AQA GCSE Physics - Paper 1 Exam Questions and Verified Answers

AQA GCSE Physics - Paper 1 Exam

Questions and Verified Answers


Energy Stores - ✔✔1) Elastic potential

2) Gravitational potential

3) Thermal

4) Electrostatic

5) Nuclear

6) Chemical

7) Kinetic

8) Magnetic

9) Light

10) Sound

How is energy transferred? - ✔✔1) Mechanically - force doing work

2) Electrically - work done by moving charges

3) Heating/Radiation - light, sound

How can work be done? - ✔✔When a current flows or by a force moving an

object

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,Kinetic energy formula - ✔✔E=1/2mv²

Kinetic energy(J) = 0.5 x mass(kg) x speed²(m/s)

Gravitational potential energy formula - ✔✔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? -

✔✔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? - ✔✔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 - ✔✔E=1/2ke²

E.P.E(J) = 0.5 x spring constant(N/m) x extension²(m)

What is SHC? - ✔✔The amount of energy needed to raise the temperature

of 1kg of a substance by 1°C

SHC formula - ✔✔E=mcθ

Change in thermal energy(J) = mass(kg) x SHC(J/kg/°C) x temperature

change(°C)




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,What is the conservation of energy principle? - ✔✔Energy can be

transferred usefully, or stored or dissipated (wasted energy), but can never

be created or destroyed

What is power? - ✔✔The rate of energy transfer, or the rate of doing work

What is 1W equal to? - ✔✔1J of energy transferred per second

Power Equation 1 - ✔✔E=Pt

Energy transferred(J) = power(W) x time(s)

Power Equation 2 - ✔✔W=Pt

Work done(J) = power(W) x time(s)

What is conduction? - ✔✔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? - ✔✔A measure of how quickly energy is

transferred through a material via conduction

What is convection? - ✔✔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
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, What do radiators create? - ✔✔Convection currents

Convection currents - process - ✔✔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? - ✔✔Reduce frictional forces

What does insulation do? - ✔✔Reduce the rate of energy transfer by

heating

Thermal insulation techniques - ✔✔1) Cavity walls - made up of an inner

and outer wall with an air gap in the middle - the air gap reduces the

amount of energy transferred by conduction through the walls

2) Cavity wall insulators - the air gap is filled with foam also reduces energy

transfer by convection in the wall cavity

3) Loft insulation - reduces convection currents being created in lofts



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