Unit 1: Energy

Question 1

Equation for kinetic energy

Answer 1

Kinetic energy = 1/2 x mass x speed^2

Ek = 1/2 m v^2

Question 2

Equation for gravitational potential energy

Answer 2

GPE = mass x gravitational field strength x height

Ep = m g h

Question 3

Equations for power

Answer 3

Power = work done/time taken
Power = energy transferred/time taken

P = W/t = E/t

Question 4

Equation for efficiency

Answer 4

Efficiency = useful energy output/total energy input x 100