lecture-ch5 - Contents 5 Newton’s Laws of Motion 1 5.1...

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Unformatted text preview: Contents 5 Newton’s Laws of Motion 1 5.1 Newtonian Mechanics . . . . . . . . . . . . . . . . . . . . . . . 1 5.2 Newton’s First Law . . . . . . . . . . . . . . . . . . . . . . . . 2 5.3 Force . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 5.3.1 Inertial Reference Frames . . . . . . . . . . . . . . . . 2 5.4 Mass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 5.5 Newton’s Second Law . . . . . . . . . . . . . . . . . . . . . . . 3 5.6 Newton’s Third Law . . . . . . . . . . . . . . . . . . . . . . . 3 5.7 Some Particular Forces . . . . . . . . . . . . . . . . . . . . . . 5 5.7.1 The Gravitational Force . . . . . . . . . . . . . . . . . 5 5.7.2 Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5.7.3 The Normal Force . . . . . . . . . . . . . . . . . . . . 6 5.7.4 Friction . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5.7.5 Tension . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5.8 Sample Problems . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.8.1 ( i ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.8.2 ( ii ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5.8.3 ( iii ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 5 Newton’s Laws of Motion Physics is a study of what can cause an object to accelerate. That cause is a force , which is loosely speaking, a push or pull on the object. 5.1 Newtonian Mechanics The relation between a force and the acceleration it causes was first under- stood by Isaac Newton (1642-1727). The study of that relation, as Newton presented, is called Newtonian Mechanics. Newtonian mechanics does not apply to all situations. If the speed of the interacting bodies are very large—an appreciable fraction of the speed of light—we must replace Newtonian mechanics with Einstein’s special theory of relativity, which holds at any speed, including those near the speed of light. If the interacting bodies are on the scale of atomic structure, we must 1 replace Newtonian mechanics with quantum mechanics. Physicists now view Newtonian mechanics as a special case of these two comprehensive theories. 5.2 Newton’s First Law Proposition 1 Newton’s First Law: If no force acts on a body, the body’s velocity cannot change; that is, the body cannot accelerate....
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This note was uploaded on 05/14/2011 for the course ECON 101 taught by Professor Asdaf during the Spring '11 term at Universidad de San Buenaventura Bogota.

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lecture-ch5 - Contents 5 Newton’s Laws of Motion 1 5.1...

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