lecture9 - 1 Physics 1D03 Lecture 9 Lecture 9 Lecture 9 •...

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Unformatted text preview: 1 Physics 1D03 - Lecture 9 Lecture 9 Lecture 9 • Newton’s Laws applied to systems with two or more accelerated bodies. Serway and Jewett 5.7, 5.8 Practice Problems: - Complete the examples in today’s lecture.- Chapter 5 : 31, 43, 67, 69 Physics 1D03 - Lecture 9 Problems with several accelerated objects: • Free-body diagram for each object. • Relate forces by finding action-reaction pairs, etc. • Look for constraints on the motion to relate accelerations. • “F=ma” for each diagram, break into components. • Count unknowns: do you have enough equations? • Use algebra to solve. 2 Physics 1D03 - Lecture 9 Atwood’s Machine Calculate the acceleration of the blocks. Assume :- no friction- massless rope and pulley- rope doesn’t stretch Plan: • free-body diagram for each mass • relate tensions, accelerations • use Newton’s second Law m 1 m 2 Physics 1D03 - Lecture 9 Forces on m 1 T 1 m 1 g T 2 m 2 g Forces on m 2 a 1 a 2 • Tensions are equal (“ideal” pulley, light rope) • Accelerations are equal in magnitude ( why? ), opposite in direction 3...
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This note was uploaded on 01/13/2011 for the course PHYSICS PHYSICS 1D taught by Professor Mckay during the Fall '09 term at McMaster University.

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lecture9 - 1 Physics 1D03 Lecture 9 Lecture 9 Lecture 9 •...

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