ASSIGNMENT QUESTIONS
FORCE AND LAWS OF MOTION
Multiple Choice Questions
1. Which of the following statement is not correct for an object moving along a straight path in an accelerated motion?
(a) Its speed keeps changing
(b) Its velocity always changes
(c) It always goes away from the earth
(d) A force is always acting on it
2. The forces of action and reaction are
(a) always equal only
(b) always equal and opposite
(c) always equal but in same direction
(d) always unequal and opposite.
3. According to the third law of motion, action and reaction
(a) always act on the same body
(b) always act on different bodies in opposite directions
(c) have same magnitude and directions
(d) act on either body at normal to each other
4. The action and reaction forces at
(a) on different bodies always
(b) on some body always
(c) on same body, sometimes
(d) on different bodies, sometimes
5. A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goal keeper to
(a) exert larger force on the ball
(b) reduce the force exerted by the ball on hands
(c) increase the rate of change of momentum
(d) decrease the rate of change of momentum
6. The inertia of an object tends to cause the object
(a) to increase its speed
(b) to decrease its speed
(c) to resist any change in its state of motion
(d) to decelerate due to friction
7. Principle of conservation of linear momentum is deduced from
(a) Newton’s first law
(b) Newton’s second law
(c) Newton’s third law
(d) none of the above
8. The function of mud guards is based on
(a) inertia of rest
(b) inertia of direction
c) inertia of motion
(d) none of the above
9. The force of action and reaction
(a) always cancel each other
(b) never cancel
(c) cancel sometimes
(d) cannot say
10. A passenger in a moving train tosses a coin which falls behind him. It means that motion of the train is
(a) accelerated
(b) uniform
(c) retarded
(d) along circular tracks
11. An object of mass 2 kg is sliding with a constant velocity of 4 m s–1 on a frictionless
horizontal table. The force required to keep the object moving with the same velocity is
(a) 32 N
(b) 0 N
(c) 2 N
(d) 8 N
12. Rocket works on the principle of conservation of
(a) mass
(b) energy
(c) momentum
(d) velocity
13. A water tanker filled up to 2/3 of its height is moving with a uniform speed. On sudden
application of the brake, the water in the tank would
(a) move backward
(b) move forward
(c) be unaffected
(d) rise upwards
14. Inertia of a body in linear motion is measured by its
(a) mass
(b) momentum
(c) velocity
(d) none of the above
15. What mass of a body can attain an acceleration of 5m/s2
under a force of 250 N?
(a) 5 kg
(b) 250 kg
(c) 50 kg
(d) 10 kg
Answers
Answered by
20
Answer:
1) (c) It always goes away from the earth
2) (b) always equal and opposite
3) (a) always act on the same body
4) (b) on same body, always
5) (c) increase the rate of change of momentum
6) (c) to resist any change in its state of motion
7) (b) newton's second law
8) (a) inertia of rest
9) (a) always cancel each other
10) (a) uniform
11) (c) 2 N
12) (c) momentum
13) (a) move backward
14) (b) momentum
15) (I don't know this only, sorry ya)
Hope it helps!
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