Discussion06

# Discussion06 - First Midterm • Next Thursday February 2...

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Unformatted text preview: First Midterm • Next Thursday, February 2 • Clock starts at 6:00 pm; be in your seat at 5:50 pm • Location: MLB (next to clock tower), Auditorium 3 • Alternate seating; no seating outside the columns • Must have UM ID and #2 pencil(s) • Closed-book , 90 minutes, multiple-choice, 20 questions, no penalty for guessing • Can have one 3”×5” notecard (double-sided) with any formulas/equations/diagrams • Can have a calculator that looks like a calculator • No laptops, no cell phones, no text-messaging devices, no communication devices of any type First Midterm • Please make sure you enter your form number on your scantron • Please make you enter your section number (200) on your scantron • Please make you enter your UM ID number on your scantron • It is in your best interest to enter all three numbers correctly, so make sure you do it Application of General Physics I Mechanics Racquetball Striking a Wall Newton’s Laws Physics 140 Mt. Etna Stewart Hall Friction F • Yet another phenomenological contact force arising from electromagnetic interactions • Prevents sliding of objects along their interface with respect to each other when their surfaces are in contact • Arises from the microscopic roughness of surfaces • Directed parallel to the interface , opposing relative motion of the two surfaces, be that actual or potential motion (i.e. if friction did not act) • Can think of it as a parallel component of the contact “reaction force” • What about the magnitude of the friction force? Magnitude of the friction force • Two regimes : static friction and kinetic friction...
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## This note was uploaded on 02/15/2012 for the course PHYS 140 taught by Professor Uher during the Winter '10 term at University of Michigan.

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Discussion06 - First Midterm • Next Thursday February 2...

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