Upload
allyson-mills
View
223
Download
3
Tags:
Embed Size (px)
Citation preview
Friction
• Friction always opposes motion or the applied force (called a non-conservative force)
• Force due to the rubbing of two surfaces against each other
• Typically…..
• 0< μ < 1
• 0 would be “frictionless” and μ=1 is really “sticky”
5.29 micrometer (μm) = 1/500 inch
A magnified view of a frictionless coating
The road from static to kinetic friction
Friction (types)
• Kinetic Friction: this is moving friction
• Static friction: this is non-moving friction
• Static friction > sliding friction
Both friction types are defined by the coefficient of friction, μ (either kinetic, μk or static, μs)
Fiction Equations
k k N
s s N
f F
f F