Equilibrium
By Devashish Pahadi
Index
O Definition of Equilibrium
O Conditions for Equilibrium
O Principle of Moments
O Couple
What is Equilibrium?
O Equilibrium is defined as the state of a body when it
is at rest or in a non-accelerated motion when all the
resultant force acting on it are zero and also when
the sum of all torques about an axis are zero.
Conditions for Equilibrium
O The resultant forces acting on
a body must be equal to zero.
O The resultant moment of forces
acting on a body, in all points
must be zero.
Principles of Moments
O When a body is in equilibrium, the sum of all
anticlockwise moments of any points must
be the same as the sum of all clockwise
moments of the point.
Couple
O When two parallel forces
which are equal and
opposite are not acting on
the same line, a couple is
formed.
O The moment of couple is
equal to the product of
either force and the
perpendicular distance
between the line of action
of both the forces.
Bibliography
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http://4.bp.blogspot.com/2v_SzrpSsGo/URxZtOjrqDI/AAAAAAAABP8/aPhl0drRudw/s1600/trial-balance.jpg
http://thecrackeddoor.com/Main/wp-content/uploads/2013/01/balance.jpg
http://herrick.bol.ucla.edu/GK12/Lessons/Week2/images/see-saw.png
http://herrick.bol.ucla.edu/GK12/Lessons/Week2/images/see-saw.png
http://cnx.org/resources/15f4e2ea18e681b7b82cd75574bcfd4b/Figure_10_01_01
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http://astarmathsandphysics.com/a-level-physics-notes/forces-and-motion/a-levelphysics-notes-couples-html-m5e2898fa.gif
http://ap-physics.david-s.org/1-5-c-conditions-equilibrium/