1. A block of mass M is placed on a flat surface. A force is applied to move it parallel to the surface. The frictional force f developed is proportional to the

2. The frame of reference attached to a satellite of the earth is

3. Ratio of force and acceleration measures :

4.  A ball is travelling with uniform translator motion. This means that

5. A metre scale is moving with uniform velocity. This implied

6. A jet plane flying in atmosphere gets reaction from

7. A jet of water of cross-sectional area ‘a’ strikes a wall at angle θ with the wall and rebounds elastically with the same speed v. If density of water be p, then the normal thrust on the wall will be

8. Out of the basic forces , gravitational force

9. A body is placed on an inclined plane and has to be pushed down. The angle made by the normal reaction with the vertical will be

10. The mass of a body is 2 kg. It weight is

11. Two bodies of masses 4 kg and 5 kg are acted upon by the same force. If the acceleration of lighter body is 2 m/s², the acceleration of heavier body is

12. A bullet of mass 25 g moving with a velocity of 200 cm/s is stopped within 5 cm of the target. The average resistance offered by the target is

13. A hockey player is moving northward and suddenly turns westward with the same speed to avoid an opponent. The force that acts on the player is

14. Conservation of momentum in a collision between particles can be understood from

15. A block of mass 2 kg rests on a rough inclined plane making an angle of 30 degree with the horizontal. The coefficient of static friction between he block and the plane is 0.7. The frictional force on the block is

16. A block of wood is placed on a surface. A force is applied parallel to the surface to move the body. The frictional force developed acts

17. A particle of mass 0.3 kg is subjected to a force F = -kx with k = 15 N/m. What will be its initial acceleration if it is released from a point 20 cm away from the origin?

18. A man in a train in motion is facing the engine. He tosses a coin up, the coin falls behind him. The train is

19. A body of mass 2 kg travels according to the law x(t) = p(t) + qt2 + rt3 where p = 3 m/s, q = 4 m/s2, and r = 5 m/s3. The force acting on the body at t=2 seconds is

20. A fireman wants to slide down a rope. The breaking load for the rope is 34 th of the weight of the man. With what minimum acceleration should the fireman slide down? Acceleration due to gravity is g.