A person stops his friend on a bicycle by pulling him opposite to bicycle's motion, the work done by him is:
Correct answer: A. Negative
- A. Negative
- B. Positive
- C. Zero
- D. All of the above
Explanation
When a person pulls their friend in the opposite direction of the bicycle's motion, the work done by them is negative. This is because the force they exert is opposite to the displacement of the friend, resulting in negative work.
This question appeared on the KMU Centralized Admission Test 2020 paper, which you can sit online with every answer explained.
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About Work
Work is done when a force produces displacement, with its value determined by the component of force along the displacement. The topic covers positive, negative and zero work, work by variable forces from force-displacement graphs, and the connection between net work and change in kinetic energy.
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