Angle of friction is the_______________________?

Related Mcqs:

1. 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 ).

2. 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

3. 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

4. Friction force for dry surfaces. Friction force is________________?

   Pick up wrong statement?
   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

5. 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

6. 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

7. The angle which an inclined plane makes with the horizontal when a body placed on it is about to move down is known as angle of_______________?

   A. friction
   B. limiting friction
   C. repose
   D. kinematic friction
   E. static friction

8. 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

9. On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be_________________?

   A. downwards at its upper end
   B. upwards at its upper end
   C. perpendicular to the wall at its upper end
   D. zero at its upper end
   E. none of the above

10. 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