The work done by gravity during tile descent of a projectile:
Correct answer: A. Is positive
- A. Is positive
- B. Is negative
- C. Is zero
- D. Depends for its sign on the direction of the y axis
Explanation
During descent (downward motion) force of gravity and displacement are in the same direction. So, θ = 0°, cosθ = 1 W = Fd (+ve)
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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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