# Equilibrium of Parallel Force

Equilibrium of parallel force

11/09/2012

By:

Camilo Salazar

Jillian Ellis

Purpose:

To understand the conditions need for a rigid body to be in equilibrium when there are forces acting on the body from different sides.

Theory:

When force is applied on a rigid body for example a ruler it can either be in equilibrium or it can be unbalance. When the force is unbalance what would happen is this motion the body can be either translational or rotational. “A body in translational motion is when all the points within it move in lines that are parallel to each other.”(Physics lab pg.81). Rotational motion is when all points move in a circle motion within or outside the body. A body can have both states at the same time.

An unbalance forces will make some sort of motion but when the force are equal to each other they will cancel each other out. This will cause the body to be in a state of equilibrium. There are three conditions to put the body in equilibrium. Condition one “The sum of all forces acting vertically upwards (on a body) must be equal to the sum of all forces acting vertically downward.” (Physics lab pg.81). Condition two: “The sum of all forces acting horizontally to the right must be equal to the sum of all forces acting horizontally to the left. Condition 3: The sum of all of all clockwise torques must be equal to the sum of all the counterclockwise torques. The torques due to a force about a point is defined as the product of the force and the perpendicular distance from the point to the line of action of the force. This can also be written as Tcm=Tccm. Equipment:

Ruler

Weights

A metal poll

Hangers

Procedure:

The first thing we did to start this lab was to set up the experiment and find the equilibrium point. This can be bit tricky because you have to be sure that everything is equal and it not being tilled. Once this is done you will add weight and measure the point from the origin to see what the distance was...

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