Equations Flashcards

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1
Q

Speed

A

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

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2
Q

Acceleration

A

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

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3
Q

Force

A

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

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4
Q

Weight

A

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

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5
Q

Momentum

A

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

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6
Q

Force (involving momentum)

A

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

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7
Q

Moment

A

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

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8
Q

Orbital speed

A

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

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9
Q

Power (electricity module)

A

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

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10
Q

Energy transferred

A

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

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11
Q

Charge

A
Charge(C)= current(A) x time(s)
36000C= 36 kC
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12
Q

Voltage

A

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

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13
Q

Efficiency

A

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

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14
Q

Graviational potential energy

A

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

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15
Q

Work done

A

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

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16
Q

Power (energy resources module)

A

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

17
Q

Kinetic energy

A

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

18
Q

Potential Energy

A

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

19
Q

pressure in a solid

A

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

20
Q

pressure in a liquid

A

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

21
Q

density

A

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

22
Q

volume of a sphere

A

(4/3) x pie r3

23
Q

wave speed

A

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

24
Q

(waves module) frequency

A

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

25
Q

(waves module) time period

A

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

26
Q

snell’s law

A

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

27
Q

critical angle

A

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

28
Q

pressure and volume at a constant temperature

A

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

29
Q

pressure and temperature at constant volume

A

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

30
Q

Voltage and turns in transformers

A

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

31
Q

input power and out put power in transformers

A

V(p) x I(p) = V(s) x I(s)