Conditions for equilibrium
Stationary object = forces acting on it are balanced = resultant force is zero.
When an object does not rotate, the clockwise and anticlockwise moments acting on it are balanced (the resultant moment is zero) .
 The force is trying to turn the seesaw
anticlockwise
about the pivot
 The force is trying to turn the seesaw
clockwise
about the pivot
Example:
An uneven seesaw:
 To know and state the principle of moments for a body in equilibrium.
 Apply the principle of moments to new situations or to solve related problems.
0.15m
Turning Effects
of forces
Turning Effects of a Force
Moment (Nm) = Force(N) x distance from pivot(m)
Thus, an object in equilibrium must satisfy the following conditions:

The resultant force on the object is zero

The resultant moment on the object is zero
If the seesaw balances, the turning effect anticlockwise must equal the turning effect clockwise
Today's
Lesson:
we have learnt that:
a simple example:
50N
pivot^
Moment = Force x distance from pivot
Moment = 50 N x 0.15 m
Moment = 7.5 Nm //
What if... there's
more than 1 force?
*not drawn to scale
If the seesaw is balanced, what must be the distance from the pivot to the car?
202N
110N
?
2.2m
Anticlockwise moment = clockwise moment
Distance:202 x ? = 110 x 2.2
202 x ? = 242
? = 242/202
= 1.198m
= 1.20m
∴Therefore ? = 1.20m//
hence...
The Principles of Moments states that when a body is in equilibrium (balanced), the sum of clockwise moments about a pivot is equal to the sum of anticlockwise moments about the same pivot.
therefore...
conclusion:
The Principles of Moments states that when a body is in equilibrium (balanced), the sum of clockwise moments about a pivot is equal to the sum of anticlockwise moments about the same pivot
An object in equilibrium must satisfy the following conditions:
The resultant force on the object is zero
The resultant moment on the object is zero
Thank you (:
anticlockwise
clockwise
~Moment~
Bet u never saw this coming (;
More Questions!!
love the quality.
Question 1:
Question 2:
the quality is getting btr i swear >_>
The Diagrams show a uniform rod with its mid point on a pivot. 2 equal forces, F are applied to the rod. Which Diagram shows the rod in
 Equilibrium
 Turning
In this experiment, 6 identical bags of flours are balanced by a 9kg mass. 2 bags of flour are removed. What mass will balance the remaining bags?
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Turning Effects of forces
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