Physics equations

Question 1

Weight

Answer 1

Weight = mass x gravitational field strength

Question 2

Work done

Answer 2

Work done = force x distance

Question 3

Force applied to spring

Answer 3

Force applied to spring = spring constant x extension

Question 4

Kinetic energy

Answer 4

Kinetic energy = 0.5 x mass x (velocity) squared

Question 5

Gravitational potential energy

Answer 5

Gravitational potential energy = mass x gravitational field strength x height

Question 6

Power in terms of energy

Answer 6

Power = energy transferred / time

Question 7

Power in terms of work done

Answer 7

Power = work done / time

Question 8

Efficiency in terms of energy

Answer 8

Efficiency = useful output energy transferred / total input energy transferred

Question 9

Efficiency in terms of power

Answer 9

Efficiency = useful power output / total power input

Question 10

Energy transferred

Answer 10

Energy transferred = power x time

Question 11

Density

Answer 11

Density = mass / volume

Question 12

Elastic potential energy

Answer 12

Elastic potential energy = 0.5 × spring constant × (extension) squared

Question 13

Change in thermal energy

Answer 13

Change in thermal energy = mass x specific heat capacity x temperature change

Question 14

Thermal energy for a change of state

Answer 14

Thermal energy for a change of state = mass × specific latent heat