GCSE Equations

Question 1

Equation for weight

Answer 1

weight = mass x gravitational field strength

Question 2

Equation for work done

Answer 2

work done = force x distance

Question 3

Equation for force applied to a string

Answer 3

force applied = spring constant x extension

Question 4

Equation for the moment of a force

Answer 4

moment of a force = force x distance

Question 5

Equation for pressure

Answer 5

pressure = force normal to surface / area of surface

pressure = force / area

Question 6

Equation for speed

Answer 6

speed = distance / time

Question 7

Equation for acceleration

Answer 7

acceleration = change in velocity / time taken

Question 8

Equation for resultant force

Answer 8

resultant force = mass x acceleration

Question 9

Equation for momentum

Answer 9

momentum = mass x velocity

Question 10

Equation for kinetic energy

Answer 10

kinetic energy = 0.5 x mass x (speed)²

Question 11

Equation for gravitational potential energy

Answer 11

GPE = mass x gravitational field strength x height

Question 12

Equation for efficiency

Answer 12

efficiency = useful output / total input

Question 13

Equation for wave speed

Answer 13

wave speed = frequency x wavelength

Question 14

Equation for charge flow

Answer 14

charge flow = current / time

Question 15

Equation for potential difference

Answer 15

potential difference = current x resistance

Question 16

Equation for density

Answer 16

density = mass / volume

Question 17

All equations for energy transferred (2)

Answer 17

energy transferred = power x time

energy transferred = potential difference x charge flow

Question 18

All equations for power (4)

Answer 18

power = work done / time taken

power = energy transferred / time taken

power = resistance x (current)²

power = potential difference x current