1.2 Energy stores and systems
9 exam questions worth 17 marks. Write your answer, open the mark scheme, then give yourself the marks you earned. Your answers are saved on this device.
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A stretched spring has energy in which store?
Choose one answer.
Correct Not quite: the answer is Elastic potential
Mark scheme
B: elastic potential
Model answer
Elastic potential (B).
Name the energy store that increases as a ball is thrown upwards.
Mark scheme
gravitational potential (store)
Model answer
The gravitational potential store.
State the unit of energy.
Mark scheme
joule / J
Model answer
The joule (J).
An electric kettle heats water. Describe the energy transfers that happen in the kettle.
Mark scheme
energy transferred electrically (1) to the heating element (1) then by heating to the thermal store of the water (1)
Model answer
Energy is transferred electrically to the heating element, then by heating to the thermal store of the water.
Name the four ways in which energy can be transferred.
Mark scheme
mechanically / by a force (1); electrically (1); by heating (1); by radiation (1); any two for 1 mark each, maximum 2 marks
Model answer
Mechanically, electrically, by heating and by radiation.
A car brakes and slows down. Describe how the energy stores change.
Mark scheme
kinetic store of the car decreases (1); thermal store of the brakes increases (1); friction / mechanical transfer then heating, and energy also dissipates to the surroundings (1)
Model answer
The kinetic store of the car decreases. Friction in the brakes transfers energy mechanically to the thermal store of the brakes, which increases, and then to the surroundings by heating.
Which of these is NOT a way of transferring energy?
Choose one answer.
Correct Not quite: the answer is By insulation
Mark scheme
D: By insulation
Model answer
By insulation (D). Insulation reduces energy transfer; it is not a way of transferring energy.
A diver climbs a ladder to the top of a diving board and then dives into the pool. Describe the energy transfers that take place.
Mark scheme
climbing: chemical store of the diver decreases and gravitational potential store increases (mechanical transfer) (1); falling: gravitational potential store decreases and kinetic store increases (1); entering the water: kinetic store decreases and the thermal store of the water / surroundings increases (1)
Model answer
When climbing, energy is transferred from the chemical store of the diver to the gravitational potential store. During the dive, it is transferred to the kinetic store. In the water, the kinetic energy is transferred to the thermal store of the water and the surroundings.
A cup of tea at 80 °C and a bath of water at 40 °C are compared. Explain which has more energy in its thermal store.
Mark scheme
the bath (1); it contains many more particles / a much larger mass of water, so more energy in total although at a lower temperature (1)
Model answer
The bath has more energy in its thermal store, because it contains a far larger mass of water, so the total energy of all the particles is greater, even though the temperature is lower.
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