Force and Laws of Motion Science - Force and Laws of Motion

1. Balanced forces.
2. Centripetal forces.
3. Unbalanced forces.
4. Centrifugal forces.

A fielder pulls his hands backwards after catching the cricket ball. This enables the fielder to:

1. Exert larger force on the ball.
2. Reduce the force exerted by the ball.
3. Increase the rate of change of momentum.
4. Keep the ball in hands firmly.

A passenger in a moving train tosses a coin which falls behind him. This shows that the motion of train is:

1. Accelerated.
2. Uniform.
3. Retarded.
4. Along circular track.

When we talk of a force acting on a body, it usually means:

1. Electrical force.
2. Balanced force.
3. Unbalanced force.
4. Nuclear force.

Which of the following effect cannot be produced by an unbalanced force acting on a body?

1. Change in speed of the body.
2. Change in shape of the body.
3. Change in direction of motion of the body.
4. Change in state of rest of the body.

1. An elephant of mass 2000kg moving at 5m/s.
2. A bullet of mass 0.02kg moving at 400m/s.

1. Find the acceleration.
2. Calculate the unbalanced force acting on the vehicle.

A ball X of mass 1kg travelling at 2m/s has a head-on collision with an identical ball Y at rest. X stops and Y moves off. Calculate the velocity of Y after the collision.

1. The velocity with which the gun recoils.
2. The force exerted on gunman due to recoil of the gun.