lec06 - Lecture 6 Newtons Laws and Keplers Laws Lecture 6...

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Lecture 6 Newton’s Laws and Kepler’s Laws Lecture 6 Purdue University, Astronomy 364 1
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Newton 1 st Law • An object remains at rest or moves at a constant velocity unless a net force acts upon it. – Concept of inertia – Concept of inertial frames of reference Lecture 6 Purdue University, Astronomy 364 2 No fundamental difference between “at rest” and “motion at a constant velocity”!
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Newton’s 2 nd Law • If a net force acts on an object, it accelerates in the direction of the net force, with the magnitude of the acceleration proportional to the magnitude of the net force and inversely proportional to the mass of the object. – It holds only in inertial frames of reference. Lecture 6 Purdue University, Astronomy 364 3 F = m a Mass is a measure of inertia.
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rd Law • Every action has an equal and opposite reaction. – When you hit me, I hit you back equally hard! Lecture 6
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lec06 - Lecture 6 Newtons Laws and Keplers Laws Lecture 6...

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