Asked by ABAINEH
42. Which of the following best defines and describes the scientific meaning of work in physics?
A. work is done when energy is transferred without applying any force
B. work is done when energy a force is applied to an object, and the object moves in the direction of the force.
C. work is done when an object, and the object is at rest and no force is applied
D. work is done when a force is applied to an object, but the object does not move’
All Answers 1
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Correct answer: B.
Explanation: In physics work is defined as the dot product of force and displacement: W = F · d = F d cosθ. Work is done when a force acts on an object and the object undergoes a displacement with a component along the force. If the force is perpendicular to the displacement, the work is zero; if the force and displacement are opposite, the work is negative. Units: joules (N·m).
Why the others are wrong:
- A: contradicts itself (work involves a force and energy transfer).
- C and D: no displacement (or no force) means no work by the physics definition.
Explanation: In physics work is defined as the dot product of force and displacement: W = F · d = F d cosθ. Work is done when a force acts on an object and the object undergoes a displacement with a component along the force. If the force is perpendicular to the displacement, the work is zero; if the force and displacement are opposite, the work is negative. Units: joules (N·m).
Why the others are wrong:
- A: contradicts itself (work involves a force and energy transfer).
- C and D: no displacement (or no force) means no work by the physics definition.
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