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Unformatted text preview: 1 Physics 1D03 - Lecture 6 Newtons Laws of Motion Newtons Laws of Motion Newtons 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 Newtons 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 Newtons 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 particles mass . Newton defines mass as a measure ....
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