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Study guide for Exam2

# Study guide for Exam2 - Read the summary pages after each...

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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 Newton’s 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 Newton’s 1 st Law: If zero net force acts on an object, the object’s velocity does NOT change. If there is a net force, there is acceleration, so the velocity (speed or direction) must change. o Newton’s 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 other’s 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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Study guide for Exam2 - Read the summary pages after each...

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