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9th CBSE
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A passenger in a moving train tosses a coin which falls behind him. It means that motion of the train is

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Important Questions on Force And Laws Of Motion

HARD
9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 9 - Force And Laws Of Motion>Multiple Choice Questions>Q 6
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 _____.
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9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 9 - Force And Laws Of Motion>Multiple Choice Questions>Q 7
Rocket works on the principle of conservation of
MEDIUM
9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 9 - Force And Laws Of Motion>Multiple Choice Questions>Q 8
A water tanker filled up to 23 of its height is moving with a uniform speed. On sudden application of the brake, the water in the tank would
HARD
9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 9 - Force And Laws Of Motion>Short Answer Questions>Q 9
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?
EASY
9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 9 - Force And Laws Of Motion>Short Answer Questions>Q 10
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.
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9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 9 - Force And Laws Of Motion>Short Answer Questions>Q 11
Two identical bullets are fired one by a light rifle and another by a heavy rifle with the same force. Which rifle will hurt the shoulder more and why?
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9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 9 - Force And Laws Of Motion>Short Answer Questions>Q 12

A horse continues to apply a force in order to move a cart with a constant speed. Explain why?

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9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 9 - Force And Laws Of Motion>Short Answer Questions>Q 13
Suppose a ball of mass m is thrown vertically upward with an initial speed u, its speed decreases continuously till it becomes zero. Thereafter, the ball begins to fall downward and attains the speed u again before striking the ground. It implies that the magnitude of initial and final momenta of the ball are same. Yet, it is not an example of conservation of momentum. Explain why?