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Unformatted text preview: Chapter Four: The Laws of Motion I) Force: push or pull on some object A) Vector quantity: can control magnitude and direction of an applied force B) Types of forces 1) Contact forces: result from physical contact b/t two objects 2) Field forces: an object of mass creates an invisible influence that stretches throughout space and a second object of mass interacts with the field of the first object a) Ex: electric force that one electric charge exerts on another b) Field forces in order of decreasing strength: i) Strong nuclear force b/t subatomic particles ii) Electromagnetic forces b/t electric charges iii) Weak nuclear force that arises in certain radioactive decay processes iv) Gravitational force b/t objects C) Can chance the shape of an object II) Newton’s first law of motion: An object moves with a velocity that is constant in magnitude and direction, unless acted on by a nonzero net force A) Net force of an object is the vector sum of all external forces acting on the object B) Inertia: tendency of an object to continue in its original state of motion C) Mass: measure of an object’s resistance to changes in its motion due to a force...
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This note was uploaded on 04/02/2008 for the course PHY 231 taught by Professor Smith during the Fall '08 term at Michigan State University.
- Fall '08