Unit 1- Energy

Question 1

What is the equation that links kinetic energy, mass and speed?

Answer 1

Kinetic energy (J) = ½ x Mass (kg) x Speed² (m/s)

Question 2

What is the equation that links gravitational potential energy, mass, gravitational field strength and height?

Answer 2

Gravitational potential energy (J) = mass (kg) x gravitational field strength (N/Kg) x height (m)

Question 3

What is the equation that links efficiency, useful energy output and total energy input?

Answer 3

Efficiency (J) = useful energy output (J) ÷ total energy input (J)

Question 4

What is the equation that links efficiency, useful power output and total power input?

Answer 4

Efficiency (J) = useful power output (W) ÷ total power input (W)

Question 5

What is the equation that links power, work done and time taken?

Answer 5

Power (W) = work done (J) ÷ time taken (s)

Question 6

What is the equation that links power, energy transferred and time taken?

Answer 6

Power (W) = energy transferred (J) ÷ time taken (s)