Gcse Physics Equations

Question 1

Weight

Answer 1

Weight = mass x gravitational field strength

W=mg

Question 2

Force in spring

Answer 2

Force on a spring = spring constant x extension

F=ke

Question 3

Acceleration

Answer 3

Acceleration = change in velocity / time

a = change in v/t

Question 4

Gravitational potential energy

Answer 4

Gravitational potential energy = mass x gravitational field strength x height

E = mgh

Question 5

Power using work done

Answer 5

Power = Work done / time

P = W/t

Question 6

Efficiency

Answer 6

Efficiency = useful energy / total energy

Question 7

Charge flow

Answer 7

Charge flow = current x time

Q = It

Question 8

Power using potential difference

Answer 8

Power = potential difference x current

P = VI

Question 9

Density

Answer 9

Density= mass/volume

P = m/v

Question 10

Work done

Answer 10

Work done = force x distance

W = Fs

Question 11

Distance travelled

Answer 11

Distance travelled = speed X time

s = vt

Question 12

Resultant force

Answer 12

Resultant force = mass x acceleration

F = ma

Question 13

Kinetic energy

Answer 13

Kinetic energy = 0.5 X Mass X (speed)^2

E = 1/2 mv^2

Question 14

Power

Answer 14

Power = energy transferred / time

P = E/t

Question 15

Efficiency

Answer 15

Efficiency = useful, energy, output/total energy, input

Question 16

Potential difference

Answer 16

Potential difference = current X resistance

V =IR

Question 17

Resistance

Answer 17

resistance = current^2 / power

R = I^2 / P

Question 18

Pressure

Answer 18

Pressure = force normal to the surface/area of the surface

P= F/A

Question 19

Moment of a force

Answer 19

Moment of a force = force X distance

M = Fd

Question 20

Energy transferred

Answer 20

Energy transferred = charge flow x potential difference

E = QV