Required Physics Equations

Question 1

Kinetic energy

Answer 1

E = ½ x m x v²

Energy = ½ x Mass x Velocity²

Question 2

Elastic potential energy

Answer 2

E = ½ x k x e²

Energy = ½ x Spring constant x Extension²

Question 3

Gravitational potential energy

Answer 3

E = m x g x h

Energy = Mass x Gravitational constant x Height

Question 4

change in thermal energy

Answer 4

ΔE = m x c x Δθ

Change in energy = Mass x Specific heat capacity x Change in temperature

Question 5

Work done (by a force)

Answer 5

W = F x D

Work = Force x Distance

Question 6

Power (energy and time)

Answer 6

P = E ÷ t

Power (W) = Energy transferred (J) ÷ Time (s)

Question 7

Voltage (current and resistance)

Answer 7

V = I x R

Voltage = Current x Resistance

Question 8

Current (coulombs and time)

Answer 8

I = Q ÷ t

Current = Coulombs ÷ Time

Question 9

Energy transferred in a circuit

Answer 9

E = Q x V

Energy transferred = Coulombs x Voltage

Question 10

Power (current and voltage)

Answer 10

P = V x I

Power = Voltage x Current

Question 11

Power (current and resistance)

Answer 11

P = I² x R

Power = Current² x Resistance

Question 12

Frequency of alternating current

Answer 12

Frequency = 1 (s) ÷ Interval time (s)

Question 13

Density

Answer 13

D = M ÷ V

Density = Mass (kg) ÷ Volume (m³)

Question 14

Specific latent heat

Answer 14

E = M x L

Energy (for a change of state) = Mass (kg) x Specific Latent Heat

Question 15

Gas pressure

Answer 15

p x V = k

Pressure (Pa) x Volume (m³) = Constant
only if the temperature remains constant