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Moments

Moments. Learning Objectives :. To fully understand what is meant by the moment of a force To be able to solve problems involving moments. Most of this should be revision of Year 9 and GCSE. Book Reference : Pages 97-98. Levers in everyday life.

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Moments

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  1. Moments

  2. Learning Objectives : To fully understand what is meant by the moment of a force To be able to solve problems involving moments Most of this should be revision of Year 9 and GCSE Book Reference : Pages 97-98

  3. Levers in everyday life We are familiar with levers in everyday life, they make our life easier..... GIVE ME A PLACE TO STAND AND I WILL MOVE THE EARTH

  4. Definitions The moment of a force about any point is defined as the force multiplied by the perpendicular distance from the line of action to the point Force f Perpendicular distance d Point Moment = f x d Units are Nm

  5. The Principle of Moments 1 If a body is acted upon by more than one force and it is in equilibrium then the turning effects of the forces must also balance out: W1d1 = W2d2 d1 d2 W1 W2 Pivot or Fulcrum

  6. The Principle of Moments 2 The sum of all the anticlockwise moments The sum of all the clockwise moments = = The sum of The sum of d1 d2 W1 W2 Pivot or Fulcrum

  7. The Principle of Moments 3 The sum of all the anticlockwise moments The sum of all the clockwise moments = W1 W2 W3 W4 Pivot or Fulcrum Even with more complex systems the same fundamental rule applies

  8. Non-Perpendicular Forces When the force is not perpendicular we use our skills of resolving...... Force f Perpendicular Force 90-θ° Perpendicular distance d θ° Point Moment = f cos (90 - θ) x d

  9. Video :Eureka! 12Warning :When considering masses, (kg) causing moments it is easy to forget to convert the mass to a force (weight). Numerically, it doesn’t seem to matter but you will lose marks since it shows poor conceptual understanding

  10. Summary :The principle of moments changes little from KS3 to KS4 to KS5 Our skills at resolving forces into components can be utilised to deal with forces which are not perpendicular to the distance from the pivot

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