by on June 15, 2020
191 views

Equilibrium under moment of forces

A body is said to be in equilibrium when the resultant moment on the body is zero.

The resultant force and acceleration are also zero. Then the body does not rotate or move.

 

Moment of a body in Equilibrium

 

The Principle of Moments

It states that the sum of the clockwise turning moments acting upon a body  at any point equal the sum of the anticlockwise turning moment about the same point, provided that the body is in equilibrium.

Mathematically,

FL  clockwise= FL anticlockwise

   

 

Where

 

From fig 1 above

 

 

EXAMPLE

If the system in fig 1 above is in equilibrium and

                                                          

 

Solution

 

 

Consider the figure 2 above

 

 

Read more about PHYSICS for High Schools

Posted in: Education
Be the first person to like this.