# lecture6 - 1 Physics 1D03 Lecture 6 Newton’s Laws of...

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Unformatted text preview: 1 Physics 1D03 - Lecture 6 Newton’s Laws of Motion Newton’s Laws of Motion • Newton’s Laws • Forces • Mass and Weight Serway and Jewett 5.1 to 5.6 Practice: Chapter 5, questions 1, 4, 7, 9 problems 1, 3, 10, 11 Physics 1D03 - Lecture 6 Newton’s First Law (Law of Inertia ) An isolated object, free from external forces, will continue moving at constant velocity, or remain at rest. Earlier, Aristotle said objects were “naturally” at rest, and needed a continuing push to keep moving. Galileo realised that motion at constant velocity is “natural”, and only changes in velocity require external causes. (actually due to Galileo.) Objects in equilibrium (no net external force) also move at constant velocity. 2 Physics 1D03 - Lecture 6 Newton’s Second Law F net (or F total ) is the vector sum of all forces acting on the particle of mass m. The acceleration a is parallel to the total force, and proportional to it. The proportionality constant is the particle’s mass . Newton defines mass as a measure ....
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## This note was uploaded on 01/13/2011 for the course PHYSICS PHYSICS 1D taught by Professor Mckay during the Fall '09 term at McMaster University.

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lecture6 - 1 Physics 1D03 Lecture 6 Newton’s Laws of...

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