HEAT using Friction - Science Experiment (Thermodynamics with a hanger)
Channel: Kids Fun Science
Date: 2018-01-06

HEAT using Friction - Science Experiment (Thermodynamics with a hanger)
This is made for parents and teachers

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HEAT using Friction - Science Experiment
Rub your hands together quickly. Notice anything? Your hands should be warming up as you watch this video. How does this happen? Well any object, no matter how smooth it is, when rubbed against another, produces friction. 

Friction is the force that opposed motion caused by tiny imperfections on the surfaces running over each other.

WHY DOES FRICTION CAUSE THINGS TO HEAT UP?
As these rough surfaces come into contact with each other they repel. When two atoms are brought very close together they store potential energy. When they move apart that energy becomes kinetic.

The harder you press and the faster you rub the more friction, and there for the more heat, you generate. Rubbing the materials uses kinetic energy which is then transfered into heat energy as the atoms in the materials move and vibrate. The different materials transfer heat differently

When you bend the metal wire back and forth like this, there are no surfaces rubbing together. But within the metal there are atoms of copper or whatever wire you found still moving past each other. This rapid motion is turned into heat, and metal, being a great conductor of heat and electricity, will pass this heat along itself. 

MATERIALS:

• Wire coat hanger
• Wooden dowel
• Plastic pen
• Cardboard 

PROCEDURE:
Rub each material slow and fast and tight and loose and feel how hot each one gets and how long it last. Use opposite hand to feel the heat.

Then take the piece of wire coat hanger and bend it back and forth rapidly
Hold your hands close together so you can isolate the bending right in one spot
BE VERY CAREFUL as if you move it very fast it will be very HOT and can burn you.
Don’t do this too much… it might overheat!

WIRE COAT HANGER EXPLATION: 

From before, friction is the force that opposes motion. When you bend the metal back and forth like this, there are no surfaces rubbing together. But within the metal there are atoms of copper still moving past each other. This rapid motion is turned into heat, and metal, being a great conductor of heat and electricity, will pass this heat along itself. 

What should happen in this experiment, and why?
The harder you press and the faster you rub the more friction, and there for the more heat, you generate. Rubbing the materials uses kinetic energy which is then transferred into heat energy as the atoms in the materials move and vibrate. The different materials transfer heat differently because they are more, or less, thermally conductive. thermodynamics science experiments for kids