Engineering Mechanics Questions And Answers.

1.The friction experienced by a body, when in motion, is known as
A. rolling friction
B. dynamic friction
C. limiting friction
D. static friction

2.Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the ball with velocity v is made to struck the second ball. Both the balls after impact will move with a velocity
A. v
B. v/2
C. v/4
D. v/8

3.The velocity ratio in case of an inclined plane inclined at angle θ to the horizontal and weight being pulled up the inclined plane by vertical effort is
A. sin θ
B. cos θ
C. tan θ
D. cosec θ

4.The range of projectile on a downward inclined plane is __________ the range on upward inclined plane for the same velocity of projection and angle of projection.
A. less than
B. more than
C. equal to
D. none of above

5. A body of weight W is required to move up on rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by(where μ = tanφ = Coefficient of friction between the plane and the body.)
A. P = W tanα
B. P = W tan(α + φ)
C. P = W (sinα + μcosα)
D. P = W (cosα + μsinα)

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