Energy II
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1
In an open system
energy and matter can be transferred between the system and its surroundings
2
In a closed system
A system in which no matter is allowed to enter or leave
3
In an isolated system
is unable to exchange energy or matter with its surroundings
4
Conservation of energy
Energy cannot be created or destroyed
5
When a force causes an object to move
Work is done against frictional forces
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If a force acts in the direction the object is moving
The object gains energy (usually KE)
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If a force acts in the opposite direction to the movement
The object loses energy (usually heat)
8
Work done equation
E = Fd
9
Change in GPE
mass x gravitational field strength x change in height
10
Power =
E/T
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