Equations

Question 1

Weight

Answer 1

weight = mass x gravitational field strength

W = m g

Question 2

Work Done

Answer 2

work done = force x distance

W = F s

Question 3

Force on a string

Answer 3

spring constant x extension

F = k e

Question 4

Moment

Answer 4

moment of a force = force x distance

M = F d

Question 5

Pressure

Answer 5

pressure = force normal to a surface / area of that surface

p = F / A

Question 6

Distance

Answer 6

distance travelled = speed x time

s = v t

Question 7

Acceleration

Answer 7

acceleration = change in velocity / time taken

a = delta v / t

Question 8

Resultant Force

Answer 8

resultant force = mass x acceleration

F = m a

Question 9

Momentum

Answer 9

momentum = mass x velocity

p = m v

Question 10

Kinetic Energy

Answer 10

kinetic energy = 1/2 x mass x (speed)^2

Ek = 1/2 m v^2

Question 11

Gravitational Potential Energy

Answer 11

gravitational potential energy = mass x gravitational field strength x height

Ep = m g h

Question 12

Power (Electricity)

Answer 12

power = (current)^2 x resistance

P = (I)^2 R

power = potential difference x current

P = V I

Question 13

Power (Work Done)

Answer 13

power = work done / time

Question 14

Wave Speed

Answer 14

wave speed = frequency x wavelength

v = f x a (not “a” but that’s closest)

Question 15

Charge Flow

Answer 15

charge flow = charge x time

Q = I t

Question 16

Potential Difference

Answer 16

potential difference = current x resistance

V = I R

Question 17

Energy Transferred

Answer 17

energy transferred = charge flow x potential difference

E = Q V

energy transferred = power x time

E = p t

Question 18

Density

Answer 18

density = mass / volume

p = m / v