Equations to know

Question 1

Equation for density

Answer 1

Density = Mass/Volume

Question 2

Change in thermal energy

Answer 2

Mass x SHC x Temperature change

Question 3

Thermal energy for a CHANGE OF STATE

Answer 3

Mass x Specific latent heat

Question 4

Kinetic energy

Answer 4

KE = 0.5 x mass x speed squared

Question 5

GPE

Answer 5

Mass x Gravitational field strength x height

Question 6

Power, energy, and time

Answer 6

Power = Energy transferred/Time

Question 7

Efficiency energy transfer

Answer 7

Useful output energy transfer/Total input energy transfer

Question 8

Efficiency power

Answer 8

Useful power output/Total power input

Question 9

Electrical current (charge flow)

Answer 9

Charge flow = Current x Time

Question 10

Potential difference, current, resistance

Answer 10

Potential difference = Current x Resistance

Question 11

Power, potential difference, current

Answer 11

Power = Potential difference x Current

Question 12

Power, current, resistance

Answer 12

Power = current squared x resistance

Question 13

Energy transferred, power, time

Answer 13

Energy transferred = Power x Time

Question 14

Energy transferred, charge flow, potential difference

Answer 14

Energy transferred = Charge flow x Potential difference

Question 15

Power, work done, time

Answer 15

Power = Work done/Time

Question 16

Equation for weight

Answer 16

Weight = Mass x Gravitational field strength

Question 17

Work done

Answer 17

Work done = Force x distance

Question 18

Force applies to a spring

Answer 18

= 0.5 x spring constant x extension

Question 19

Distance travelled

Answer 19

Speed x time

Question 20

Acceleration =

Answer 20

Change in velocity / time taken

Question 21

Resultant force

Answer 21

Mass x acceleration

Question 22

Momentum

Answer 22

Mass x velocity

Question 23

wave speed

Answer 23

frequency x wavelength