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Flashcards in Equations Deck (31)
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1

Speed

Speed(m/s)=Distance(m)/time(s)

2

Acceleration

Acceleration(m/s2)= (final sped-initial speed)/time

3

Force

Force(N)= mass(kg) x acceleration(m/s2)

4

Weight

Weight(N)= mass(kg) x gravity(N/kg)

5

Momentum

Momentum(kg m/s)= mass(kg) x velocity(m/s)

6

Force (involving momentum)

Force(N)= change in momentum(kg m/s)/ time taken(s)

7

Moment

Moment(Nm)= Force(N) x distance from pivot(m)

8

Orbital speed

Orbital speed(km/s) = 2× π ×orbital radius(km)/time period(s)

9

Power (electricity module)

Power(W)= current(A) x Voltage(V)

10

Energy transferred

Energy transferred(J)= current(A) x Voltage(V) x Time(s)

11

Charge

Charge(C)= current(A) x time(s)
36000C= 36 kC

12

Voltage

Voltage(V)= current(A) x resistance (ohm)

13

Efficiency

Efficiency(%)=(useful energy transferred(J)/total energy transferred(J)) x 100

14

Graviational potential energy

Gravitational potential energy(J) = mass(kg) x height (m) x gravity(m/s2)

15

Work done

Work done(J)= Force(N) x distance(m)

16

Power (energy resources module)

Power(W or J/s)= work done(J)/ time taken(s)

17

Kinetic energy

Kinetic energy= 0.5 x mass(kg) x speed2(m/s)

18

Potential Energy

Potential energy=mass x height x gravity(force x distance)

19

pressure in a solid

pressure (n/cm2 or Pa) = force (n) / surface area (cm2 or m2)

20

pressure in a liquid

pressure(Pa) = height (m) x density of fluid (kg/m3) x gravtational field strength (10)

21

density

density kg/m3 = mass (kg) / volume (m3)

22

volume of a sphere

(4/3) x pie r3

23

wave speed

wave speed (m/s) = wave length (m) x frequency (hz)

24

(waves module) frequency

frequency (hz) = 1/time period (s)

25

(waves module) time period

time period (s) = 1/ frequency (hz)

26

snell's law

n (refractive index) = sin(i)/sin(r)

27

critical angle

sin(c) (critical angle) = 1/n (refractive index)

28

pressure and volume at a constant temperature

P(1) x V(1) = P(2) x V(2)

29

pressure and temperature at constant volume

P(1)/ T(1) = P(2)/T(2)

30

Voltage and turns in transformers

V(p)/V(s) = N(p)/N(s)