AQA GCSE PHYSICS PAPER 1 & PAPER
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AQA GCSE PHYSICS PAPER 1
What happens when some insulating materials become electrically charged by rubbing? - ANSWER-Negatively charged electrons are rubbed off one material and on to the other. The material that gains electrons becomes negatively charged. The material that loses electrons is left with an equal positive charge
What is the equation that links power, potential difference and current? - ANSWER-Power = potential difference x current [P=IV]
What is the equation that links power, current and resistance? - ANSWER- Power = (current)2 x resistance [P=I2R]
What is the unit for power? - ANSWER-Watts (W)
What does the amount of energy an appliance transfers depend upon? - ANSWER-How long the appliance is switched on for and the power of the appliance
If he was the equation that links energy transferred, power and time? - ANSWER-Energy transferred = power x time [E=Pt]
What is the equation that links energy transferred, charge flow and potential difference? - ANSWER-Energy transferred = charge flow x potential difference
[E=QV]
What is the National Grid? - ANSWER-A system of cables and transformers linking power stations to consumers
Why are step-up transformers used? - ANSWER-To increase the potential difference from the power station to the transmission cables
What is a system in terms of energy? - ANSWER-An object or group of objects
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Name the seven energy stores - ANSWER-Kinetic, (internal) Thermal, Chemical, Gravitational Potential, Elastic Potential, Electrostatic and Magnetic [MICKEE G - to remember them]
What is a closed system? - ANSWER-Systems were neither matter nor energy can enter or leave. The net change in the total energy of a closed system is always zero.
What does 'doing work' result in? - ANSWER-A transfer of energy
What is the unit of energy? - ANSWER-Joule
List the four ways energy can be transferred between stores? - ANSWER-By mechanical work, by electrical work, by heating, by radiation
What is the conservation of energy principle? - ANSWER-Energy can be transferred usefully, stored or dissipated, but can never be created or destroyed
What is energy dissipation? - ANSWER-When energy is not transferred usefully but is wasted (often as thermal energy)
What is the equation linking kinetic energy, mass and velocity - ANSWER-0.5 x mass x (velocity squared)
What are the units for velocity? - ANSWER-Meters per second (m/s)
What are the units for mass? - ANSWER-Kilograms (kg)
What is the equation linking elastic potential energy, the spring constant and extension? - ANSWER-0.5 x spring constant x (extension squared)
What are the units for the spring constant? - ANSWER-Newtons per metre (N/m)
What are the units for extension? - ANSWER-Metres (m)
What is the equation linking gravitational potential energy, mass, gravity and height? - ANSWER-Mass x gravitational field strength x height [Ep=mgh]
What are the units for gravitational field strength? - ANSWER-Newtons per kg (N/kg)
What are the units for height? - ANSWER-Meters (m) 2 / 4
What is conduction? - ANSWER-The process by which vibrating particles transfer energy to neighbouring particles
What is thermal conductivity? - ANSWER-Are measure of how quickly energy is transferred through a material by conduction
What is convection? - ANSWER-Were energetic particles move away from a hotter to cooler regions
What does the symbol ∆ mean? - ANSWER-Change
What is specific heat capacity of a substance? - ANSWER-The amount of energy required to raise the temperature of 1 kg of the substance by 1° Celsius
What are the units for specific heat capacity? - ANSWER-Joules per kilogram per ° C (Jk/kg/°C)
What is power? - ANSWER-The rate at which energy is transferred or the rate at which work is done if
What is the unit of power? - ANSWER-Watts (W)
What is the equation linking power, energy and time? - ANSWER-Power = energy transferred/time [P=E/t]
What is the equation linking power, work done and time? - ANSWER-Power = work done/time [P=W/t]
What are the units for work done? - ANSWER-Joules (J)
What happens to waste energy? - ANSWER-It is dissipated
How can we reduce unwanted energy transfers? - ANSWER-Through lubrication, by installation
Give four examples of insulation that can be used in the house? - ANSWER- Cavity walls, loft insulation, double glazing, draught proofing
What is the equation for working out efficiency using energy? - ANSWER- Efficiency = useful output energy transfer/ total input energy transfer
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What is the equation for working out efficiency using power? - ANSWER- Efficiency = useful power output / total power input
What are the units for efficiency? - ANSWER-There are none
List the 11 energy resources on Earth - ANSWER-Coal, gas, oil, nuclear fuel, biofuel, wind, hydroelectricity, geothermal, the tides, the sun and water waves
Name the fossil fuels - ANSWER-Coal, gas, oil
What is a renewable energy source? - ANSWER-One that is being (or can be) replenished as it is used
List three uses of Energy Resources - ANSWER-Transport, electricity generation and heating
What is density? - ANSWER-The amount of mass per unit volume
What is the equation for density? - ANSWER-Density = Mass/Volume [ρ=m/V]
What are the two units for density? - ANSWER-Kg/m3 and g/cm3
How do you convert from Kg/m3 to g/cm3? - ANSWER-Divide by 1000
How do you convert from g/cm3 to Kg/m3? - ANSWER-Multiply by 1000
What two things can the particle model be used to explain? - ANSWER-The different states of matter and density
What is melting? - ANSWER-When a solid turns into a liquid when heated
What is freezing? - ANSWER-When a liquid turns into a solid when cooled
What is boiling? - ANSWER-When a liquid turns into a gas when heated
What is condensing? - ANSWER-When a gas turns into a liquid when cooled
What is evaporation? - ANSWER-When a liquid is vaporised and turns into a gas by
What is sublimation? - ANSWER-When a solid turns straight into a gas without becoming a liquid first (or when a gas turns straight into a solid without becoming a liquid first)
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