A. nature of surfaces
B., area of contact
C. shape of the surfaces
D. ail of the above.
E. A. and B. above
Related Mcqs:
- Effect of a force on a body depends upon________________?
A. magnitude
B. direction
C. position or line of action
D. all of the above
E. none of the above - Dynamic friction as compared to static friction is________________?
A. same
B. more
C. less
D. may be less of more depending on nature of surfaces and velocity
E. has no correlation - Coulomb friction is the friction between_________________?
A. bodies having relative motion
B. two dry surfaces
C. two lubricated surfaces
D. solids and liquids
E. electrically charged particles - Pick up wrong statement about friction force for dry surfaces. Friction force is________________?
A. proportional to normal load between the surfaces
B. dependent on the materials of contact surface
C. proportional to velocity of sliding
D. independent of the area of contact surfaces
E. none of the above is wrong statement - The coefficient of friction depends on_________________?
A. area of contact
B. shape of surfaces
C. strength of surfaces
D. nature of surface
E. all of the above - Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction__________________?
A. along the plane
B. horizontally
C. vertically
D. at an angle equal to the angle of friction to the inclined plane
E. unpredictable - Kinetic friction is the________________?
A. tangent of angle between normal reac-tion and the resultant of normal reac-tion 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. dynamic friction - The effort required to lift a load W on a screw jack with helix angle a and angle of friction <j) is equal to_________________?
A. Wtan(a + )
B. Wtan(a-)
C. Wcos(a + )
D. Wsin(a + )
E. W (sin a + cos ) - Tangent of angle of friction is equal to_________________?
A. kinetic friction
B. limiting friction
C. angle of repose
D. coefficient of friction
E. friction force - On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be__________________?
A. towards the wall at its upper end
B. away from the wall at its upper end
C. upwards at its upper end
D. downwards at its upper end
E. none of the above
