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5/37 MCQs for:

MECHANICS : FORCES - Newton’s laws of Motion

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

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

Resultant moment on the body is zero.

Weight is equal to the reaction force.

Sum of external forces on it is zero.

The force acting on a body is 0 N. What is the acceleration of the body?

10 m/s².

100 m/s².

1 m/s².

0 m/s².

In the figure, a shop keeper pulls a bag of rice of mass 50 kg along a rough horizontal floor, against a frictional force of 20N.

He applies a force of 100N on an inextensible string, inclined at an angle of 60° to the horizontal.

The acceleration of the bag is:

0.3 ms⁻².

6 ms⁻².

0.6 ms⁻².

2 ms⁻².

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

A person jumping forward off a moving bus.

A falling object accelerating due to gravity.

A car speeding up due to an increase in force.

A swimmer pushing off the pool wall.

Which of the graphs in the figure best represents the variation of acceleration (Y) of a small ball dropped from the first floor of a storey building with time (X)?