Physics Equations Flashcards by Lizzy Mills

Q

Force

A

Force = mass x acceleration

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Q

Average speed

A

Distance
————-
Time

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Q

Acceleration

A

Change in velocity (v-u)
———————————
Time

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Q

Weight

A

Weight = mass x gravitation field strength

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Q

Power

A

current x voltage

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Q

Voltage

A

current x resistance

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Q

Charge

A

current x time

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Q

Wave speed

A

frequency x wavelength

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Q

Refractive index (n)

A

sin(I)
N= ——-
sin(r)

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Q

Frequency

A

1
Frequency= ———
time period

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Q

Efficiency

A

useful energy output —————————-

total energy input

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Q

Work done

A

force x distance moved

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Q

Gravitational potential energy

A

GPE = mass x height x g

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Q

Kinetic energy

A

KE = 1/2 x mass x speed²

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Q

Energy transferred

A

Energy transferred = work done

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Q

Density

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A

Mass
Density = ———-
Volume

Q

Pressure

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A

Force
Pressure = ———-
Area

Q

Pressure difference

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A

= height x density x g

Q

For a transformer

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A

Input(P)voltage primary turns
——————— = ——————
Output(S)voltage secondary turns

Vp/Vs = Np/Ns

Q

Input power = output power

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A

For 100% efficiency

Vp x Ip = Vs x Is

Q

Electrical energy transferred

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A

Power x time

OR

Current x voltage x time. (Charge x voltage)

Q

Sin(critical angle)

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A

1/refractive index

Q

Efficiency equation

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A

(Useful energy output/ total input) x 100

Q

P1 x V1 =

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A

P2 x V2

Change in wavelength/reference wavelength

Velocity of a galaxy/speed of light