To push the ground backwards and walk, the force needed is

The momentum of an isolated system always remains

The force that keeps a body to move in a circle is known as

The shape and size of a body on which action takes place can also be changed due to

When donkey pulls a cart, the action is on the

The resultant of all the forces acting on a body is called

The quantity of motion a body possesses due to its mass and velocity is called

A force acting on a body of mass 7 kg produces an acceleration of 10 ms⁻². The acceleration that the same force will produce in a body of mass 9 kg will be

The body jumps out of a moving van. There is a danger for him to fall in

Two masses 4.5 kg and 3.8 kg are attached to the ends of an inextensible string passes over a frictionless pulley. Its acceleration when both masses are moving vertically will be equal to

The resultant of all the forces acting on body is

As compare to sliding friction, the rolling friction is

If we make the sliding surfaces smooth by lubricating etc. the friction can be

When a force acts on a body, it produces an acceleration in the body and will be equal to the rate of change of

If a body is moving in a straight line then net force acting on it is

Centripetal reaction that pulls the string outward is sometimes called the

The weight of a body is 150 N. Its mass will be

Which of the following material lowers friction when we pushed between metal plates

The force with which the earth attracts the bodies towards its center is called

The acceleration produced by a force of 120 N in a mass of 35 kg will be