Can we make heat by friction?
Yes! We can create heat by rubbing two things together. This is called friction.
Try this: All you need to make the experiments is: nail, hammer, piece of wood.
Caution: Be careful when you youse the hammer and the nail. Do it only when your parents are near around you.
Step 1: Feel (the temperature of) a nail and hammer.
Step 2: Hammer the nail into a piece of wood. Feel (the temperature of) both nail and hammer again.
All you need to make the experiments is: nail, hammer, piece of wood.
Caution: Be careful when you youse the hammer and the nail. Do it only when your parents are near around you.
Step 1: Feel (the temperature of) a nail and hammer.
Step 2: Hammer the nail into a piece of wood. Feel (the temperature of) both nail and hammer again.
Can you see the difference?
What you will see: Both nail and hammer are warm.
Why: The energy of your muscle is given to the moving hammer, and goes from the hammer to the nail. Because of the added energy, the molecules of the hammer and nail move faster and the heat is increased.
Friction experiment 2
Step 1: Put your hands on your cheeks to see how warm your hands are.
Step 2: Rub your hands together quickly 10 times. Bring them to your cheeks.
Can you see the difference?
What you will see: After rubbing, your hands are warmer than before.
Why: Friction (rubbing) causes movement of molecules. So the temperature of your hands was raised.