Light
What is the main source of light on our planet earth?
The sun.
What is the main source of heat on our planet?
The sun.
Friction is when you rub two things together to produce WHAT?
Heat.
What will happen to a plant that has sunlight?
It will grow nice and green!
Do winter clothes give off their own heat?
NO!!!!
If the two surfaces are smooth, is it easier or harder to rub them together?
Easier.
What will happen to a plant without sunlight?
It will starve/die.
Name something that produces heat.
Many answers.
If the two surfaces are rough, will rubbing them together produce more or less heat?
More heat.
What is the difference between dark colors and light colors in the sunlight?
Dark colors absorb light. Light colors reflect light.
Name something that keeps you warm but DOES NOT give off its own heat.
CLothes, blankets
Name two things you can rub together to produce heat.
Lots of different answers!
Name a machine that produces light.
Many answers
Name a machine that produces heat.
Many answers
Demonstrate what friction looks like.
Rubbing two things together!