What is it
This topic covers work done by a force (force × distance moved), kinetic and potential energy, the principle of conservation of energy, and power as the rate at which work is done.
Why it matters
The work-energy approach often solves mechanics problems far more efficiently than force-and-acceleration methods, especially when only the start and end states of a system matter rather than the details of the motion in between.
Exam tip
Before choosing a method, ask whether energy is conserved in the situation — if it is, the work-energy approach is usually faster than SUVAT or F = ma, but forgetting to account for friction or resistance (where energy is lost) is a common error.
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