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________________?

Related Mcqs:

1. 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

2. 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

3. 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

4. The center of percussion of a solid cylinder of radius r resting on a horizontal plane will be_________________?

   A. r/2
   B. 2r/3
   C. r/A
   D. 3r/2
   E. 3r/A

5. 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

6. A single force and a couple acting in the same plane upon a rigid body_____________________?

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

7. Frictional force encountered after commencement of motion is called ___________________?

   A. post friction
   B. limiting friction
   C. kinematic friction
   D. frictional resistance
   E. dynamic friction

8. 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

9. 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

10. 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