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27 Cards in this Set
- Front
- Back
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Acceleration |
Change in Velocity/Time a= (v - u) / t |
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Average speed |
Distance/Time s = d/t |
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Velocity |
The speed of a body is the rate of change of the distance that it moves. v = d/t velocity = speed |
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Force (Hooke's law) |
Spring constant - displacement spring's end f= k x |
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Force |
mass x acceleration (rate of change of momentum.) (mv - mu)/t |
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Refractive index |
n = (speed of light in vacuum)/ (speed of light in medium) n = (sin i )/(sin r) i= incident ray r= refractive ray |
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Efficiency |
(useful energy output)/(energy input)x 100% |
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Change in mometum |
Force x time (mv - mu) = F x t. |
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Momentum |
force x velocity p = m x v |
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kinetic energy |
1/2 x mass x (velocity)² KE = ½mv² |
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Change in GPE |
mass x gravity x change in height GPE= mgh |
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Energy |
ΔPE = ΔV x Q ΔPE = P x t |
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Pressure
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Force/ Area Pa = N/m (liquid)= Depth x Density x 10 m/s² p = hρg |
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Density |
mass ÷ volume d = m ÷ v |
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Moment |
force x perpendicular distance from pivot. m = F x d. |
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Weight |
weight = mass x gravity w = m x g |
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Potential difference |
current x resistance v=ir |
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Resistance |
change in voltage / current R = ΔV / I |
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Charge |
current x time Q = I x t. |
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Energy |
energy = voltage x charge E = V x Q energy = voltage x current x time E = V x I x t |
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Transformers |
primary voltage / secondary voltage = turns on primary / turns on secondary Vp/Vs = Np/Ns |
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Power |
power = voltage x current P = V x I |
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Velocity (Waves) |
frequency x wavelength v = f x λ. |
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Work done |
voltage x charge W = V x Q |
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Change in work |
ΔW = Fd= ΔE |
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Current |
charge/ time I = Q / t change in voltage/ resistance I = ΔV / R |
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Boyle’s law |
Pressure1 x Volume1 = Pressure2 x Volume 2 P1V1 =P2V2 |
