Energy can be transferred into or out of a system in different ways.
A cell is connected to an electric bell. When the circuit is completed, charge passes through the bell.
State the pathway by which energy is transferred from the cell to the bell.
Bread rolls are removed from an oven. The bread rolls are at a higher temperature than the air in the kitchen.
State the pathway by which energy is transferred from the bread rolls to the air.
A book is pushed so that it slides across a rough carpet. It slows down and comes to rest.
State the energy store of the book that decreases as it slides.
Explain why the book and the carpet become slightly warmer as the book slides.
A parcel moves horizontally along a conveyor belt. The weight of the parcel acts vertically downwards.
Give the work done by the weight of the parcel as it moves horizontally.