Physics - Energy Key Words

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Kinetic Energy
The energy of a moving object
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Kinetic Calculation
Ek = 1/2 x m x v2
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Chemical Energy
The energy stored in fuel (including food). This energy is released when chemical reactions take place
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Gravitational Potential Energy (GPE)
The energy of an object due to its position
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Gravitational Potential Energy Calculation
Ep = m x g x h --> Ep = change in GPE (Joules, J); m = mass (kilograms, kg); g = gravitational field strength (Newtons per kilogram, N/kg); h = change in height (Metres, m)
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Elastic Potential Energy (EPE)
The energy stored in a springy object when we stretch or squash it
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Electrical Energy
The energy transferred by an electric current
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Work Done Calculation
W = F x d--> W = work done (Joules, J); F = force (Newtons, N); d = distance (Metres, m)
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Power
The rate of transfer of energy
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Power Calculation
P = E ÷ t --> P = Power (Watts, W); E = energy transferred (Joules, J); t = time taken (seconds, s)
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Momentum
The force and speed of an object
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Momentum Calculation
p = m x v --> p = momentum (kilogram metres per second, kg m/s); m = mass (kilorgams, kg); v = velocity (metres per second, m/s)
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The Law of Conservation of Momentum
Whenever objects interact, the total momentum before the interaction is equal to the total momentum afterwards - provided that no external forces act on them ∴ the total change of momentum is zero
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Conservation of Energy
Energy cannot be created or destroyed
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Other cards in this set

Card 2

Front

Ek = 1/2 x m x v2

Back

Kinetic Calculation

Card 3

Front

The energy stored in fuel (including food). This energy is released when chemical reactions take place

Back

Preview of the back of card 3

Card 4

Front

The energy of an object due to its position

Back

Preview of the back of card 4

Card 5

Front

Ep = m x g x h --> Ep = change in GPE (Joules, J); m = mass (kilograms, kg); g = gravitational field strength (Newtons per kilogram, N/kg); h = change in height (Metres, m)

Back

Preview of the back of card 5
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