# Important Concepts in Statics of Rigid Bodies

These points are taken from the book of Russel Hibbeler:

• Statics is the study of bodies that are at rest or move with constant velocity.
• A particle has a mass but a size that can be neglected, and a rigid body does not deform under load.
• A force is considered as a “push” or “pull” of one body on another.
• Concentrated forces are assumed to act at a point on a body.
• Newton’s three laws of motion should be memorized.
• Mass is a measure of a quantity of matter that does not change from one location to another. Weight refers to the gravitational attraction of the earth on a body or quantity of mass. Its magnitude depends on the elevation at which the mass is located.
• In the SI system the unit of force, the newton, is a derived unit. The meter, second, and kilogram are base units.
• Prefixes , , , , and are used to represent large and small numerical  quantities. Their exponential size should be known, along with the rules for using the SI units.
• Perform numerical calculations with several significant figures, and then report the final answer to three significant figures.
• Algebraic manipulations of an equation can be checked in part by verifying that the equation remains dimensionally homogeneous.
• Know the rules for rounding off numbers.