Formulas

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26 Terms

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average speed

average speed = distance moved/time taken

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acceleration

a = (v-u)/t

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relationship between final speed, initial speed, acceleration, and distance moved

v² = u²+2as

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relationship between unbalanced force, mass, and acceleration

f = ma

5
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relation between weight, mass, and gravitational fieldstrength

w = mg

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relationship between power, current, and voltage

p = iv

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relationship between energy transferred, current, voltage, and time

e = ivt

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voltage, current, resistance

v = ir

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relationship between charge, current, and time

q = it

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relationship between energy transferred, charge, and voltage

e = qv

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wave speed

v = f x lambda (wavelength)

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frequency and time period

f = 1/t

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refractive index

n = sin i x sin r

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critical angle

sin c = 1/n

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efficiency

efficiency = useful energy output/total energy output x 100%

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Work done

W = fd

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GPE

GPE = mgh

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KE

KE = 1/2mv²

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Power, work done, time taken

p = w/t

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density

density = mass/volume

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pressure

p = f/a

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pressure difference

pressure difference = height x density x gravitational fieldstrength

23
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Boyle’s law (with conditions)

For a fixed mass of gas at a constant temperature, p1v1 = p2v2

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Pressure Law (with conditions)

At a constant mas and volume of gas, p1/t1 = p2/t2

25
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orbital speed, orbital radius, time period

v = 2Ď€r/t

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