An object is thrown straight up. Which of the following is true about the sign of work done by the gravitational force while the object moves up and then down?
Correct answer: C. Work is negative on the way up, work is positive on the way down
- A. Work is positive on the way up, work is positive on the way down
- B. Work is negative on the way up, work is negative on the way down
- C. Work is negative on the way up, work is positive on the way down
- D. Work is positive on the way up, work is negative on the way down
Explanation
If displacement is in the direction of gravitational force, the work Is positive, as going downward. If the displacement is against the gravitational force. the work is negative. as going upward.
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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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