PAP111_Lecture06

# PAP111_Lecture06 - PAP111 Lecture6 NewtonsLaws Force...

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PAP 111  Mechanics and Relativity  Lecture 6 Newton’s Laws  Frictional and Resistive Forces

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Friction Force and Resistive  Force When an object is in motion on a surface or  through a viscous medium, there will be a  resistance to the motion. This is due to the interactions between the object  and its environment. Frictional Force  arises when the resistance  come from  surface contact . Resistive Force  arises from  the motion  of  the object  through a viscous medium
Friction Forces Frictional forces can be categorized as:  Static Friction  and  Kinetic Friction . Static Friction  arises when the object  is not in motion. Kinetic Friction  occurs when the  object is in motion.

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The Physics of Frictional  Force Friction arises from the contact of rough  surfaces – the contact is made at a few  locations where peaks of the material  touch. Frictional force occurs because One peak physically blocks the motion of  a peak from the opposing surface –  through electrical interaction between  atoms and molecules in the peak. Chemical bonding of opposing peaks  (“spot welds”) as they come into contact.
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• Fall '10
• Claus-DieterOhl
• Trigraph, Resistive  Force

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