Notes6 - Chapter 6 Frictional Forces Two types static – applies to stationary objects kinetic – applies to sliding(moving objects Like the

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Chapter 6: Frictional Forces Two types:- static – applies to stationary objects- kinetic – applies to sliding (moving) objects Like the normal force, the Frictional Force is a contact force, but acts parallel to the interface of two objects y x n m g F A f Apply Newton’s 2 nd Law F y = N − mg = ma y = ∑ N = mg F x = F A − f = ma x ∑ If applied force is small, book does not move ( static ), a x =0, then f=f s Increase applied force, book still does not move Increase F A more, now book moves, a x ≠ 0 S A f F = S x S A x S A f ma f F ma f F > + = ⇒ = − There is some maximum static frictional force, f s max . Once the applied force exceeds it, the book moves f S max = μ S N • μ s is the coefficient of static friction, it is a dimensionless number, different for each surface-object pair (wood-wood, wood-metal); also depends on surface preparation • μ s does not depend on the mass or surface area of the object • Has value: 0 < μ s < 1.5 • If no applied vertical force Magnitudes not vectors mg f S S μ = max...
View Full Document

This note was uploaded on 12/10/2011 for the course PHY 1111 taught by Professor Stencil during the Fall '11 term at University of Georgia Athens.

Page1 / 11

Notes6 - Chapter 6 Frictional Forces Two types static – applies to stationary objects kinetic – applies to sliding(moving objects Like the

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online