AQA GCSE Combined Science Physics -
Paper 1 Questions and Correct Answers/
Latest Update / Already Graded
Energy is transferred between stores
Ans: Thermal, kinetic, gravitational potential, elastic potential,
chemical, magnetic, electrostatic, nuclear
Energy is transferred...
Ans: 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
Ans: 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
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Ans: 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
Ans: 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
Ans: 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
Ans: As long as the limit of proportionality has not been
exceeded, Ee (j) = 1/2 k (N/m) e (m) squared
specific heat capacity
Ans: 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)
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Conservation of energy principle
Ans: Energy can be transferred but can never be created of
destroyed
Dissipated energy
Ans: energy used up in a system, typically lost due to work
done by friction, 'wasted energy'
Phone energy
Ans: 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
Ans: 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
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Ans: The rate at which work is done (watts). P(w) = E(j) / t(s)
Powerful machine
Ans: One which transfers a lot of energy in a short space of
time
Conduction occurs mainly in solids
Ans: Conduction is the process where vibrating particles
transfer energy to neighbouring particles.
Long definition of conduction
Ans: 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
Ans: the Mrs sure of the rate at which thermal energy can
travel through a material
Convection occurs only in liquids and gases
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