When a lift is accelerated upward, the apparent weight of an object in it will be:
Correct answer: D. Greater than its real weight
- A. Equal to its real weight
- B. Less than its real weight
- C. Zero
- D. Greater than its real weight
Explanation
The apparent weight of an object is the force exerted by the object on the surface it is resting on. When a lift is accelerated upward, the acceleration adds to the gravitational pull, making the apparent weight greater than the real weight. This is due to the net force being the sum of gravitational force and upward acceleration. In contrast, if the lift were accelerating downward, the apparent weight would be less. If the lift were in free fall, the apparent weight would be zero because both the object and the lift would be accelerating at the same rate, eliminating any normal force.
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
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About Weightlessness and Artificial Gravity
Weightlessness means the apparent weight or supporting force on an object is zero, as in free fall or an orbiting spacecraft, not that gravity has disappeared. Artificial gravity is produced by centripetal acceleration, usually through rotation. Questions compare gravitational force, normal reaction, orbital motion and the sensation of weight.
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