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Unformatted text preview: 5.1 Force-kinematics (of how something moves) and dynamics (cause of the motion) create mechanics (the general science of motion)-a force is a push or a pull-a force acts on an object (pushes and pulls are applied to something-an object)-a force requires an agent (something that acts or exerts power)-a force is a vector-a force can be either a contact fore or a long-range force.-in the particle model, objects cannot exert forces on themselves-we find that when several forces F(1),F(2), f(3)... are exerted on an object, they combine to form a net force given by the vecotr sum of all the forces: F(net)=(the equal sign actual has three lines) Sigma^(n)(i=1)=F(1)+F(2)....-recal that the equal sign with three bars is the symbol meaning "is defined as"-mathematically, this summation is called a superposition of forces, the net force is sometimes called the resultant force. 5.2 A Short Catalog of Forces-the gravitation pull of a planet on an object on or near the surface is called the gravitational force...
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