A very good presentation on turning effect with almost everything you need to know. Few question at the end for you guys. Let's see if you can solve them. Good Luck

1. The turning
effects of forces
Prepared by: Hashmatullah

2. Moment
• When a force acts on an object which has a
pivot, it creates a turning effect or moment.
When forces are used to open doors, steer and
pedal bicycles or turn a tap; they are causing
turning effect.
• 𝑀𝑜𝑚𝑒𝑛𝑡 𝑜𝑓 𝑎 𝑓𝑜𝑟𝑐𝑒 = 𝑓𝑜𝑟𝑐𝑒 × 𝑝𝑒𝑟𝑝𝑒𝑛𝑑𝑖𝑐𝑢𝑙𝑎
𝑟 𝑑𝑖𝑠𝑡𝑎𝑛𝑐𝑒 𝑓𝑟𝑜𝑚 𝑡ℎ𝑒 𝑝𝑖𝑣𝑜𝑡 𝑀𝑜𝑚𝑒𝑛𝑡 = 𝐹 × 𝑑
• Where F is measured in Newton, d is
measured in meters, the moment is measured
in Nm
• The moment of a force is a vector quantity
that can only have one of two directions;
either clockwise or anticlockwise.

3. Problem solving

4. Moment
factor
• The moment of a force is bigger if the force
is bigger.
• The moment of a force is bigger if it acts
further from the pivot.
• The moment of force is greatest if it acts at
90ᵒ to the object it acts on.

5. Conditions for
equilibrium
• The forces on it must balance as well as their
turning effect.
So
• The sum of the forces in one direction must equal
s to the sum of the forces in the opposite direction.
• The principle of moments must be applied.
The principle of moment states that, when a
system or an object is in equilibrium the sum of the
clockwise moments will be equal to the sum of the
anticlockwise moments on the system or the object.