P1

What happens when an object falls?
It gains speed and its store of GPE decreases and its store of KE increases
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What happens when a falling object hits the ground without bouncing back?
Its KE store decreases and some or all of its energy are transferred to the surroundings
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What is the conservation of energy?
Energy cannot be created or destroyed
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What is the rule of a closed system?
The total energy of the system is always the same before and after
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What is work done?
Energy transferred
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What happens when an object moves up and down?
The GPE increases when it goes up and decreases when it goes down
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Why does the GPE of an object increase when it is lifted up?
Because work is done on it to overcome the gravitational force
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What does energy is dissipated mean?
`Spread out to be stored in less useful ways
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What happens as energy dissipates more and more?
It gets less useful
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How do machines waste energy?
Friction between their moving parts, air resistance, electrical resistance and noise
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How can machines be made more efficient?
Reduce the energy they waste, e.g. lubrication
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Other cards in this set

Card 2

Front

What happens when a falling object hits the ground without bouncing back?

Back

Its KE store decreases and some or all of its energy are transferred to the surroundings

Card 3

Front

What is the conservation of energy?

Back

Preview of the front of card 3

Card 4

Front

What is the rule of a closed system?

Back

Preview of the front of card 4

Card 5

Front

What is work done?

Back

Preview of the front of card 5
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