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Unformatted text preview: 1 Physics 1D03 - Lecture 9 Lecture 9 Lecture 9 Newtons Laws applied to systems with two or more accelerated bodies. Serway and Jewett 5.7, 5.8 Practice Problems: - Complete the examples in todays 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 Atwoods Machine Calculate the acceleration of the blocks. Assume :- no friction- massless rope and pulley- rope doesnt stretch Plan: free-body diagram for each mass relate tensions, accelerations use Newtons 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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- Fall '09