Mechanics

Statics and Force

Scalars and Vectors

Force

Resolution of forces into components

A Moment

Free Body Diagram

Inclined Plane

Cable, Rope, or Chain

Roller or Simple Support

Pin or Hinge

Equilibrium

Steps In Solving A Statics Problem

Example #2

Example #3

Authored for presentation by: Prof. Martha Selby

Revised by: Lex Jacobson

HTML Documentation by: Larry Genalo Jr.

Date last updated: 7/24/96

3 Branches of Mechanics:

- Statics

- Dynamics

- Strength of Materials

A person pushing on a wall

Gravity pulling on a person

- Magnitude

- Direction

- Point of Application

3 steps in drawing a free body diagram:

- Isolate the body, remove all supports and connectors.

- Identify all EXTERNAL forces acting on the body.

- Make a sketch of the body, showing all forces acting on it.

- Draw a free body diagram.
- Choose a reference frame. Orient the X & Y axes. (Most often X is chosen in the horizontal direction and Y is chosen in the vertical direction.)
- Choose a convenient point to calculate moments around.
- Apply the 3 equilibrium equations and solve for the unknowns.