# physics equations

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• Created by: Eli820
• Created on: 17-10-23 20:12
speed
v = d/t
velocity=distance/time taken
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acceleration
a = Dv/t
acceleration= change in velocity/time taken
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Density
r = m/V
density =mass/ volume
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Force
F=ma
Force=mass x acceleration
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work done
W = Fs
work done = force x distance moved in the direction of that force
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momentum
p = mv
momentum = mass x velocity
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power
P = E/t
power = energy transferred/time taken
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power
P = W/t
power = work done/time taken
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weight
W=mg
weight = mass x gravitational field
strength
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Kinetic Energy
EK= 1/2mv2
kinetic energy = 0.5 x mass x (velocity squared)
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change in gravitational potential energy
DGPE = mgDh
change in gravitational potential energy = mass x gravitational field strenth x difference in height
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Pressure
P = F/A
pressure = force applied/contact area
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Gas Law
pV = nRT
Gas Law: pressure x volume of a gas = number of moles x molar gas constant x absolute temperature
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Gas Law
P1V1 = P2V2
T1 T2
NB Temperature MUST be in Kelvin
Gas Law: combination of Boyle's Law and Charles' Law
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Charge
DQ = IDt
charge = current x time
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Ohm's Law
V = IR
Ohm's Law: Potential difference = current x resistance
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Ohm's Law Law applied to the full circuit
EMF = I(R + r)
Ohm's Law applied to the full circuit: Electromotive force = current x (sum of the circuit resistance and the internal resistance of the cell)
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Power
P = I V
power = current x potential difference
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energy transferred in a component
W = QV
energy transferred in a component = charge passing through it x potential difference acorss it
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resistance
R = r x l/A
resistance = resistivity x length
cross sectional area
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Wavespeed
v = fl
for electromagnetic radiation v = c giving:
c = fl
wavespeed = frequency x wavelength
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Centripetal force
FC = mv2/r
centripetal force = mass x speed2 / radius of path
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Electrical energy changed into heat
E = VI t
Electrical energy changed into heat = potential difference x current x time
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Inverse square law for force on a mass in a gravitational field of another mass
FG = - G m1 m2/r2
Inverse square law for force on a mass in a gravitational field of another mass: Force is proportional to the product of the masses and inversely proportional to the square of the dista
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Inverse square law for force on a charge in an electric field of another charge
FE= 1 Q1 Q2
4pe0 r2
NB the overall sign indicating wherther it is attractive (negative) or repulsive (positive) comes from the signs of the charges.
Also, although the constant of proportionality is complex it is a similar relationship to ab
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Capacitance
C = Q/V
capacitance = charge stored /potential difference
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ratio of the voltages across the coils of a transformer
V1 = N1
V2 N2
NB the 1 could be P for primary and the 2 could be s for secondary - it doesn't matter which is which!
ratio of the voltages across the coils of a transformer = the ratio of the turns on the coils
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## Other cards in this set

### Card 2

acceleration

#### Back

a = Dv/t
acceleration= change in velocity/time taken

Density

Force

work done