formulas

Question 1

work done

Answer 1

work done = force x distance moved
wd = f x s

Question 2

gravitational potential energy

Answer 2

gpe = mgh

Question 3

kinetic energy

Answer 3

kinetic energy = 1/2 mass x speed squared
ke = 1/2 mv2

Question 4

elastic potential energy

Answer 4

elastic potential energy = 1/2 x spring constant x extension
epe = 1/2ke2

Question 5

efficiency

Answer 5

efficiency = useful output / total input

Question 6

power

Answer 6

power = energy transferred / time taken
p = E/t

Question 7

energy transferred

Answer 7

energy transferred = mass x specific heat capacity x temperature change
E = mc(triangle)t

Question 8

density

Answer 8

density = mass / volume
d = m/v
kg/m2

Question 9

pressure = force / area

Answer 9

p = F/A

Question 10

current

Answer 10

current = charge flowing / time
I - Q/t

Question 11

voltage

Answer 11

voltage = electric energy / charge
V = E/q

Question 12

resistance

Answer 12

resistance = voltage / current
V = IR

Question 13

power

Answer 13

power = voltage x current
P = IV

Question 14

Boyle’s law

Answer 14

pressure x volume = constant
PV = k

Question 15

weight

Answer 15

weight = mass x gravitational field strength
W = mg

Question 16

thermal energy for a change of state

Answer 16

thermal energy = mass x specific latent heat
E = mL

Question 17

wave speed

Answer 17

wave speed = frequency x wavelength
v = f (lambda)

Question 18

force

Answer 18

force = spring constant x extension
F = ke

Question 19

change in heat

Answer 19

change in heat = mass x specific latent heat
(triangle) heath = mL