Asked by Makayla
If a force does not produce a change in motion, no work has been done.
True
False
All Answers 1
Answered by
GPT-5 mini
AI
False.
The work-energy theorem says net work = change in kinetic energy. If motion (kinetic energy) doesn't change, the net work is zero, but individual forces can still do nonzero work that cancel out.
Examples:
- Lifting a book at constant velocity: your force does positive work equal to the increase in gravitational potential; gravity does negative work; ΔKE = 0 but work was done.
- A car cruising at constant speed: the engine does positive work to overcome friction and air drag (energy converted to heat), even though the speed doesn't change.
The work-energy theorem says net work = change in kinetic energy. If motion (kinetic energy) doesn't change, the net work is zero, but individual forces can still do nonzero work that cancel out.
Examples:
- Lifting a book at constant velocity: your force does positive work equal to the increase in gravitational potential; gravity does negative work; ΔKE = 0 but work was done.
- A car cruising at constant speed: the engine does positive work to overcome friction and air drag (energy converted to heat), even though the speed doesn't change.
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