1. Friction and Thermal Energy

2. Friction is a Force Force is a push or pull of something
Friction is the the force that acts in the OPPOSITE direction of the applied force
i.e. if you slide your feet to the right the friction is pushing/pulling to the left

3. Friction Happens Resistance occurs between solid and gas/liquid
Between solid objects

4. Decrease friction by Using a liquid (i.e. oil to a motor)
Cars have a lot of moving parts and many solid components moving one another
The application of oil can decrease the friction
Decreasing friction = greater mechanical efficiency

5. So why does Friction produce thermal energy?
In the case of the two books sliding past one other
The energy you put into the books increases the particle within the books.

6. A Molecular Look
When two surfaces slide passed one another “weak intermolecular bonds” occur between the two surfaces
Bonds occur between particles electrons
As the surface continues to move these it breaks the bonds causing the particle to “spring” or “bounce” back into shape
This sends the particle into motion
This continues increasing Kinetic Energy therefore increasing temperature