February+1,+2013

Today in class:

[|Conversion Exercises]

[|Challenge]

[|Our Class Motion Website]

Bill Nye Notes The harder things are rubbing together, the more friction there is.

Friction turns work into heat.

Friction is everywhere.

Friction holds knots together.

There is friction in space, there are gas molecules and gravity. Finger prints/grooves help you hold on to small or smooth things.

The edges of coins have ridges to help you hold them. Cleats make friction.

They make it easier to stop and go.

Rubber has a lot of friction. When skis rub against the snow it makes heat so the snow turns into a thin layer of water. A world without friction would be dangerous.

Sliding friction, fluid friction and rolling friction.

Bowling uses all three types of friction.

Fish are smooth and slippery so they can slide through the water. Crickets use friction to make their sound.