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31 Cards in this Set
- Front
- Back
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Speed
(s) |
Distance/Time
(d/t) |
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Acceleration
(a) |
final (velocity-initial velocity)/time
[(v-u)/t] |
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Weight
(N) |
Mass*grams
(m*g) |
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[For a spring constant]
Force (F) |
Constant*extension
(k*x) |
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Pressure
(Pascals) |
Force/Area
(F/A) |
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Kinetic Energy
(K.E.) |
1/2mass*velocity(squared)
(1/2mv2) |
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Potential energy
(P.E.) |
mass*gravitational pull of earth (9.8)*height
(mgh) |
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Effeciency
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Useful energy output/Energy input * 100%
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Work done
(W) |
Force*distance
(F/d) |
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Power
(P - Watts) |
Energy/time
(E - Joules/t) |
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Pressure change
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CONSTANT : Pressure*Volume
(p*V) |
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Thermal capacity (Energy)
(E) |
mass* specific heat capacity * change in temperature
(McΔt) Specific heat capacity : Amount of energy needed to raise 1kg of a substance by 1 degree celsius Δ = delta, change |
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ELECTROMAGNETIC SPECTRUM (LEAST-->MOST)
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Radio - Micro - Infrared - Visible light - Ultraviolet - X-rays - Gamma rays
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WAYS OF TRANSFERRING HEAT
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CONDUCTION - Solids, heat moves fastest because particles close together
CONVECTION - Liquids and gases, May move slower, remember that hot water/gas rises and cold will fall. This may create a convectional current RADIATION : Needs no medium to travel through. radiation from sun includes infrared. can travel through vacuums |
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TRANSVERSE WAVE (+example)
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Water (wave moves up and down)
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LONGITUDINAL WAVE
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Sound (wave moves like a slinky)
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How a wave can be reflected off a plane barrier (3 ways)
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Reflection : bounces off and moves back, usually stays in the same medium.
Refraction : Bending when reaching a new medium for example shouting into a table. If the sound wave is not perpendicular to the new medium then it will slow down/speed up depending on density of the substance (same principal for going out of the substance) Defraction : A plane barrier with a small hole in the middle. When sound waves reach this, the wave will go through the hole and come out with semi circular waves. |
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Velocity (wavelength equation)
(V) |
Frequency*Wavelength
(f*λ) λ - Lambda - wavelength |
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Law for reflection of light
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Angle of incidence = Angle of reflection
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Critical angle
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When reflection of an object across into a denser material turns into refraction*
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Human range of audible frequencies
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20-20 000Hz
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Current
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Charge per unit in one second
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Potential difference
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How much energy from one coloumb of charge is changed
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emf (electromotive force)
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Energy supplied by a source in driving charge round a complete circuit
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Electric field
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A region in which an electric charge experiences a force
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Resistance
(r) |
Voltage = Current*Resistance
V=Ir |
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Current
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Current = Charge/time
(I=Q/t) |
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Conventional current goes...
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Positive to Negative
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Power
Energy |
Power = Current*Voltage (P=C*V)
Energy = Current*voltage*time (P=C*V*t) |
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Transformers
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Volts on primary coil/volts on secondary coil = Number of turns on primary coil/number of turns on secondary coil
Vp/Vs = Np/Ns |
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Transformers (100% effeciency)
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VpIp = VdIs
Volts on primary*current on primary = Volts on secondary*current on secondary |
