# GCSE Physics AQA (single science) equations paper 2

## Gravity (weight)

W = m x g

W = weight (N)

m = mass (kg)

g = gravitational field strength (N/kg)

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## Work Done

W = F x s

W = work done (J)

F = force (N)

s = distance (m)

1 joule = 1 newton metre

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## Force

F = k x e

F = force (N)

k = spring constant (N/m)

e = extension (m)

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## Moments

M = F x d

M = moment of a force (Nm)

F = force (N)

d = perpendicular distance from the pivot to the line of action of the force (m)

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## Pressure in a Fluid

p = F / A

p = pressure (Pa)

F = force (N)

A = area (m²)

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## Pressure in a Fluid (HT only)

p = h x ρ x g

p = pressure (Pa)

h = height of the column (m)

ρ = density (kg/m³)

g = gravitational field strength (N/kg)

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## Speed

s = v x t

s = distance travelled (m)

v = speed (m/s)

t = time (s)

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## Acceleration

a = Δv / t

a = acceleration (m/s²)

Δv = change in velocity (m/s)

t = time (s)

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## Acceleration pt2

v² - u² = 2 x a x s

v = final velocity (m/s)

u = initial velocity (m/s)

a = acceleration (m/s²)

s = distance (m)

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## Resultant Force (Newton's Second Law)

F = m x a

F = force (N)

m = mass (kg)

a = acceleration (m/s²)

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## Momentum

p = m x v

p = momentum (kg m/s)

m = mass (kg)

v = velocity (m/s)

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## Changes in Momentum

F = m Δv / Δt

F = resultant force (N)

m Δv = change in momentum

Δt = change in time

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## Properties of Waves

T = 1 / f

T = period (s)

f = frequency (Hz)

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## Properties of Waves pt2

v = f x λ

v = wavespeed (m/s)

f = frequency (Hz)

λ = wavelength (m)

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## Fleming's left hand rule

F = B x I x L

F = force (N)

B = magnetic flux density (T)

I = current (A)

L = length (m)

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## Transformers

Vs / Vp = Np / Ns

Vs = potential difference across secondary coil (V)

Vp = potential difference across primary coil (V)

Np = number of turns on primary coil

Ns = number of turns on secondary coil

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## Transformers (HT only)

Vs x Is = Vp x Ip

Vs = potential difference across secondary coil

Is = current across secondary coil

Vp = potential difference across primary coil

Ip = current across primary coil

Vs x Is = power output across secondary coil (in Watts , W)

Vp x Ip = power output across primary coil (in Watts , W)

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