A force "F" acts on a body at an angle of 60° with the horizontal and moves it 10 m in horizontal direction. The effective component of the force which performs work is:
Correct answer: A. 0.5 F
- A. 0.5 F
- B. 0.866F
- C. Fcos30o
- D. 0.707 F
Explanation
The effective component of force is that which is in the direction of displacement. As displacement is in a horizontal direction the horizontal component of force is the effective component. Effective component = Fcos60° = 0.5 F
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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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