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31 Cards in this Set
- Front
- Back
Speed
(s) |
Distance/Time
(d/t) |
|
Acceleration
(a) |
final (velocity-initial velocity)/time
[(v-u)/t] |
|
Weight
(N) |
Mass*grams
(m*g) |
|
[For a spring constant]
Force (F) |
Constant*extension
(k*x) |
|
Pressure
(Pascals) |
Force/Area
(F/A) |
|
Kinetic Energy
(K.E.) |
1/2mass*velocity(squared)
(1/2mv2) |
|
Potential energy
(P.E.) |
mass*gravitational pull of earth (9.8)*height
(mgh) |
|
Effeciency
|
Useful energy output/Energy input * 100%
|
|
Work done
(W) |
Force*distance
(F/d) |
|
Power
(P - Watts) |
Energy/time
(E - Joules/t) |
|
Pressure change
|
CONSTANT : Pressure*Volume
(p*V) |
|
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 |
|
ELECTROMAGNETIC SPECTRUM (LEAST-->MOST)
|
Radio - Micro - Infrared - Visible light - Ultraviolet - X-rays - Gamma rays
|
|
WAYS OF TRANSFERRING HEAT
|
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 |
|
TRANSVERSE WAVE (+example)
|
Water (wave moves up and down)
|
|
LONGITUDINAL WAVE
|
Sound (wave moves like a slinky)
|
|
How a wave can be reflected off a plane barrier (3 ways)
|
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. |
|
Velocity (wavelength equation)
(V) |
Frequency*Wavelength
(f*λ) λ - Lambda - wavelength |
|
Law for reflection of light
|
Angle of incidence = Angle of reflection
|
|
Critical angle
|
When reflection of an object across into a denser material turns into refraction*
|
|
Human range of audible frequencies
|
20-20 000Hz
|
|
Current
|
Charge per unit in one second
|
|
Potential difference
|
How much energy from one coloumb of charge is changed
|
|
emf (electromotive force)
|
Energy supplied by a source in driving charge round a complete circuit
|
|
Electric field
|
A region in which an electric charge experiences a force
|
|
Resistance
(r) |
Voltage = Current*Resistance
V=Ir |
|
Current
|
Current = Charge/time
(I=Q/t) |
|
Conventional current goes...
|
Positive to Negative
|
|
Power
Energy |
Power = Current*Voltage (P=C*V)
Energy = Current*voltage*time (P=C*V*t) |
|
Transformers
|
Volts on primary coil/volts on secondary coil = Number of turns on primary coil/number of turns on secondary coil
Vp/Vs = Np/Ns |
|
Transformers (100% effeciency)
|
VpIp = VdIs
Volts on primary*current on primary = Volts on secondary*current on secondary |