# lecture17 - Physics 101 Lecture 17 Pg 1 Exam III Exam 2 is...

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Unformatted text preview: Physics 101: Lecture 17, Pg 1 Exam III Exam 2 is Mon Oct. 31, 7pm No review (see 101 web) Extra office hours Physics 101: Lecture 17, Pg 2 Complains: lectures are moving too fast big break between exams and lectures quizzes are too difficult Suggestion: use blackboard to solving problems Useful practical suggestion: You should bring donut holes for everyone to lecture. Physics 101: Lecture 17, Pg 3 A block of mass M 1 = 3 kg rests on a table with which it has a coefficient of friction µ = 0.73 . A string attached to the block passes over a pulley to a block of mass M 3 = 5 kg . The pulley is a uniform disk of mass M 2 = 0.7 kg and radius 15 cm . As the mass M 3 falls, the string does not slip on the pulley. M 3 T 3 M 3 g M 2 T 3 T 1 M 1 N M 1 g T 1 f Newtons 2 nd Law 1) T 1 – f = M 1 a 1 2) T 1 R – T 3 R = I α 2 3) T 3 – M 3 g = M 3 a 3 x y Notes: 1) f = μ M 1 g 2) α 2 = -a 1 / R 3) I = ½ M R 2 4) a 1 = -a 3 Rewrite (a = a 1 ) 1) T 1 = M 1 (a+ μ g) 2) T 3 – T 1 = ½ M 2 a 3) T 3 = M 3 (g – a) Physics 101: Lecture 17, Pg 4 Σ F = m a Σ F Δ x = Change in Kinetic Energy Σ F Δ t = Change in momentum Στ = I α Τ oday: apply these ideas to molecules in fluids Physics 101: Lecture 17, Pg 5...
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## This note was uploaded on 02/05/2012 for the course PHYS 101 taught by Professor Ha during the Spring '11 term at University of Illinois at Urbana–Champaign.

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lecture17 - Physics 101 Lecture 17 Pg 1 Exam III Exam 2 is...

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