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

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.

A ball is thrown vertically upwards. It goes to a height 20 m and then returns to the ground. Taking acceleration due to gravity g to be 10 ms^-2, find: the initial velocity of the ball.

A ball is thrown vertically upwards. It goes to a height 20 m and then returns to the ground. Taking acceleration due to gravity g to be 10 ms^-2 , find : 
the final velocity of the ball on reaching the ground .

A ball is thrown vertically upwards. It goes to a height 20 m and then returns to the ground. Taking acceleration due to gravity g to be 10 ms^-2 , find : 
the total time of journey of the ball .

What is hydro energy? Explain the principle of generating electricity from hydro energy. How much hydro electric power is generated in India?

Multiple Choice Question. Select the correct option.

The mass of earth is 6 × 10²⁴ kg and radius of earth is 6.4 × 10⁶ m. The magnitude of force between the mass of 1 kg and the earth is:

Define one Newton. How much maximum acceleration can it produce in a mass of 1 kg?

The acceleration produced by a force in an object is directly proportional to the applied _________ And inversely proportional to the _________ Of the object.