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Physics Formulas > Formulas > Flashcards

Formulas Flashcards

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1
Q

If transformers are 100% efficient, give the formula

A

Ip x Vp = Is x Vs
s - secondary
p - primary

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2
Q

Refractive index

A

Speed of light in a medium\
Speed of light in a vacuum

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3
Q

Resistors in parallel

A

1/ R total = 1/ R1 + 1/ R2

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4
Q

Spring constant

A

K = F/X

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5
Q

Transformers

A

Vs / Vp = Ns / Np

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6
Q

Efficiency

A

Useful output / total input

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7
Q

Kinetic energy

A

1/2 mass x velocity squared

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8
Q

Impulse of a force

A

FT = MV - MU
U - initial velocity
V - final velocity

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9
Q

Power

A

P = W/T
W - work done
T - time taken

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10
Q

Wave speed

A

Frequency x wavelength

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11
Q

Boyles law

A

p1 x v1 = p2 x v2

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12
Q

Force

A

Mass x acceleration

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13
Q

Law of reflection

A

Angle of incidence = angle of reflection

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14
Q

Pressure in a liquid

A

Density x gravity x height

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15
Q

Momentum

A

Mass x velocity

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16
Q

Weight

A

Mass x gravitational field strength
Gravitational field strength - 10

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17
Q

Refractive index

A

Sin i / sin r

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18
Q

Frequency of a wave

A

Occurrences \ time period

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19
Q

Acceleration

A

(V - U) / t

20
Q

Moment of a force

A

Mass x perpendicular distance from pivot

21
Q

Specific heat capacity

A

Change in thermal energy = mass x specific heat capacity x change in temperature

22
Q

Pressure

A

Force /area

23
Q

Work done

A

Force x distance

24
Q

Density

A

Mass /volume

25
Q

Gravitational Potential energy

A

Mass x gravity x height

26
Q

Critical angle

A

sin C = 1/ refractive index

27
Q

Resistance

A

Voltage / current

28
Q

Resistors

A

R = R1 + R2

29
Q

Velocity

A

Distance / time

30
Q

Principle of moments

A

Total clockwise moments = total anti-clockwise moments

31
Q

Wave frequency

A

Number of waves / time taken

32
Q

Orbital speed

A

(2 x pie x radius) / time

33
Q

Current formula

A

Charge / time

34
Q

SI unit for energy transfer

A

J/s

35
Q

hubble constant

A

v = HOd

36
Q

acceleration due to gravity on earth

A

9.8 m/s squared

37
Q

time period

A

1 / frequency

38
Q

power

A

energy / time

39
Q

voltage

A

I x R remember VIR for resistance aswell

40
Q

energy transferred

A

I x V x t

41
Q

gravitational acceleration (gravity)

A

9.8, NOT 10

42
Q

hubbles constant

A

2.2 x 10^-18

43
Q

thermal energy

A

m x c x change in t

44
Q

the conservation of momentum

A

m1u1 + m2u2 = m1v1 + m2v2

45
Q

the equation that links gravitational potential energy and kinetic energy

A

Decrease in PE= Increase in KE
increase in PE = decrease in KE

46
Q

snells law

A

n1 sin θ1= n2 sinθ2

Physics Formulas (1 decks)

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