All In One SCIENCE CBSE Class IX>Chapter 9 - Force and Laws of Motion>CHAPTER EXERCISE>Q 11

MEDIUM

9th CBSE

IMPORTANT

Earn 100

State Newton’s first law of motion. In first law holds good. Why does rolling footballs come to rest on its own?

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 12

A body

p

has mass

2 m

and velocity

5 v

. Another body

q

has mass

8 m

and velocity

1.25 v

. 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 k g

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.

MEDIUM

9th CBSE

IMPORTANT

All In One SCIENCE CBSE Class IX>Chapter 9 - Force and Laws of Motion>CHAPTER EXERCISE>Q 16

A bus starts from the stop and take