When a body moves in the direction of gravitational force i.e. towards the earth, the work is done by the force of gravity on the body and is _, whereas when the body moves against the direction of gravitational force, the corresponding work done is _.
Correct answer: B. positive, negative
- A. negative, positive
- B. positive, negative
- C. positive, positive
- D. negative, negative
- E. Insufficient Information
Explanation
When the work is done in the direction of the force then work done is said to be positive. However, if the work is in opposition to the direction of force then the work done is said to be negative.
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Newton’s law of universal gravitation relates the force between masses to their masses and separation, while gravitational field strength explains weight and orbital motion. The topic covers satellite velocity and period, escape ideas, weightlessness in free fall, and artificial gravity, which differs from ordinary gravitational attraction.
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