Engineering Mechanics

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

A. W
B. W sin (a + $)
C. Wtan(a + <|))
D. Wan(a-)
E. Wtana

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

A. 3t2-lt
B. 3t2+2t
C. 6f-8
D. 6f-4
E. 6t2-8t

A. 0°
B. 30°
C. 45°
D. 60°
E. 90°.

A. bodies having relative motion
B. two dry surfaces
C. two lubricated surfaces
D. solids and liquids
E. electrically charged particles

A. limiting friction
B. sliding friction
C. rolling friction
D. kinematic friction
E. dynamic friction

A. balance each other
B. cannot balance each other
C. produce moment of a couple
D. are equivalent
E. none of the above

A. nature of surfaces
B. area of contact
C. shape of the surfaces
D. ail of the above.
E. A. and B. above

A. j-2
B. 2j-l
C. 2/-3
D. 3/-2
E. 2/ -4