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Unformatted text preview: Read the summary pages after each chapter. This is my summary of the summary pages at the end of each chapter. Chapter 4 Force and Newtons Laws of Motion o A force is a push or a pull. It is a vector quantity and has units of Newton: 1 N 1 kg m/s 2 . o The net force on a system is the vector sum of all the forces acting on it. o Newtons 1 st Law: If zero net force acts on an object, the objects velocity does NOT change. If there is a net force, there is acceleration, so the velocity (speed or direction) must change. o Newtons 2 nd Law: The net force acting on an object is related to the objects acceleration through its mass: F a m = r r or F ma = r r o Many problems can be solved by treating the x and y components separately. o Drawing a free body diagram involves drawing vector arrows representing every force acting on a chosen object. o The magnitude of the gravitational force between two objects is 1 2 2 Gm m F r = where r is the distance between the objects centers. Each object is always pulled toward the others center o Weight is defined to be the magnitude of the gravitational force acting on an object: W mg = . Weight is proportional to mass. o A normal force (usually denoted by N ) is a contact force perpendicular to a surface that pushes each object away from the other....
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This note was uploaded on 12/23/2011 for the course PHY 2130 taught by Professor Rehse during the Fall '08 term at Wayne State University.
 Fall '08
 REHSE
 Force

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