B. ratio of limiting friction and normal reaction
C. the friction force acting when the body is just about to move
D. the friction force acting when the body is in motion
E. tangent of angle of repose

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