2023 AQA
A-level
PHYSICS
7408/1
Paper 1
Energy is transferred between stores
ANSWERThermal, kinetic, gravitational
potential, elastic potential, chemical, magnetic,
electrostatic, nuclear
Energy is transferred...
ANSWERMechanically (by a force doing
work), electrically (work done by movi...
,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)
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