Heat transfer
Answers are for parents and teachers.
1
Of metal, wooden and plastic spoons, which heats fastest in tea and why?
Metal, because it conducts heat well.
2
Find two examples of convection at home.
Sample: air movement above a heater; water mixing in a kettle (with an adult).
3
Why do gloves keep hands warm in winter? Recall the layer of air.
Air trapped in the fabric conducts heat poorly.
4
Leave white and black paper in sunlight and compare with your hand which warms more.
The black paper warms more.
5
Draw the structure of a thermos and label its parts.
Two walls, vacuum, shiny surface, stopper.