# Equations you should know

Velocity
frequency x wavelength
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Density
Mass/Volume
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Acceleration
Change of velocity/time
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Ideal transformer ( for 100% efficiency)
Vp Ip = Vs Is
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Average speed
Total distance/Total time
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Kinetic energy
1/2 x Mass x Velocity squared
6 of 28
Potential energy
Mass x gravitational field strength x height
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Refractive index (1)
Speed of light in a vacuum/speed of light in a material
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Refractive index (2)
Sine of angle to the normal/Sine of angle to the normal in material
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Specific latent heat
Energy/mass
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Resistence
Voltage/current
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Electrical power
Current x voltage
12 of 28
Energy
Mass x specific heat capacity x temperature change
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Efficiency
Useful energy output/ Total energy input (x 100%)
14 of 28
Moment of a force
Force x perpendicular distance from pivot
15 of 28
Force
Spring constant x extension
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Weight
Mass x gravitational field strength
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Unbalanced force
Mass x acceleration
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Work done
Force x distance = change of energy
19 of 28
Power
Energy / time
20 of 28
Pressure (1)
Force / area
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Pressure (2)
Depth x density x gravitational field strength
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Pressure (3)
Pressure x volume = Constant (at constant temperature)
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Frequency
1 / time period
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Current
Charge / time
25 of 28
Electrical energy
Current x voltage x time
26 of 28
Ideal transformer
Vp/Vs=Np/Ns
27 of 28
End of Physics IGCSE equations test
Thank you for participating
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## Other cards in this set

Mass/Volume

Density

### Card 3

#### Front

Change of velocity/time

Vp Ip = Vs Is

### Card 5

#### Front

Total distance/Total time