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10_04_Friction - 10/4 Friction 0 Text Chapter 4 section 9...

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10/4 Friction 0 Text: Chapter 4 section 9 friction 0 HW 10/4 “Skier” Handout due Monday 10/8 0 For Friday, Potential Energy: sections 6.3-5
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Friction: 0 Always acts parallel to the surface of contact 0 Comes in two flavors: static and kinetic 0 Static: no relative motion of surfaces 0 Kinetic: relative motion of surfaces (sliding)
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Jack tries to pull a box but can’t. Draw a FBD of the box. W E,B N F,B a = 0 T S,B f F,B What’s Wrong? Box Since a = 0 so should F net = 0.
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Jack tries to pull a box but can’t. Draw a FBD of the box. W E,B N F,B a = 0 T S,B f F,B Now Jack pulls harder but the box still doesn’t move. What changes? Box
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Jack tries to pull a box but can’t. Draw a FBD of the box. W E,B N F,B a = 0 T S,B Now Jack pulls harder but the box still doesn’t move. What changes? f F,B The static friction force is whatever it needs to be , given the situation. Box The static friction force increased.
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Accelerating Truck with Same Box Draw a FBD of the box. a = 2 m/s 2 left W E,B N T,B W and N stay the same. Any other forces?
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