Energy stores and systems
18.104.22.168 Energy stores and systems
SlowMO Bouncy Ball
3 Beakers of coloured water (to demonstrate energy pathways and stores)
Round robin with various energy transfers such as water drinking bird, Bunsen, Elastic toy, Light bulb battery, Students to take notes for each energy in energy out scenrio.
Various energy systems where students can decide which energy stores the energy is converted from to
P1.1 - Changes in stores
P1.2 - Conservation of energy
A system is an object or group of objects.
There are changes in the way energy is stored when a system changes.
Students should be able to describe all the changes involved in the way energy is stored when a system changes, for common situations. For example:
- an object projected upwards
- a moving object hitting an obstacle
- an object accelerated by a constant force
- a vehicle slowing down
- bringing water to a boil in an electric kettle.
The link between work done (energy transfer) and current flow in a circuit is covered inEnergy transfers.
Throughout this section on Energy students should be able to calculate the changes in energy involved when a system is changed by:
- work done by forces
- work done when a current flows
- use calculations to show on a common scale how the overall energy in a system is redistributed when the system is changed.
WS 1.2 - Use a variety of models to solve problems mathematically
WS 4.3 - Use SI units (eg kg, g, mg; km, m, mm; kJ, J) and IUPAC chemical nomenclature unless inappropriate.
WS 4.5 - Interconvert units.
WS 4.6 - Use an appropriate number of significant figures in calculation.
MS 1a - Recognise and use expressions in decimal form
MS 1c - Use ratios, fractions and percentages
MS 3b Change the subject of an equation
MS 3c Substitute numerical values into algebraic equations using appropriate units for physical quantities