# Equations to learn

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• Created by: Hlm153
• Created on: 27-05-18 16:51

## Topic 1 - Energy

Kinetic energy (J) = 1/2 * mass (kg) * speed (m/s)2

G.P.E (J) = mass (kg) * gravitational field strength (N/kg) * height (m)

Elastic potential energy (J) = 1/2 * spring constant (N/m) * extension (m)2

Change in thermal energy (J) = mass (kg) * specific heat capacity (J/kg°C)

Power (W) = energy transferred (J) / time (s)

Power (W) = work done (J) / time (s)

Efficiency = Useful output energy transfer / Total input energy transfer

Efficiency = Useful power output / Total power input

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## Topic 2 - Electricity

Potential difference (V) = current (A) * resistance (Ω)

Energy transferred (J) = power (W) * time (s)

Energy transferred (J) = charge flow (C) * potential difference (V)

Power (W) = potential difference (V) * current (A)

Power (W) = current (A) 2 * resistance (Ω)

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## Topic 3 - Particle model of matter

Density (kg/m3) = mass (kg) / volume (m3)

Energy (J) = mass (kg) * specific latent heat (J/kg)

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## Topic 5 - Forces

Weight (N) = mass (kg) * gravitational field strength (N/kg)

Work done (J) = force (N) * distance (m)

Force (N) = spring constant (N/m) * extension (m)

Elastic potential energy (J) = 1/2 * spring constant (N/m) * extension (m)2

Moment of a force (Nm) = force (N) * distance (m)

Pressure (Pa) = force (N) / area (m2)

Pressure (Pa) = height (m) * density (kg/m3) * gravitational field strength (N/kg) Distance (m) = speed (m/s) * time (s) Acceleration (m/s2) = change in velocity (m/s) / time (s)

Final velocity (m/s)2 - initial velocity (m/s)2 = 2 * acceleration (m/s2) * distance (m)

Resulutant force (N) = mass (kg) * acceleration(m/s2)

Momentum (kg m/ s) = mass (kg) * velocity (m/s)

Force (N) = change in momentum (kg m/s) / change in time (s)

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## Topic 6 - Waves

Wave speed (m/s) = frequency (Hz) * wavelength (m)

magnification = image height / object height

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## Topic 7 - Magnetism and Electromagnetism

Force (N) = Magnetic flux density (T) * Current (A) * Length (m)

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