equations

Question 1

charge

Answer 1

current x time

Question 2

acceleration

Answer 2

(v-u)/t

Question 3

speed

Answer 3

distance/time

Question 4

force

Answer 4

mass x acceleration

Question 5

wave speed

Answer 5

frequency x wavelength

Question 6

density

Answer 6

mass/volume

Question 7

pressure

Answer 7

force/area

Question 8

pressure difference

Answer 8

density x gravity x height

Question 9

power

Answer 9

current x voltage

Question 10

weight

Answer 10

mass x gravity

Question 11

moment

Answer 11

force x perpendicular distance

Question 12

force (springs)

Answer 12

spring constant x change in extension

Question 13

thermal energy

Answer 13

mass x shc x change in temperature

Question 14

GPE

Answer 14

mass x gravity x height

Question 15

work done

Answer 15

force x distance

Question 16

power (in terms of work done)

Answer 16

work done/time

Question 17

kinetic energy

Answer 17

1/2 x mass x (velocity)2

Question 18

momentum

Answer 18

mass x velocity

Question 19

force (in terms of momentum)

Answer 19

change in momentum/time taken for change

Question 20

(final velocity)2

Answer 20

(initial velocity)2 + (2 x acceleration x displacement)

Question 21

critical angle

Answer 21

sinC = 1/n (=refractive index)

Question 22

input and output voltage

Answer 22

V2/V1 = N2/N1

Question 23

pressure/temperature

Answer 23

P1/T1 = P2/T2

Question 24

degrees Celsius to kelvin

Answer 24

add 273

Question 25

refractive index

Answer 25

sin i (incident ray) / sin r (refractive ray)

Question 26

efficiency

Answer 26

(useful energy output / total energy output) x 100

Question 27

pressure law (pressure and volume)

Answer 27

P1 x V1 = P2 x V2

Question 28

red shift

Answer 28

change in wavelength / reference wavelength = velocity of a galaxy / speed of light (3x10^8)