This preview shows pages 1–4. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Physics 140 Fall 2007 lecture 7 : 25 Sep Notices: first midterm exam Thursday, 4 Oct, 6:007:30 pm Review next TUESDAY evening (8pm, 182 Dennison) discussion section reviews on Wed, 3 Oct need alternate time? Explain your situation in an *** email to: phys140lecture@umich.edu *** practice exam posted to CTools (under Exams & Grading) Ch 5 topics: friction circular motion dynamics HW Set 1 HW Set 2 total score score per problem time per problem HW Set 3 (as of Mon, 6pm) Note: closes in 1 day, 6 hours! Two identical masses are attached to either end of a very light rope draped across the very light pulley as shown. If angle A is a right angle, then the acceleration of the righthand block in the idirection, expressed in terms of the tilt angle ! , is 1. 2 g cos ! 2. ( g/2 ) sin ! 3. 2 g (cos ! sin ! ) 4. ( g/2 ) (sin ! + cos ! ) 5. ( g/2 ) (cos ! sin ! ) ! A i Frictional Forces At the contact surface between , the component of force directed parallel to the surface is known as friction . Static friction acts to keep an object at rest (static) against its contact surface. It can take on any magnitude up to a maximum value f s < f s MAX = s n where n is the normal force acting on the object at the surface....
View
Full
Document
 Fall '07
 Evrard
 Circular Motion, Friction

Click to edit the document details