MEDIUM
9th CBSE
IMPORTANT
Earn 100

In the following question, a statement of Assertion is given by the corresponding statement of Reason. Of the statements, mark the correct answer as
Assertion: Does Newton’s third law of motion apply to a system where bodies do not actually touch each other?
Reason: Action and reaction forces act on only first body.

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Important Questions on Force and Laws of Motion

MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 9 - Force and Laws of Motion>CHAPTER EXERCISE>Q 8
In the following question, a statement of Assertion is given by the corresponding statement of Reason. Of the statements, mark the correct answer as
Assertion: Rocket moves on the principle of conservation of energy.
Reason: Conservation of momentum is not applicable for motion of rocket.
EASY
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 9 - Force and Laws of Motion>CHAPTER EXERCISE>Q 9
Two similar vehicles are moving with the same velocity on the road such that one of them is loaded and the other one is empty. Which of the two vehicles will require larger force to stop it? Give reasons.
EASY
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 9 - Force and Laws of Motion>CHAPTER EXERCISE>Q 10
Name two effects a force can bring about other than moving or stopping a body.
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 9 - Force and Laws of Motion>CHAPTER EXERCISE>Q 11
State Newton’s first law of motion. In first law holds good. Why does rolling footballs come to rest on its own?
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 9 - Force and Laws of Motion>CHAPTER EXERCISE>Q 12
A body p has mass 2m and velocity 5v. Another body q has mass 8m and velocity 1.25v. Which of the p and q has more momentum?
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 9 - Force and Laws of Motion>CHAPTER EXERCISE>Q 13
State two factors which determine the momentum of a body.
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 9 - Force and Laws of Motion>CHAPTER EXERCISE>Q 14
A body of mass 20 kg moves with an acceleration of 2 m s-2. Calculate the rate of change in momentum.
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 9 - Force and Laws of Motion>CHAPTER EXERCISE>Q 15
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.