# equations Flashcards Preview

## physics equations gcse edexcel > equations > Flashcards

Flashcards in equations Deck (28)
1
Q

charge

A

current x time

2
Q

acceleration

A

(v-u)/t

3
Q

speed

A

distance/time

4
Q

force

A

mass x acceleration

5
Q

wave speed

A

frequency x wavelength

6
Q

density

A

mass/volume

7
Q

pressure

A

force/area

8
Q

pressure difference

A

density x gravity x height

9
Q

power

A

current x voltage

10
Q

weight

A

mass x gravity

11
Q

moment

A

force x perpendicular distance

12
Q

force (springs)

A

spring constant x change in extension

13
Q

thermal energy

A

mass x shc x change in temperature

14
Q

GPE

A

mass x gravity x height

15
Q

work done

A

force x distance

16
Q

power (in terms of work done)

A

work done/time

17
Q

kinetic energy

A

1/2 x mass x (velocity)2

18
Q

momentum

A

mass x velocity

19
Q

force (in terms of momentum)

A

change in momentum/time taken for change

20
Q

(final velocity)2

A

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

21
Q

critical angle

A

sinC = 1/n (=refractive index)

22
Q

input and output voltage

A

V2/V1 = N2/N1

23
Q

pressure/temperature

A

P1/T1 = P2/T2

24
Q

degrees Celsius to kelvin

A

25
Q

refractive index

A

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

26
Q

efficiency

A

(useful energy output / total energy output) x 100

27
Q

pressure law (pressure and volume)

A

P1 x V1 = P2 x V2

28
Q

red shift

A

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