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Turning Effect of Forces - Coggle Diagram
Turning Effect of Forces
Moment
Moment of force = Fx perpendicular distance from line of action of force to pivot to line of action of force
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Principle of moments
A body in equilibrium, sum of clockwise moment bout pivot = sum of anticlockwise moment bout same pivot
Rf=0, resultant moment on obj =0
Centre of gravity
How to find
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Irregular shape --> use experiment
-have 2 seperate points, where pendulum bob is not moving
-draw a dotted line for each point, have a cross where both lines intersect
-draw a 3rd point to check if the cross is the centre of gravity/ balance using a finger to see if it is centre of gravity. It should not tilt (without any external factors such as wind)
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Stability
Types of equilibrium
Unstable --> cg drops; line of action through its weight lies outside base; moment of its weight bout contact point cause cone to topple
Neutral --> cg remains same height; line of action through its weight and contact force coincide; moment of its weight bout contact point is 0, stays in position to which it is displaced
Stable --> cg rises bfore returning its original height; line of action through its weight still lies within its base; moment of is weight bout contact point cause cone to go back to its original position
Increase
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Make base area wider so there is more space which the line of action would not go out of base area easily, hence able to tilt it by a larger angle