Laws of motion

An external force is required to keep a body in motion. This is known as

• Aristotle’s Fallacy

• Galileo’s Fallacy

• Aristotle-Galileo Fallacy

An object of mass 2 kg is sliding with a constant velocity of 4 m/s frictionless horizontal table. The force required to keep the object moving with the same velocity is

• 32 N

• 0 N

• 2 N

• 8 N

A water tanker filled up to 2/3 of its height is moving with a uniform speed. On sudden application of the brake, the water in the tank would

• Move backward

• Mave forward

• Be unaffected

• Rise upwards

The inertia of an object tends to cause the object

• To increase its speed

• To decrease its speed

• To resist any change in its state of motion

• To decelerate due to friction

A goalkeeper in a game of football pulls his hands backwards after enables the goal keeper to

• Exert larger force on the ball

• Reduce the force exerted by the ball on hands

• Increase the rate of change of momentum

• Decrease the rate of change of momentum

According to the third law of motion, action and reaction

• Always act on the same body

• Always act on different bodies in opposite directions

• Have same magnitude and directions

• Act on either body at normal to each other

A cork of mass 10 g floating on water. What is the net force acting on the cork

• Can't be determined

• Net force is 10 N

• Net force is zero

Which is the concepts is described by the Newton's first law of motion?

• Momentum

• Inertia

• Impulse

• Force

Which of the following statements is an example of Newton’s First Law of Motion?

• A ball continues to roll unless friction stops it.

• A rocket accelerates when fuel burns.

• A balloon moves in the opposite direction when air escapes.

• A gun recoils after firing a bullet.

The inertia of a body depends on:

• Volume of the body

• Velocity of the body

• Acceleration of the body

• Mass of the body