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# lecture15 - TEST 1 bring a pencil 2 don't use a pen on the...

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Physics 1D03 TEST 1) bring a pencil 2) don't use a pen on the scan sheet , the computer actually won't read it (ie: you get 0!) 3) code in your student number correctly in the little circles 4) answer question 1, which will tell us the correct version 5) don't wait until time is called and expect to get extra time to transfer your answers to the scan sheet 6) 9 MC and 4 long

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Physics 1D03 Answer to first question is version number 0612345 J. P. Student Multiple-choice answer sheets: HB pencil only; ink will not work Fill circle completely No extra marks in answer area Erase well to change an answer
Physics 1D03 Centre of Mass Serway 12.1-12.2; and parts of 9.5 Centre of Mass, Centre of Gravity

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Physics 1D03 Example: The uniform beam (weight 400 N, length L) is supported by a pin at one end, and a scale that can be placed anywhere along the beam. What will the scale read if it is scale a) at the end of the beam (shown)? b) at the centre of the beam? c) at distance ¼ L from the pin? d) at distance ¾ L from the pin?
Physics 1D03 Where should we choose the “pivot point” when calculating torques? Answer: In Statics problems , it doesn’t matter. Theorem : If the net force on a body is zero , then the total torque due to all forces will not depend on the choice of “pivot point”. In particular, if F net = 0, then if τ net = 0 for one “pivot point”, τ net is also zero for every other pivot point.

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Physics 1D03 The centre of mass is an “average position” of the mass.
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