Question

Which of the following is not an example of the turning effect of force?

• A. Force exerted by wind on the blades of windmill causes it to rotate on its axis
• B. The motion of a swing
• C. Force applied through a wrench to open a nut
• D. Force applied on a box to push it through a distance

Answer 1

The correct option is D

Force applied on a box to push it through a distance

The explanation for the correct option D:

1. Force applied to a box to push it through a distance is an example of linear motion.
2. No turning effect of force can be seen here hence is not an example of the turning effect of force.

The explanation for the incorrect option A:

1. Force exerted by the wind on the blades of the windmill causes it to rotate on its axis is an example of rotatory motion which is brought up by the turning effect of force.
2. Hence is an example of the turning effect of force.

The explanation for incorrect option B:

1. The motion of a swing is an example of the turning effect of force as the swing tends to possess rotatory motion.

The explanation for incorrect option C:

1. Force applied through a wrench to open a nut is also an example of the turning effect of force.
2. The opening of the nut represents rotatory motion which is also a case of the turning effect of force.

Conclusion:

Thus option (D) is the correct option.