Energy (Changes in energy (elastic potential energy stored in a stretched…
Students should be able to give examples that illustrate the definition of
power eg comparing two electric motors that both lift the same weight
through the same height but one does it faster than the other.
Students should be able to describe all the changes involved in the way
energy is stored when a system changes, for common situations. For
•• 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.
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.