1. Put your cold hands together
and start rubbing them together slowly.
Do they still feel cold?
2. Now start rubbing them together
really fast. How do they feel now?
Are they warmer?
3. Next, try rubbing your hands up
and down your thighs really fast.
This will warm both your hands and
4. Try crossing your arms and rubbing
your hands up and down the tops of
your arms really fast. This will warm
both your hands and arms.
Note: Try holding your breath
and rubbing your hands together. Do
you think your hands got warmer faster?
This is called friction.
When you rub things together you create
friction and friction is what causes