# AS Physics Work and Energy

Define Work
Force applied x displacement in the direction of the force
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What is Work measured in?
Nm or J
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When is Mechanical Work done?
When a force moves
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What is the Work equation?
W = Fs
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Define Component
The effect a forces has in a particular direction
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What is a Component Triangle?
A right-angled triangle in which the force formed the hypotenuse
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What are the equations for a Component Triangle?
W= FsCOS(angle) or W = FsSIN(angle)
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Define Potential Energy
Energy stored within a system as a result of position or condition
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Define Kinetic Energy
The energy of motion
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What is the Principle of Conservation of Energy?
Energy cannot be created or destroyed- it can only be transferred
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What is the Work-Energy Principle?
The change of energy of an object is equal to the net work done on the object
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What is the Kinetic Energy equation?
Ek = 1/2mv2
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What is the Gravitational Potential Energy equation?
Ep = mg(delta)h
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Define Power
The work done per unit time (rate of doing work)
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What is Power measured in?
J s-1 or J/s or W
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What is the Power equation?
Power = work done/time
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What is the Efficency Equation?
Useful power output/total imput
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## Other cards in this set

### Card 2

#### Front

What is Work measured in?

Nm or J

### Card 3

#### Front

When is Mechanical Work done?

### Card 4

#### Front

What is the Work equation?

Define Component