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# lecture6 - Newtons First Law(Law of Inertia Newtons Laws of...

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1 Physics 1D03 - Lecture 6 Newton’s Laws of Motion Newton’s Laws • Forces Mass and Weight Serway and Jewett 5.1 to 5.6 Practice: Chapter 5, Objective Questions 1, 8 problems 1, 3, 10, 11, 14 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 believed 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. 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 of an object’s inertia .

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lecture6 - Newtons First Law(Law of Inertia Newtons Laws of...

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