# Turning forces and centre of mass

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• Created by: Jasmin
• Created on: 18-04-13 18:42
• Turning Forces and Centre of Mass
• Moment = turning effect of a force
• Moment (Nm) = Force (N) x Perpendicular distance from the line of action of the force to the pivot (m)
• Larger force larger moment
• Distance from pivot greater, greater moment
• To get maximum moment need to push at right angle to object
• CENTRE OF MASS = point at which its mass may be thought to be concentrated
• Centre of mass directly below point of suspension - when stops - equilibrium
• Freely suspended object will swwing until its centre of mass is vertically below point of suspension
• Rest in this position becaue no moment - pivot is in line with the line of action of the force
• To find centre of mass
• Suspend shape and plumb line from same point, wait until stops moving
• Draw line along plumb line
• Do same but suspend shape from different pivot
• Centre of mass is where the lines meet
• Of symmetrical object
• Along lines of symmetry where meet