state of equilibrium

                                                                                   

We did a lab report during the last semester talking about the equilibrium force on the force table which calculate the equal force in different angles.

When all the forces that act upon an object are balanced, then the object is said to be in a state of equilibrium. The forces are considered to be balanced if the rightward forces are balanced by the leftward forces and the upward forces are balanced by the downward forces. If an object is at equilibrium, then the forces are balanced. Balanced is the key word that is used to describe equilibrium situations. Thus, the net force is zero and the acceleration is 0 m/s/s. Objects at equilibrium must have an acceleration of 0 m/s/s. This extends from Newton's first law of motion.

The important rule to make a great bridge which can afford huge weight is separate the force to all parts of the bridge, so the angles and arch can help with this problem.

http://www.physicsclassroom.com/class/vectors/u3l3c.cfm