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2 cards from this section. Quick, good the night before a test.
Define mechanical energy.
Think of all types of energy combined.
What is a conservative force? Give an example.
Recall forces that act on objects without path dependence.
What does the conservation of mechanical energy state?
Think about energy transformations.
Is gravitational force a conservative force?
Recall properties of conservative forces.
A skier starts from rest at the top of a slope, 20 m high. Calculate her speed at the bottom of the slope. Assume no friction.
Use the potential energy formula mgh for the height to get kinetic energy.
A 5 kg object is dropped from a height of 10 m. What is its velocity just before it hits the ground?
Apply energy conservation; potential energy converts to kinetic energy.
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