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

Complete the following diagrams shown in the below figure by drawing the reflected ray for each incident ray.

The separation between two masses is reduced to half. How is the magnitude of gravitational force between them affected?

What is the C.G.S. unit of force? How is it defined?

Name the S.I. and C.G.S. units of force. How are they related?

Why does a glass vessel break when it falls on a hard floor, but it does not break when it falls on a carpet?

A body of mass 500 g, initially at rest, is acted upon by a force which causes it to move a distance of 4 m in 2 s, Calculate the force applied.

A car of mass 480 kg moving at a speed of 54 km h^-1 is stopped by applying brakes in 10 s . Calculate the force applied by the brakes . 

A light ball falling on ground, after striking the ground rises upwards. Explain the reason.

How does the gravitational force of attraction between two masses depend on the distance between them?

How is the gravitational force between two masses affected if the separation between them is doubled?

Define gravitational constant G.

Write the numerical value of gravitational constant G with its S.I. unit .

What is the importance of law of gravitation ?

Write an expression for the force due to gravity on a body of mass m and explain the meaning of symbols used in it.

Write down the average value of g on Earth's surface ?

The gravitational force between two bodies is : 

The value of G is : 

The force of attraction between two masses each of 1 kg kept at a separation of 1 m is : 

The force of attraction between two bodies at certain separation is 10 N. What will be the force of attraction between them if the separation is reduced to half? 

A body falls from the top of a building and reaches the ground 2.5 s later. How high is the building? (Take g = 9.8 m s^-2)