# Physics Equations

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• Created by: mshiarna
• Created on: 09-01-20 15:42

## weight

weight = mass x gravitational field strength

W = mg

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## work done

work done = force x distance (along the line of action of the force)

W = Fs

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## force applied to a spring

force applied to a spring = spring constant x extension

F = ke

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## distance travelled

distance travelled = speed x time

s = vt

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## resultant force

resultant force = mass x acceleration

F = ma

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## gravitational potential energy

gravitational potential energy = mass x gravitational field strength x height

Ep = mgh

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## momentum (triple science only)

momentum = mass x velocity

p = mv

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## kinetic energy

kinetic energy = 0.5 x mass x velocity^2

Ek = 0.5mv^2

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## acceleration

acceleration = change in velocity / time taken

a = Δv / t

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## power 1

power = energy transferred / time

P = E / t

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## power 2

power = work done / time

P = W / t

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## efficiency 1

efficiency = useful output energy transfer / total input energy transfer

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## efficiency 2

efficiency = useful power output / total power input

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## wave speed

wave speed = frequency x wave length

v = fλ

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## charge flow

charge flow = current x time

Q = It

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## potential difference

potential difference = current x resistance

V = IR

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## power 3

power = potential difference x current

P = VI

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## power 4

power = current^2 x resistance

P = I^2 R

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## energy transferred 1

energy transferred = power x time

E = Pt

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## energy transferred 2

energy transferred = charge flow x potential difference

E = QV

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## density

density = mass / volume

p = m / v

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