PHYSICS AQA TEST PAPER QUESTIONS
AND SOLUTIONS VERIFIED ANSWERS
●● How is energy transferred?
Answer: 1) Mechanically - force doing work
2) Electrically - work done by moving charges
3) Heating/Radiation - light, sound
●● How can work be done?
Answer: When a current flows or by a force moving an object
●● Kinetic energy formula
Answer: E=1/2mv²
Kinetic energy(J) = 0.5 x mass(kg) x speed²(m/s)
●● Gravitational potential energy formula
Answer: E=mgh
G.P.E(J) = mass(kg) x gravitational field strength (N/kg) x height (m)
●● What happens when an object falls and there's no air resistance?
Answer: Energy lost from the g.p.e store = energy gained in the kinetic
energy store
,●● What does air resistance do when acting against falling objects?
Answer: It causes some energy to be transferred to other energy stores
e.g. the thermal energy stores of the object and the surroundings
●● Elastic potential energy formula
Answer: E=1/2ke²
E.P.E(J) = 0.5 x spring constant(N/m) x extension²(m)
●● What is SHC?
Answer: The amount of energy needed to raise the temperature of 1kg of
a substance by 1°C
●● SHC formula
Answer: E=mcθ
Change in thermal energy(J) = mass(kg) x SHC(J/kg/°C) x temperature
change(°C)
●● What is the conservation of energy principle?
Answer: Energy can be transferred usefully, or stored or dissipated
(wasted energy), but can never be created or destroyed
●● What is power?
,Answer: The rate of energy transfer, or the rate of doing work
●● What is 1W equal to?
Answer: 1J of energy transferred per second
●● Power Equation 1
Answer: E=Pt
Energy transferred(J) = power(W) x time(s)
●● Power Equation 2
Answer: W=Pt
Work done(J) = power(W) x time(s)
●● What is conduction?
Answer: The process where vibrating particles transfer energy to
neighbouring particles
Energy is transferred to thermal stores of the object - this energy is
shared across the kinetic energy stores
●● What is thermal conductivity?
Answer: A measure of how quickly energy is transferred through a
material via conduction
, ●● What is convection?
Answer: Where energetic particles move away from hotter to cooler
regions
Energy is transferred to the thermal energy stores of the object and is
shared across the kinetic stores
●● What do radiators create?
Answer: Convection currents
●● Convection currents - process
Answer: 1) Energy is transferred from the radiator to the nearby air
particles by conduction
2) The air by the radiator becomes warmer and less dense as the particles
move quicker
3) The warm air rises and displaces the cooler air, which is then heated
by the radiator
4) The previously heated air transfers energy to the surroundings - the air
cools, becomes denser and sinks
●● What does lubrication do?
Answer: Reduce frictional forces
●● What does insulation do?
Answer: Reduce the rate of energy transfer by heating
AND SOLUTIONS VERIFIED ANSWERS
●● How is energy transferred?
Answer: 1) Mechanically - force doing work
2) Electrically - work done by moving charges
3) Heating/Radiation - light, sound
●● How can work be done?
Answer: When a current flows or by a force moving an object
●● Kinetic energy formula
Answer: E=1/2mv²
Kinetic energy(J) = 0.5 x mass(kg) x speed²(m/s)
●● Gravitational potential energy formula
Answer: E=mgh
G.P.E(J) = mass(kg) x gravitational field strength (N/kg) x height (m)
●● What happens when an object falls and there's no air resistance?
Answer: Energy lost from the g.p.e store = energy gained in the kinetic
energy store
,●● What does air resistance do when acting against falling objects?
Answer: It causes some energy to be transferred to other energy stores
e.g. the thermal energy stores of the object and the surroundings
●● Elastic potential energy formula
Answer: E=1/2ke²
E.P.E(J) = 0.5 x spring constant(N/m) x extension²(m)
●● What is SHC?
Answer: The amount of energy needed to raise the temperature of 1kg of
a substance by 1°C
●● SHC formula
Answer: E=mcθ
Change in thermal energy(J) = mass(kg) x SHC(J/kg/°C) x temperature
change(°C)
●● What is the conservation of energy principle?
Answer: Energy can be transferred usefully, or stored or dissipated
(wasted energy), but can never be created or destroyed
●● What is power?
,Answer: The rate of energy transfer, or the rate of doing work
●● What is 1W equal to?
Answer: 1J of energy transferred per second
●● Power Equation 1
Answer: E=Pt
Energy transferred(J) = power(W) x time(s)
●● Power Equation 2
Answer: W=Pt
Work done(J) = power(W) x time(s)
●● What is conduction?
Answer: The process where vibrating particles transfer energy to
neighbouring particles
Energy is transferred to thermal stores of the object - this energy is
shared across the kinetic energy stores
●● What is thermal conductivity?
Answer: A measure of how quickly energy is transferred through a
material via conduction
, ●● What is convection?
Answer: Where energetic particles move away from hotter to cooler
regions
Energy is transferred to the thermal energy stores of the object and is
shared across the kinetic stores
●● What do radiators create?
Answer: Convection currents
●● Convection currents - process
Answer: 1) Energy is transferred from the radiator to the nearby air
particles by conduction
2) The air by the radiator becomes warmer and less dense as the particles
move quicker
3) The warm air rises and displaces the cooler air, which is then heated
by the radiator
4) The previously heated air transfers energy to the surroundings - the air
cools, becomes denser and sinks
●● What does lubrication do?
Answer: Reduce frictional forces
●● What does insulation do?
Answer: Reduce the rate of energy transfer by heating
