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### 9 Cards in this Set

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 Work Done (J) Work Done (J)= Force(N) × Distance (Metres) Weight (N) Weight(N) = Mass (kg) ×Gravity (N/kg) Δ in an object's PE(Change inan object's gravitational potential energy) Δ in an object's PE= Weight (N) × Δ of height (m) Δ Gravitational Potential Energy (EP) ΔEP = Mass (kg) ×gravitational field strength × change of height (ΔH) Kinetic energy (J) Kinetic energy(J) = 1/2 mass (kg) ×speed squared (metres per second) Elastic potential energy, Ee (J) Ee (J) = 1/2 spring constant ×extension squared (Newtons per metre) (metres squared) Efficiency (%) Useful Output (J) / Total Input ×100 Power (Watts) Energy (J)/ Time (seconds) Power wasted Power wasted= total power in- useful power out