When a person lifts a body from the ground, the work done by the lifting force is
Correct answer: A. positive
- A. positive
- B. negative
- C. zero
- D. one
Explanation
When a person lifts a body from the ground, the lifting force acts in the same direction as the displacement (upwards). Since the force and displacement are in the same direction, the work done by the lifting force is positive.Incorrect Options Explanation:(b) negative: The work done by the lifting force is positive because it is in the same direction as the displacement.(c) zero: If no work were done, the body wouldn't move upwards when lifted.(d) one: This option doesn't accurately describe the work done in lifting a body.
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About Work and Energy
Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
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