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# Turning Effects of forces

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## SnowHime Sama

on 16 April 2015

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#### Transcript of Turning Effects of forces

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 see-saw
anticlockwise
- The force is trying to turn the see-saw
clockwise

Example:
An uneven see-saw:
- 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 see-saw 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 see-saw is balanced, what must be the distance from the pivot to the car?

202N
110N
?
2.2m
Anti-clockwise 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 (:

anti-clockwise
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?
Full transcript