# PHYS 1 Lecture Notes - Lecture 9: Friction

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8 Feb 2017
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
Magnitude
Direction
Kinetic Friction
 
Opposite of the relative motion between objects
to the surface
Static Friction
 
Kinetic friction
= coefficient of kinetic friction
Static friction
should be slightly larger than
= coefficient of static friction
Example 1: A string is attached to a block and the block is pulled to the right with a horizontal tension force
of . While this force is applied, the block slides with a constant speed of . What is the kinetic
friction on the block?

   
  

 
Use Newton's Second Law in the x direction
What is the coefficient of kinetic friction?
 

Lecture 9
Tuesday, February 7, 2017
5:35 PM
PHYS 1 Page 1
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