Frictional force encountered after commencement of motion is called ___________________?

Related Mcqs:

1. 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

2. The resultant of the following three couples 20 kg force, 0.5 m arm, $ ve sense 30 kg force, 1 m arm, – ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be__________________?

   A. 20 kg, – ve sense
   B. 20 kg, + ve sense
   C. 10 kg, + ve sense
   D. 10 kg, – ve sense
   E. 45 kg, + ve sense

3. A body of weight W on inclined plane of a being pulled up by a horizontal force P will be on the point of motion up the plane when P is equal to________________?

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

4. A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is \i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will____________________?

   A. remain horizontal
   B. slant up towards direction of pull
   C. slant down towards direction of pull
   D. unpredictable
   E. none of the above

5. 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

6. The weight of a body is due to ___________________?

   A. centripetal force of earth
   B. gravitational pull exerted by the earth
   C. forces experienced by body in atmosphere
   D. force of attraction experienced by particles
   E. gravitational force of attraction towards the center of the earth

7. Center of gravity of a thin hollow cone lies on the axis at a height of ___________________?

   A. one-fourth of the total height above base
   B. one-third of the total height above base
   C. one-half of the total height above base
   D. three-eighth of the total height above the base
   E. none of the above

8. A force is completely defined when we specify_______________?

   A. magnitude
   B. direction
   C. point of application
   D. all of the above
   E. none of the above

9. 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

10. According to principle of transmissibility of forces, the effect of a force upon a body is_________________?

    A. maximum when it acts at the center of gravity of a body
    B. different at different points in its line of action
    C. the same at every point in its line of action
    D. minimum when it acts at the C.G. of the body
    E. none of the above