Unit 1: Energy

Question 1

Word equation for Kinetic Energy?

Answer 1

Kinetic Energy (Joules, J) = 0.5 x mass (Kilograms, kg) x (speed)² (Metres per second, m/s)

Question 2

Letter equation for kinetic energy?

Answer 2

Ek = 0.5 x m x v ²

Question 3

Word equation for elastic potential energy?

Answer 3

Elastic potential energy (Joules, J) = 0.5 x spring constant (Newtons per metre, N/m) x extension (Metres, m)

Question 4

Letter equation for elastic potential energy?

Answer 4

Ee = 0.5 x k x e ²

Question 5

Word equation for gravitational potential energy?

Answer 5

Gravitational potential energy (Joules, J) = mass (Kilograms, kg) x gravitational field strength (Newtons per kilogram, N/m) x height (Metres, m)

Question 6

Letter equation for gravitational potential energy?

Answer 6

Ep = m x g x h

Question 7

Word equation for change in thermal energy?

Answer 7

Change in thermal energy (Joules, J) = mass (Kilograms, kg) x specific heat capacity (Joules per kilogram per degree Celsius, J/kg°C) x temperature difference (Degree Celsius, °C)

Question 8

Letter equation for change in thermal energy?

Answer 8

ΔE = m x c x ΔT

Question 9

Word equation for power?

Answer 9

Power (Watts, W) = Energy transferred (Joules, J) / Time (Seconds, s)

Question 10

Letter equation for power?

Answer 10

P = E / t

Question 11

Word equation for power?

Answer 11

Power (Watts, W) = Work done (Joules, J) / Time (Seconds, s)

Question 12

Letter equation for power?

Answer 12

P = W / t

Question 13

Word equation for efficiency?

Answer 13

Efficiency = useful energy out / total energy in

Question 14

Word equation for efficiency?

Answer 14

Efficiency = useful power out / total power in