Equations

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Average speed

Average speed = distance / time

1 of 22

Force

Force = mass x acceleration

2 of 22

Acceleration

Acceleration = change in velocity / time taken

3 of 22

Momentum

Momentum = mass x velocity

4 of 22

Density

Density = mass / volume

5 of 22

Efficiency

 Efficiency = useful energy output from the system / total energy input to the system x 100

6 of 22

Work done

Work done = force x distanced moved in direction of force

7 of 22

Energy transfered

Energy transfered = work done

8 of 22

Kinetic energy

Kinetic energy = 1/2 x mass x speed2

9 of 22

Change in gravitational potential energy

Change in gravitational potential energy = mass x gravitational field strength

10 of 22

Change in gravitational potential energy

Change in gravitational potential energy = mass x gravitational field strength x height

11 of 22

Weight

Weight = mass x gravitational field strength

12 of 22

Pressure

Pressure = force / area

13 of 22

Moment

moment = force x perpendicular distance from pivot

14 of 22

Charge

Current = Current x time

15 of 22

Voltage

Voltage = current x resistance

16 of 22

Electrical power

Electrical power = voltage x current

17 of 22

Wave speed

Speed = frequency x wave length

18 of 22

input power = output power

Input voltage / output voltage = primary turns / secondary turns

19 of 22

V

Vp / Vs = Np / Ns

20 of 22

N

N = Sin i / Sin r

21 of 22

Pressure difference

Pressure difference = height x density x g 

22 of 22

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