PHYSICS

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  • Created by: Shay8200
  • Created on: 06-08-18 20:37
T1.What are the different energy stores?
Thermal, Kinetic, Gravitational Potential, Elastic Potential, Chemical, Magnetic, Electrostatic, Nuclear
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T1.How is energy transferred?
Mechanically(by a force doing work), electrically(work done by moving charges), by heating or by radiation.
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T1.How do you calculate Kinetic energy(J)?
0.5 x mass(kg) x speed²(m/s)²
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T1.How do you calculate Gravitational Potential energy(J)?
Mass(kg) x Gravitational Field Strength(N/kg) x Height(m)
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T1.How do you calculate Elastic Potential Energy(J)?
0.5 x Spring Constant(N/m) x Extension²(m)²
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T1.What does Specific Heat Capacity mean?
AMOUNT of ENERGY NEEDED to RAISE THE TEMPERATURE OF 1KG OF A SUBSTANCE BY 1°C
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T1.How do you calculate CHANGE IN THERMAL ENERGY(J)?
Mass(kg) x Specific Heat Capacity(J/kg°C) x Temperature Change(°C)
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T1.How does Energy move?
Energy can be TRANSFERRED USEFULLY, STORED OR DISSIPATED(wasted). BUT NEVER CREATED OR DESTROYED.
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T1.What does Power mean?
RATE of ENERGY TRANSFER or RATE of DOING WORK
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T1.What are the 2 equations that calculate POWER(W)?
Energy Transferred(J) ÷Time(s) & Work Done(J)÷Time(s)
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T1.What is CONDUCTION(mainly in solids)?
Process-VIBRATING PARTICLES TRANSFER ENERGY to NEIGHBOURING PARTICLES
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T1.What is CONVECTION(mainly in liquids and gases)?
Where ENERGETIC PARTICLES MOVE AWAY from HOTTER to COOLER REGIONS
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T1.How is the process of CONVECTION CURRENT happen regarding radiator?
The less denser, warmer air rises and is replaced by the cooler, denser air (and is then heated by the radiator)
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T1.What are the ways of reducing UNWANTED ENERGY TRANSFERS?
LUBRICANTS(-liquids that flow easily between and coat-reduce FRICTIONAL FORCES) & INSULATION(-PREVENTS energy loss through heating
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T1.What does EFFICIENCY mean?
The LESS ENERGY that is 'WASTED' in energy store, MORE EFFICIENT
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T1.What are the 2 equations relating the calculation of Efficiency?
USEFUL OUTPUT ENERGY TRANSFER÷TOTAL INPUT ENERGY TRANSFER & USEFUL POWER INPUT÷TOTAL POWER INPUT
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T1.What are the 2 groups of Energy Resources?
Renewable & Non- renewable
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T1.What does the term 'non-renewable' suggest?
These resources will RUN OUT one day
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T1.What are the 3 examples of non-renewable fossil fuels?
Coal, Crude Oil, Natural Gas
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T1.What are Energy Resources USED FOR?
Mainly TRANSPORT & HEATING
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T1.What are the 3 aspects of non-renewable resources?
They will run out, they all do DAMAGE to the ENVIRONMENT, provide MOST of our ENERGY
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T1.What does the term 'renewable' refer to?
will NEVER RUN OUT
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T1.Provide examples of Renewable Energy Resources?
Solar(Sun), Wind, Water waves, Hydro-electricity, Bio-fuel, Tides, Geothermal
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T1.What are the aspects regarding renewable resources?
never run out & can be renewed, mostly do damage but less nasty ways, but do not provide much electricity & mostly UNRELIABLE; rely on weather
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T1.What are the pros and cons of renewable resources?
+ No pollution, no permanent damage to landscape, no fuel costs. - Very noisy, unappealing view, unreliable
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T1.What are the pros and cons of non-renewable resources?
+ Reliable, provide more energy - Waste products released, encourages the green house effect, fuels slowly running out
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T2. What is the definition of Current(ampere,A)?
Flow of electrical charge
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T2. What is the definition of Potential Difference/voltage(volt,V)
The driving force that pushes the charge around.
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T2. What is the definition of resistance(Ohms, Ω)?
Anything that slows the flow down
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T2. What happens when the resistance across a component is greater?
the current flows smaller
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T2. How do you calculate the Charge flow(Coulombs,C)?
Current(A) × Time(s)
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T2. What is the equation calculating Potential Difference(V)?
Current(A) × Resistance(Ω)
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T2. What does the Ammeter measure?
Current (in amps) and must always be placed in SERIES with whatever you are investigating.
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T2. What does the Voltmeter measure?
Potential Difference (in volts) and must always be placed in PARALLEL around whatever you're investigating.
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T2. What is an Ohmic Conductor?
A conductor that obeys OHM'S LAW: V= I × R
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T2. What do Ohmic Conductors have?
Constant Resistance
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T2. How does Current behave through an Ohmic Conductor?
DIRECTLY PROPORTIONAL to Potential Difference - straight line on graph
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T2. How does Current behave through a Filament Lamp?
As Current increases, the TEMPERATURE of filament INCREASES, so RESISTANCE INCREASES - LESS CURRENT can FLOW - curve graph
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T2. How does Current behave through a Diode?
Only FLOW in ONE DIRECTION. Has VERY HIGH RESISTANCE in REVERSE DIRECTION
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T2. What does LDR stand for?
Light Dependent Resistor
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T2. What is an LDR?
Resistor that is dependant on the INTENSITY of LIGHT. In BRIGHT LIGHT - resistance FALLS, in darkness - resistance HIGHEST
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In SERIES CIRCUITS, how is the total PD supplied to each component?
SHARED
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T1.How is energy transferred?

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Mechanically(by a force doing work), electrically(work done by moving charges), by heating or by radiation.

Card 3

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T1.How do you calculate Kinetic energy(J)?

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Card 4

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T1.How do you calculate Gravitational Potential energy(J)?

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Card 5

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T1.How do you calculate Elastic Potential Energy(J)?

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