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© Boardworks Ltd 2003 Moments. © Boardworks Ltd 2003 Core Describe the moment of a force as a measure of its turning effect and give everyday examples.

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Presentation on theme: "© Boardworks Ltd 2003 Moments. © Boardworks Ltd 2003 Core Describe the moment of a force as a measure of its turning effect and give everyday examples."— Presentation transcript:

1 © Boardworks Ltd 2003 Moments

2 © Boardworks Ltd 2003 Core Describe the moment of a force as a measure of its turning effect and give everyday examples describe, qualitatively, the balancing of a beam about a pivot.

3 © Boardworks Ltd 2003 Turning forces Two masses on a see-saw. What force acts on the masses? Which way will the see-saw go? pivotgravity The see-saw turns around the pivot. What factors effect the size of a turning force?

4 © Boardworks Ltd 2003 Moments The size of the turning force or moment depends upon: 1.The distance of the force from the pivot. 2.The size of the force. Moment = Force x perpendicular distance from pivot Moments measured in Newton metres (Nm) Force measured in Newtons (N) Distance measured in metres (m)

5 © Boardworks Ltd 2003 Principle of moments Anticlockwise moments = Clockwise moments Where should a force of 50N be positioned to balance the see-saw? Anti-clockwise moments = 25 N x 2 m = 50 Nm Clockwise moments = 50 N x ? m Anti-clockwise moments = Clockwise moments 50 Nm= 50 N x ? M distance= 1 m 25N 2 m1 m 50N

6 © Boardworks Ltd 2003 Principle of moments Drag and drop any of the masses onto the “see – saw” and try to get it to balance. The masses are in kilograms and the distance in metres.

7 © Boardworks Ltd 2003 Moments questions 1.Where should a force of 60N be positioned to balance the ruler below? 2.What size force should be positioned on the left to balance the ruler shown? 15N 4 m1 m 60N 15N 4 m1 m ? NForce = 60 N

8 © Boardworks Ltd 2003 Beams What if the pivot is not in the middle of the ruler? The ruler´s weight causes another moment at the centre of mass.

9 © Boardworks Ltd 2003 Supplement Perform and describe an experiment (involving vertical forces) to verify that there is no net moment on a body in equilibrium. Apply the idea of opposing moments to simple systems in equilibrium.

10 © Boardworks Ltd 2003 Notes P54&5 Answer all questions


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