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Force can be thought of simply as a push or pull, but is more clearly defined as any action on a body that tends to change the velocity of the body. Weight is a force exerted on an object due to the object's position in a gravitational field.
In studying the effect of forces on a body it is necessary to isolate the body and determine all forces acting upon it. This method of using a free-body diagram is essential in understanding basic and complex force problems.
Knowledge of the forces required to maintain an object in equilibrium is essential in understanding the nature of bodies at rest and in motion.
When determining how an object reacts to a force or forces, it is important to understand the different types of forces that may act on the object.