Two balls of the same size but of different materials, rubber and iron are
kept on the smooth floor of a moving train. The brakes are applied suddenly
to stop the train. Will the balls start rolling? If so, in which direction? Will
they move with the same speed? Give reasons for your answer.
There are three solids made up of aluminium, steel and wood, of the same shape and same volume. Which of them would have highest inertia?
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
Rocket works on the principle of conservation of
(a) mass
(b) energy
(c) momentum
(d) velocity
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
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
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
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
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
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