Equations

Question 1

W=mg

Answer 1

Weight = mass x Gravitational field strength

Question 2

W = F x s

Answer 2

Work done = Force x distance

Question 3

F = k x e

Answer 3

Force applied to string = Spring constant x extension

Question 4

s = v x t

Answer 4

Distance travelled = Speed x time

Question 5

a = v / t

Answer 5

Acceleration = Change in velocity / Time taken

Question 6

F = m x a

Answer 6

Resultant force = mass x acceleration

Question 7

p = m x v

Answer 7

Momentum = Mass x Velocity

Question 8

ke = 1/2 x m x v^2

Answer 8

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

Question 9

GPE = m x 10 x h

Answer 9

Gravitational Potential Energy = Mass x Gravitational Field Strength x Height

Question 10

P = e/t

Answer 10

Power = Energy transferred / Time

Question 11

P = W/t

Answer 11

Power = work done / time

Question 12

Efficiency

Answer 12

Efficiency = Useful output energy transfer / Total output energy transfer

Question 13

Efficiency

Answer 13

Efficiency = Useful power output / Total power output

Question 14

V = f x A ( funny looking

Answer 14

Wave speed = Frequency x Wave length

Question 15

Q = I x T

Answer 15

Charge Flow = current x time

Question 16

V = I x R

Answer 16

Potential Difference = current x resistance

Question 17

P = V x I

Answer 17

Power = Potential Difference x Current

Question 18

P = I^2 x R

Answer 18

Power = Current^2 x Resistance

Question 19

E = P x t

Answer 19

Energy Transferred = Power x time

Question 20

E = Q x V

Answer 20

Energy Transferred = Charge Flow x Potential Difference