Explain the inertia of rest.

Important Questions on Force and Laws of Motion

MEDIUM

9th CBSE

IMPORTANT

Physics>Chapter 2 - Force and Laws of Motion>EXAM PRACTICE QUESTIONS>Q 19

Explain the inertia of motion.
 

MEDIUM

9th CBSE

IMPORTANT

Physics>Chapter 2 - Force and Laws of Motion>EXAM PRACTICE QUESTIONS>Q 20

 When a person jumps out of a moving train/bus, keeping his face in the direction of the bus, he falls with his face down. Explain.

MEDIUM

9th CBSE

IMPORTANT

Physics>Chapter 2 - Force and Laws of Motion>EXAM PRACTICE QUESTIONS>Q 21

When you take a long jump on a hard surface, your feet get hurt, but not when you jump on a sandy surface. Explain.

MEDIUM

9th CBSE

IMPORTANT

Physics>Chapter 2 - Force and Laws of Motion>EXAM PRACTICE QUESTIONS>Q 22

On what factors do the inertia of a body depend? Which has more inertia, empty tin or a tin of the same size filled with sand?

MEDIUM

9th CBSE

IMPORTANT

Physics>Chapter 2 - Force and Laws of Motion>EXAM PRACTICE QUESTIONS>Q 23

Firemen have to brace themselves when aiming a fire hose onto a fire. Explain.

MEDIUM

9th CBSE

IMPORTANT

Physics>Chapter 2 - Force and Laws of Motion>EXAM PRACTICE QUESTIONS>Q 24

Derive the relationship. F = m (v-u)/t, where each symbol has its usual significance.

HARD

9th CBSE

IMPORTANT

Physics>Chapter 2 - Force and Laws of Motion>EXAM PRACTICE QUESTIONS>Q 25

How can you explain flying of an aeroplane in terms of Newton's laws of motion?

MEDIUM

9th CBSE

IMPORTANT

Physics>Chapter 2 - Force and Laws of Motion>EXAM PRACTICE QUESTIONS>Q 26

 Why does a fielder pull his arms back while trying to stop or catch a cricket ball?