12. Principle of moments
The principle of moments states that when in
equilibrium the total sum of the anti clockwise
moment is equal to the total sum of the clockwise
moment
When something Is balanced about Pivot.
The total clock wise moment = The total anti clock
wise moment.
15. Position Of The Resultant
force
It is also known as Analytical method
The position of a resultant force may be find out by moments.
As will be discussed on the Next slide.
16. First of all, Find out magnitude and direction of the resultant force by
method of resolution.
Now equate the moment of the resultant force with the algebraic sum of
moments of the given system of forces about any point.
This may also be find out by equating the sum of clockwise moments and
that of anti clock wise moment about the point, through which resultant will
pass.
17. Lever
A lever is rigid bar (straight, curved and bent) and is hanged at any point.
It is free to rotate about the hinged end called fulcrum.
The common examples of the use of lever are crow bar, pair of scissors, fire
tongs, etc.
19. Simple Lever
A lever which consist of one bar having one fulcrum is known as “Simple
Lever”.
A simple lever may be straight, curved or even bent.
20.
21. Compound Lever.
A lever, which consists of a number of simple levers is known as “Compound
Lever”.
The platform weighing machine is an simple example of a compound lever.
