Physics - Equations Flashcards Preview

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Flashcards in Physics - Equations Deck (29):
1

Acceleration =

( final velocity - initial velocity ) divided by time
A= (v-u)/t
Unit= m/s (squared)

2

Resultant force =
(Newton’s Second Law)

Mass x Acceleration
F=ma
Unit = N, Newtons

3

Weight =

Mass x gravitational field strength
W=mg
Unit = N, Newtons

4

Momentum =

Mass x velocity
P=mv
Unit= kg m/s

5

Force =
(Momentum)

Changing in momentum divided by time
P= (mv-mu)/t
Unit = N, Newtons

6

Distance travelled =

Average speed x time
D= s x t
Unit= m

7

Change in gravitational potential energy =

Mass x gravitational field strength x change in height
(change in) GPE=mgh
Unit= J, Joules

8

Kinetic energy =

1/2 x mass x velocity squared
KE= 1/2 x m x v (squared)
Unit= J, Joules

9

Efficiency =

Useful energy in divided by total energy out times 100
OR
Useful power divided by total power times 100

10

Wave speed =

Frequency x wavelength
V= f x wavelength (upside down y )
OR
Distance/ time ( v= x/t )
Unit= m/s

11

Work done =

Force x distance moved in the direction of the force I
E= fd
(FED, Force = Work done x distance )
Unit= J, Joules

12

Power =

Work done divided by time taken
P= e/t
Unit= W, Watts

13

Energy transferred =
(Electrically)

Charge moved x potential difference (voltage)
E= Q x V
Unit= J,Joules

14

Potential difference (voltage)=

Current (amperes or amps) x resistance (ohms)
V= IR
Unit= V, Volts

15

Electrical power =

Current x voltage
P=IV
Unit= W,Watts

16

Energy transferred =

Current x velocity x time
E= IVT ( ITV)
Unit= J,Joules

17

Stopping distance =

Thinking distance + braking distance

18

Change in thermal energy =

Mass x specific heat capacity x temperature change
Q= m x c x °c
Unit= J,Joules

19

Thermal energy =

Mass x specific latent heat
Q= m x L
Unit= J,Joules

20

Time period =

1 divided by Frequency
1/f
Unit= s, seconds

21

Frequency =

1 divided by time
1/t
Units= Hz, Hertz

22

Speed =

Distance / time
V= x/t

23

Density=

Mass/volume
P= m/v
Units= g/cm(cubed) OR kg/m(cubed)

23

Final velocity - initial velocity =

2 x acceleration x distance
V squared - u squared = 2ax

24

Force =
(Magnets)

Magnetic flux density x current x length ( l )
F= B x I x l
Unit= N, Newtons

25

Force exerted on a spring=

Spring constant (N/m) x extension (m)
F= kx
Unit= N,Newtons

26

Energy transferred in stretching=

1/2 x spring constant x extension squared
E= 1/2 x k x x squared
Unit= J,Joules

27

Charge=

Current x time
Q= It
Unit= C,Coulombs

28

Electrical Power =

Current squared x Resistance
P= I^2 x R
Unit= Watts, W