If a force of 1N acts on a body through a distance of 1m in the direction of force, how much work is done?
Correct answer: A. +1 J
- A. +1 J
- B. -1 J
- C. 0 J
- D. Either a or b
Explanation
Work done is given by the dot product of force and displacement:W = F . S = F S cos θWhere:W is the work doneF is the forceS is the displacementθ is the angle between force and displacementIn this case, the force and displacement are in the same direction, so θ = 0° and cos θ = 1. Therefore, the work done is:W = F S cos θ = 1N * 1m * 1 = 1 JSince the force and displacement are in the same direction, the work done is positive.
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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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