When a force is applied to a body, several effects are possible. Which one of the following effects could not occur?
Correct answer: D. Mass of body decreases
- A. The body speeds up
- B. The body rotates
- C. The body changes direction
- D. Mass of body decreases
Explanation
The correct answer is that the mass of the body decreases. The mass of a body is an intrinsic property that remains unchanged when a force is applied. Forces can change the speed, cause rotation, or alter the direction of a body's motion, but they do not change mass. Options A, B, and C describe possible effects of force application, such as acceleration, rotation, or direction change, all of which are consistent with the laws of physics.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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About Newton's Laws of Motion
Newton’s laws explain inertia, the relation between net force and acceleration, and action-reaction pairs. Questions involve free-body diagrams, balanced and unbalanced forces, F = ma, force as the rate of change of momentum, and identifying genuine third-law pairs, which act on different bodies.
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