Physics paper 1(AQA) Final Review Exam Questions And Already Passed Answers.
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Course
GCSE Physics
Institution
GCSE Physics
Energy is transferred between stores - Answer Thermal, kinetic, gravitational potential, elastic potential, chemical, magnetic, electrostatic, nuclear
Energy is transferred... - Answer Mechanically (by a force doing work), electrically (work done by moving charges), by heating or by radiat...
Physics paper 1(AQA) Final Review
Exam Questions And Already Passed
Answers.
Energy is transferred between stores - Answer Thermal, kinetic, gravitational potential, elastic
potential, chemical, magnetic, electrostatic, nuclear
Energy is transferred... - Answer Mechanically (by a force doing work), electrically (work done by
moving charges), by heating or by radiation (like light or sound)
When a system changes, energy is transferred - Answer It can be transferred into or away from the
system, between objects in the system or between different types of energy stores. Closed systems are
where neither matter nor energy can enter or leave. The net change in the total energy of a closed
system is always 0
kinetic energy - Answer energy of motion - the greater an object's mass and the faster it is going, the
more energy there will be in its kinetic energy store. Ek (j) = 1/2m(kg)v(m/s) squared
Raised objects store energy in gravitational potential energy stores - Answer lifting an object in a
gravitational field requires work, causing an energy transfer to the the GPE store of the object. Ep(j) =
m(kg)g(n/kg)h(m)
Falling objects transfer energy - Answer Falling objects transfer energy from its GPE store to its kinetic
energy store. When there's no air resistance, energy lost from the GPE store = energy gained in the
kinetic energy store
Stretching transfers energy to elastic potential energy stores - Answer As long as the limit of
proportionality has not been exceeded, Ee (j) = 1/2 k (N/m) e (m) squared
specific heat capacity - Answer the energy required to raise the temperature of one gram of a
substance by one degree Celsius. 🔼E (j) = m(kg) c(j/kgdegree) 🔼theta (degrees Celsius)
,Conservation of energy principle - Answer Energy can be transferred but can never be created of
destroyed
Dissipated energy - Answer energy used up in a system, typically lost due to work done by friction,
'wasted energy'
Phone energy - Answer When you use the phone, energy is usefully transferred from the chemical
energy store of the battery in the phone, but some of this energy is dissipated to thermal energy
Closed system energy transfer - Answer A cold spoon is dropped into hot soup in an insulated flask,
which is then sealed. Energy is transferred from the thermal energy store of the soup to the useless
thermal energy of the spoon
Power - Answer The rate at which work is done (watts). P(w) = E(j) / t(s)
Powerful machine - Answer One which transfers a lot of energy in a short space of time
Conduction occurs mainly in solids - Answer Conduction is the process where vibrating particles
transfer energy to neighbouring particles.
Long definition of conduction - Answer Energy transferred to an object by heating is transferred to the
thermal store, which is shared across the kinetic store of the particles. The particles' collisions cause
energy to be transferred between particles kinetic energy stores.
thermal conductivity - Answer the Mrs sure of the rate at which thermal energy can travel through a
material
Convection occurs only in liquids and gases - Answer Convection is where energetic particles move
away from hotter to cooler regions
Convection longer definition - Answer Unlike in solids, the particles in liquids and gases are able to
move. When you heat a region of a gas/liquid, the particles move faster and the space between particles
increases. This causes the density of the region to decrease. Because they can flow, the warmer and less
, dense region will rise above denser cooler regions. If there is a constant heat source, a convection
current will be made
Radiators - convection currents - Answer Energy is transferred from the radiator to nearby air particles
by conduction. The air by the radiator becomes warmer and less dense. This warm air rises and is
replaced by cooler air. At the same time, the previously heated air transfers energy to the surrounding
and cools, becomes denser, and sinks. This cycle repeats and causes a flow of air to circulate around the
room
How to reduce unwanted energy transfers - Answer Lubrication and thermal insulation
Lubrication reduces frictional forces - Answer When something moves, there's at least one frictional
force acting on it, causing some energy to be dissipated. For objects that are rubbed together, lubricants
reduce the fiction between the object's surfaces when moved. Lubricants tend to be liquids (like oil) to
flow easily between objects and coat them
Insulation reduces the rate of energy transfer by heating - Answer Things to do to prevent energy loss
through heating...
- have think walls made from low thermal conductivity material. This makes the rate of energy transfer
slower, so the building will cool more slowly.
- use thermal insulation
Thermal insulation examples - Answer - cavity walls made of an inner and outer wall with an air gap in
between to reduce the amount of energy transferred by conduction.
- loft insulation can reduce convection currents created in lofts
- double glazed windows have an air gap between two layers of glass to prevent energy transfer by
conduction
- draught excluders around doors and windows reduce energy transfers by convection
Most energy transfers involve some waste energy - Answer Efficiency = useful output energy transfer /
total input energy transfer OR efficiency = useful power output / total power input
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