Physicseasy · Past Paper
In which of the following cases is work done negative?
AWork done by gravity on a falling object
BWork done by friction on a moving object
CWork done by a person pushing a car
DWork done by a magnet attracting iron
✓ Correct Answer: B — Work done by friction on a moving object
Friction acts in the direction opposite to the motion, making the angle 180 degrees, resulting in negative work.
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