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5/37 MCQs for:

MECHANICS : FORCES - Newton’s laws of Motion

In a collision, a person wearing a seatbelt experiences less injury because:

The force acting on the person is reduced by the seatbelt.

The seatbelt acts as an external force.

The acceleration is decreased.

The seatbelt applies an equal and opposite force.

Which of the following is an example of Newton's Third Law?

A car speeding up due to an increase in force.

A person jumping forward off a moving bus.

A falling object accelerating due to gravity.

A swimmer pushing off the pool wall.

Which of the following is a real-life example of Newton's First Law of Motion?

A car accelerating when the accelerator is pressed.

A person jerking forward when a car suddenly stops.

A person swimming forward by pushing against the water.

A rocket moving forward due to the expulsion of gas.

A body is said to be in mechanical equilibrium when the:

Weight is equal to the reaction force.

Sum of external forces on it is zero.

Resultant moment on the body is zero.

Resultant external force on it is zero and sum of moment is zero.

The figure shows an arrangement which is used to investigate collisions between two trolleys. Trolley B is initially stationary and the end of Y of the tape is closer to trolley A.

A ticker tape produced from this experiment will likely be: