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# lecture6 - Newtons Laws of Motion Newtons Laws Forces Mass...

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Physics 1D03 - Lecture 6 1 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

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Physics 1D03 - Lecture 6 2 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. (This law was actually due to Galileo.) Objects in equilibrium (no net external force) also move at constant velocity.
Physics 1D03 - Lecture 6 3 Forces A force is a push or pull that tends to cause motion (more exactly, changes in motion) From the Second Law, force should have units of Force is a vector. In Newton’s dynamics, all influences on a particle from its surroundings are expressed as forces exerted on that particle. (N) newton 1 m/s kg 1 2 =

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4 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
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lecture6 - Newtons Laws of Motion Newtons Laws Forces Mass...

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