IB Physics SL A.3.1 Conservation of energy

Practise tracing energy stores and transfers, then using conservation of energy to explain outcomes and calculate speeds or power.

Exam points

explain where 'missing' energy goes, such as zero intensity points transferring energy into diffraction maxima
apply energy conservation to motion by equating mgh and 1/2 mv^2 to show impact speed without air resistance
describe staged transfers in devices, for example wind kinetic energy to turbine rotation to electrical output

[Maximum number: 2]

This question is in two parts. Part 1 is about energy resources. Part 2 is about thermal physics.
Part 1 Energy resources
Electricity can be generated using nuclear fission, by burning fossil fuels or using pump storage hydroelectric schemes.

A mass of 0.22 kg of lead spheres is placed in a well-insulated tube. The tube is turned upside down several times so that the spheres fall through an average height of 0.45 m each time the tube is turned. The temperature of the spheres is found to increase by $8^{\circ} \mathrm{C}$ .

Figure for Question A.3.1—Conservation of energy question 1 — IB Physics SL

Discuss the changes to the energy of the lead spheres.

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A.3.1—Conservation of energy question 1