# lecture15 - Centre of Mass Centre of Mass Centre of Gravity...

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1 Physics 1D03 Centre of Mass Serway 12.1-12.3; and parts of 9.5 Centre of Mass, Centre of Gravity Rigid-body equilibrium Practice problems: Chapter 9, problems 35, 37 Chapter 12, problems 3, 4, 5, 15. Physics 1D03 The uniform beam (weight 4.00 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?

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2 Physics 1D03 Quiz: The uniform beam (weight W , 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 at distance ¾ L from the pin? scale A) 0.5 W B) 0.67 W C) 0.75 W D) 1.33 W E) 1.5 W 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”.
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