Physics Required Equations

Question 1

Weight = mass x gravitational field strength

Answer 1

w = mg

Question 2

Work done = force x distance along the line of action of the force

Answer 2

w = Fs

Question 3

Force applied to a spring = spring constant x extension

Answer 3

F = ke

Question 4

Distance travelled = speed x time

Answer 4

s = vt

Question 5

Acceleration = change in velocity / time taken

Answer 5

a = ^v / t

^ = triangle = ‘change in’

Question 6

Resultant force = mass x acceleration

Answer 6

F = ma

Question 7

Momentum = mass x velocity

Answer 7

p = mv

Question 8

Kinetic energy = 0.5 x mass x speed*2

Answer 8

Ek = 0.5 m v*2

Question 9

Gravitational potential energy = mass x gravitational field strength x height

Answer 9

Ep = 0.5 mgh

Question 10

Power = energy transferred / time

Answer 10

P = e/t

Question 11

Power = work done / time

Answer 11

P = w/t

Question 12

Efficiency = useful output energy transfer / input energy transfer

Answer 12

Efficiency = useful power output / total power input

Question 13

Wave speed = frequency x wavelength

Answer 13

Wave speed = frequency x wavelength

Question 14

Charge flow = current x time

Answer 14

Q = it

Question 15

Potential difference = current x resistance

Answer 15

V = IR

Question 16

Power = potential difference x current

Answer 16

P = Vi

Question 17

Power = current*2 x resistance

Answer 17

P = i *2 R

Question 18

Energy transferred = power x time

Answer 18

E = pt

Question 19

Energy transferred = charge flow x potential difference

Answer 19

E = QV

Question 20

Density = mass / volume

Answer 20

P = m/v