Energy equations

• Work done = force x distance moved (J)
• GPE = mass (kg) x gravitational field strength (N/kg) x change in height, (m)
• Kinetic Energy (J) = 0.5 x mass (kg) x speed squared (m/s)
• Power (W) = energy transferred / time taken
• Efficiency = useful output power / total input power x 100%
• Efficiency = useful energy transferred by device / total energy supplied to the device x 100
• Elastic potential energy = 1/2 x spring constant x extension squared