Equilibrium By Devashish Pahadi
Index • Definition of Equilibrium • Conditions for Equilibrium • Principle of Moments • Couple
What is Equilibrium? • 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 • The resultant forces acting on a body must be equal to zero. • The resultant moment of forces acting on a body, in all points must be zero.
Principles of Moments • 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 • When two parallel forces which are equal and opposite are not acting on the same line, a couple is formed. • 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 • 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_01a.jpg • http://cnx.org/resources/9fc2dfd54e43bcc9c78e861e2910c644/Figure_10_02_01a.jpg • http://astarmathsandphysics.com/a-level-physics-notes/forces-and-motion/a-level-physics-notes-couples-html-m5e2898fa.gif • http://ap-physics.david-s.org/1-5-c-conditions-equilibrium/