Class 9 science - Chapter 9 laws of motion

The law of motion which is known as Law of inertia

• First law

• Second law

• Third law

The law of motion which is known as Law of conservation of momentum

• First law

• Second law

• Third law

The law which explains that the rate of change of momentum is directly proportional to the force applied

• First law

• Second law

• Third law

Which of the following will have a greater inertia if these are moving with the same velocity

• 2kg

• 4kg

• 5kg

Launching of rocket is based on the principle of

• First law

• Second law

• Third law

Explain why dust particles fall of a mat when we strike it with a stick

If a an object of 2 kg falls from the top of a buildings strike a box at rest of 2kg with a velocity of 5m/s,and both fall together, find out the velocity with which both starts after collision

Find out the force required to move an object of 20kg at rest to move it with a velocity of 2m/s for 4seconds