# Equations for GCSE physics.

The equations for GCSE physics.

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## Average speed.

Speed (metre per second, m/s)= distance travelled (metre m) / time taken (second, s)

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## Acceleration.

Acceleration = change in speed / time taken

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## Momentum.

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

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## Change in momentum.

Change in momentum (kg m/s) = resultant force (newton, N) x time for which it acts (s)

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## Amount of energy transferred.

Amount of energy transferred (joule, J) = work done (joule, J)

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## Weight.

Weight (newton, N) = mass (kilogram, kg) x gravitational field strength (N/kg)

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## Gravitational potential energy.

Change in gravitational potential energy = weight x change in height

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## Kinetic energy.

Kinetic energy = 1/2 x mass x (speed)2

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## Resistance.

Resistance(ohms) = voltage(V) / current(amp,A)

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## Calculating voltages.

Primary voltage / secondary voltage = turns on primary / turns on secondary

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