Practice question · Multiple choice
Some mechanics problems are far easier with energy methods than with forces. How can you tell in advance which approach a problem wants?
Hints
- Ask whether the question mentions time or the shape of the path.
- Energy is a scalar and knows nothing about direction.
Show the answer
C. That it asks about start and end states, not the path
Why
Energy relates endpoints; forces describe the journey. A speed at the bottom of a curved track is an energy problem; the time to get there is not.
Practise Problem-Solving: Mechanics
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