Name
Date
DIRECTIONS: Heat always moves from the hotter thing to the colder one. Draw an arrow for each, and say what happens.
A coat does not make heat: it slows heat leaking out of you. A
fridge does not make cold: it moves heat out of the food.
Which way does the heat go?
| Situation | Heat moves from… | …to | What happens |
|---|
| 1. A hot drink left on the table | | | |
| 2. An ice cube in your hand | | | |
| 3. A radiator in a cold room | | | |
| 4. A cold drink on a warm day | | | |
Conductors let heat through quickly — most metals.
Insulators slow it down — air, wool, plastic, wood, foam.
| Object | Conductor or insulator? | How do you know? |
|---|
| 5. a metal saucepan | | |
| 6. a woolly hat | | |
| 7. a wooden spoon | | |
| 8. a foam cup | | |
| 9. a copper wire | | |
| 10. the air in a double-glazed window | | |
- Saucepans are metal but their handles are usually plastic or wood. Explain both choices.
- A vacuum flask keeps hot drinks hot and cold drinks cold. How can one thing do both?
DIRECTIONS: Fill a metal, a china and a foam cup with the same warm water. Feel each after 5 and 15 minutes.
| Cup | Prediction: fastest or slowest to cool? | After 5 min | After 15 min |
|---|
| metal | | | |
| china | | | |
| foam | | | |
- Which cup kept the water warm longest? Was your prediction right?
- Which cup was the best conductor? How does the result show it?
- Somebody says the foam cup "kept the cold out". Rewrite that sentence so it is correct.