(English Medium) ICSE Class 9 - CISCE Question Bank Solutions

Why do the dust particles come out of a hanging carpet when it is beaten with a stick?

Why is a tree shaken to get its fruit down?

An object undergoes an acceleration of 8 ms-2 starting from rest. Find the distance travelled in 5 seconds.

Define acceleration due to gravity.

Define the constant of gravitation.

What are the SI units of constant of gravitation?

The gravitational force of the earth is called earth's __________.

he gravity is a particular case of _________.

What is the relation between Newton and dyne?

Name and state the action and reaction in the following case:
 Firing a bullet from a gun.

Name and state the action and reaction in the following case:
Pushing a wall.

Define one newton. What is the ratio of SI to CGS units of force?

A boy pushes a wall with a force of 30 N towards east. What force is exerted by the wall on the boy?

Write the SI unit of retardation.

A force acts for 0.1 s on a body of mass 3.2 kg initially at rest. The force then ceases to act and the body moves through 3 m in the next one second. Calculate the magnitude of force.

Write the answer of the question with reference to laws of gravitation.

State the universal law of gravitation.

What happens to the force between two objects, if the masses of both objects are doubled?

Explain the following:

People often shake the branches of a tree for getting down its fruits.

State whether the gravitational force between two masses is attractive or repulsive ?  

Write an expression for the gravitational force of attraction between two bodies of masses m₁ and m₂ separated by a distance r.