1
What provides the Earth with heat?
Sun
Different materials transfer heat at different rates. True or False.
True
Can our skin accurately sense how hot or cold something is?
What is our normal body temperature?
about 37 degrees celcius
Heat is transferred from the ___________ to _________.
hotter part ; colder part
He may feel warm by rubbing hands.
Which transfers heat faster, metal chopsticks or ceramic spoons?
metal chopsticks
metal
Candles produce heat by ___________
burning
plastic
expands ; contracts
When something is heated, its temperature __________.
rises/ increases
Liquid, air and metals can all expand. True or False
True
When something is cooled, its temperature _______.
drops/ decreases
List one use of heat in daily life
cooking, killing germs, sterilize items, keep ourselves warm, drying things, etc
List two poor conductors of heat.
plastic, paper, glass, etc
What are the three ways to produce heat?
Rubbing, from electricity, burning
List three good conductors of heat.
iron, metal, silver, copper, aluminium, etc
What happens when we heat an iron rod?
It expands.
Metals _________ when heated and __________ when cooled.
expands; contracts
How can you deliver hot food from the ovens safely?
wear gloves; put the plate on the plastic plate and hold the plastic plate.
iron, cooker, oven, etc.
Iron and coppers transfer heat more quickly/slowly. They are ____________ conductors of heat.
quickly; good
Name three kinds of thermometer.
The railways contracted when cooled and expanded when heated. It's because of _______________
heat expansion and contraction. / thermal expansion and contraction.