Doc at:
https://www.slideshare.net/PlazPhysics/moment-igcse-selected-pat-year-with-answer
For Moment part 1
https://youtu.be/pQyex45th40
Simplify the concept of Moment.
Moment = Force X perpendicular distance
Perpendicular distance must measure from Pivot to Force.
2 condition when the system is Balanced (Equilibrium)
1) Sum of clockwise moment = Sum of anti-clockwise Moment.
2) Resultant force = 0 N.
How to answer the question?
Example Pass Year question:
Oct/Nov 2015 and Oct/Nov 2014.
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