Key Physics Formulae

Question 1

Distance traveled =

Answer 1

Distance traveled = average speed x time

Question 2

Acceleration =

Answer 2

Acceleration = Change in velocity/time taken
A = (v-u)/t

Question 3

Force =

Answer 3

Force = mass x acceleration
F = m x a

Question 4

Weight =

Answer 4

Weight = mass x gravitational field strength 
W = m x g

Question 5

Efficiency =

Answer 5

Efficiency = (useful energy transferred by device) / (total energy supplied to device)

Question 6

Momentum =

Answer 6

Momentum = mass x velocity 
p = m x v

Question 7

Wave speed = (2)

Answer 7

Wave speed = frequency x wavelength
V = f x -\ (lambda)

Wave speed = distance / time
V = x/t

Question 8

Density =

Answer 8

Density = mass/volume

P = m/V

Question 9

Work done=

Answer 9

Work done = force x distance moved in direction of force

E = F x d

Question 10

Change in GPE =

Answer 10

Change in GPE = Mass x gravitational field strength x change in vertical height

/\GPE = m x g x /\h

Question 11

Kinetic energy =

Answer 11

Kinetic energy = 0.5 x mass x (velocity)^2

KE = 0.5 x m x v^2

Question 12

Power = (2)

Answer 12

Power = work done / time taken 
P = E/t

Power = energy transferred/ time taken 
P = E/t

Question 13

Energy transferred =

Answer 13

Energy transferred = charge moved x potential difference

E = Q x V

Question 14

Charge =

Answer 14

Charge = current / time

Q= I x t

Question 15

Potential difference =

Answer 15

Potential difference = current x resistance

V = I x R

Question 16

Electrical power = (2)

Answer 16

Electrical power = current x potential difference
P = I x V

Electrical power = current^2 x resistance
E = I^2 x R

Question 17

Force exerted on a spring =

Answer 17

Force exerted on a spring = spring constant x extension

F = k x x

Question 18

Moment of a force =

Answer 18

Moment of a force = force x distance normal to the direction of the force

Question 19

Pressure =

Answer 19

Pressure = force normal to surface / area of that surface

P = F/A