3-in-1 Alternative Energy Car DIY STEM Kit
$19.99$12.95
Materials | Coeff. of Static Friction s | Coeff. of Kinetic Friction k |
---|---|---|
Steel on Steel | 0.74 | 0.57 |
Aluminum on Steel | 0.61 | 0.47 |
Copper on Steel | 0.53 | 0.36 |
Rubber on Concrete | 1.0 | 0.8 |
Wood on Wood | 0.25-0.5 | 0.2 |
Glass on Glass | 0.94 | 0.4 |
Waxed wood on Wet snow | 0.14 | 0.1 |
Waxed wood on Dry snow | - | 0.04 |
Metal on Metal (lubricated) | 0.06 | |
Ice on Ice | 0.1 | 0.03 |
Teflon on Teflon | 0.04 | 0.04 |
Synovial joints in humans | 0.01 | 0.003 |