# Physics Equations

• Created by: Bertie
• Created on: 18-03-18 13:45
momentum
= mass x velocity
1 of 30
momentum before
= momentum after
2 of 30
force
= change in momentum/time taken
3 of 30
orbital speed
= 2 x pi x radius/ time period
4 of 30
secondary voltage/primary voltage
= secondary turns/primary turns
5 of 30
critical angle
= 1/refractive index
6 of 30
refractive index1 x sin(< incidence)
= refractive index2 x sin(< refraction)
7 of 30
refractive index
= speed of light in vacuum/speed of light in material
8 of 30
angle of incidence
= angle of reflection
9 of 30
wave speed
= frequency x wavelength
10 of 30
frequency
= 1/ time period
11 of 30
total anti-clockwise moments
= total clockwise moments
12 of 30
weight
= mass x gravitational field strength
13 of 30
moment
= force x perpendicular distance from the pivot
14 of 30
activity
= count rate/ time
15 of 30
resistance
= voltage/current
16 of 30
charge
= current x time
17 of 30
energy transferred
= voltage x charge ( charge = current x time)
18 of 30
power
= current x voltage
19 of 30
power of heating element
= current x voltage OR current2 x resistance
20 of 30
power
= work done/time taken
21 of 30
work done
= force x distance moved
22 of 30
efficiency
= useful energy output/total energy input
23 of 30
force
= mass x acceleration
24 of 30
stopping distance
= thinking distance + braking distance
25 of 30
kinetic energy
= 1/2 x mass x velocity2
26 of 30
gravitational potential energy
= mass x gravitational field strength x height
27 of 30
speed
= distance/time
28 of 30
velocity
= displacement/time
29 of 30
acceleration
change in velocity/ time taken
30 of 30

## Other cards in this set

momentum before

= momentum after

force

orbital speed

### Card 5

#### Front

secondary voltage/primary voltage