Name the eight energy stores.

Kinetic, gravitational potential, elastic, chemical, thermal, nuclear, electrostatic and magnetic.

What is a kinetic store?

The energy an object has because it is moving.

What is a gravitational potential store?

The energy an object has because of its height above the ground.

What is an elastic store?

Energy in a stretched or squashed spring or elastic band.

Name the four ways energy can be transferred.

Mechanical work, electrical work, heating and radiation (waves).

What is mechanical work?

Energy transferred when a force moves an object.

What is electrical work?

Energy transferred by an electric current in a circuit.

What does heating transfer energy from and to?

From a hotter object to a cooler one.

Give an energy chain for a freewheeling bicycle.

Gravitational potential store, then kinetic store, then thermal store of the surroundings.

What does a Sankey diagram show?

How energy flows through a device, with arrow widths drawn to scale.

Energy stores and transfersIB MYP Physics: Flashcards

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What is the unit of energy?

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What is the unit of energy?: The joule (J).
Name the eight energy stores.: Kinetic, gravitational potential, elastic, chemical, thermal, nuclear, electrostatic and magnetic.
What is a kinetic store?: The energy an object has because it is moving.
What is a gravitational potential store?: The energy an object has because of its height above the ground.
Where is energy stored in a battery?: In the chemical store.
What is an elastic store?: Energy in a stretched or squashed spring or elastic band.
Name the four ways energy can be transferred.: Mechanical work, electrical work, heating and radiation (waves).
What is mechanical work?: Energy transferred when a force moves an object.
What is electrical work?: Energy transferred by an electric current in a circuit.
What does heating transfer energy from and to?: From a hotter object to a cooler one.
Give an energy chain for a freewheeling bicycle.: Gravitational potential store, then kinetic store, then thermal store of the surroundings.
What does a Sankey diagram show?: How energy flows through a device, with arrow widths drawn to scale.
What does the width of a Sankey arrow represent?: The amount of energy.

Exam questions on Energy stores and transfers

A student in Mumbai rides a bicycle to the top of a hill, then freewheels down it without pedalling before braking to a stop at the bottom.
Describe the energy changes as the student freewheels down the hill.2 marks
A hand torch contains a battery that lights a small lamp. After a few minutes the casing of the lamp feels warm.
Write an energy chain for the torch, naming the stores and the transfers.2 marks
A student drops a tennis ball from heights of 0.50, 1.00, 1.50 and 2.00 m onto a hard floor and measures the height of the first bounce each time. The bounce heights are 0.32, 0.64, 0.95 and 1.30 m.
Describe the trend in the results and calculate the bounce height as a percentage of the drop height for the 1.00 m drop.3 marks

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Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).