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Everyday Machines / Week 08 / Friday
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Week 08 · The Refrigerator

Friday

Explain the refrigerator
// A machine that moves heat out
⏱ about 15 min

Friday: Explain the Refrigerator

Rocket taps his notebook. "Time to explain the fridge!"

Raven holds up the cutaway drawing. "Start with the heat."

Nova dims her glow. "I will listen. You do the telling."

"Heat moves from warm to cool," Rocket begins.

What we learned

  • Heat moves from warmer things to cooler things.
  • Kitchen heat leaks into the fridge.
  • The fridge moves that heat out the back.
  • Thick walls and a tight seal keep heat out.
On paper, draw a fridge cutaway. Show heat going out the back.
HOW A FRIDGE STAYS COLD
  • Tap a card.
  • Then tap its spot.
1First
2Next
3Then
4Last
EXPLAIN IT
  • Read the question.
  • Tap your answer.
Which way does heat move?
Why is the back of a fridge warm?
Why keep the door open only a moment?

Tell a grown-up

Try it
Find a grown-up.
Show your cutaway drawing.
Explain where the heat goes.
Use the words heat, insulation and seal.
SentenceTrue or false?
A fridge makes cold and sends it out the back.?
A fridge moves heat from inside to the room.?
Insulation keeps heat from passing through.?
An open door lets warm air in.?
WHY THIS EXERCISESaying it in your own words shows you understand it.
For a grown-up
Ask: where does the heat go?
Ask: why does the door need a seal?
Tomorrow is Machine Day: a cold and warm hunt.
OUR FRIDGE WEEK
  • Read the question.
  • Tap your answer.
What did Rocket hold on Tuesday?
What did we test the seal with?
Which reading was lower?
SentenceTrue or false?
Heat stops moving when two things match in warmth.?
The back of a fridge is safe to touch.?
Fridge air should be 40 degrees or colder.?
WHY THIS EXERCISELooking back helps the ideas stick.

You explained a fridge in your own words. Wonderful!

Next week, we meet the thermostat.

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