20_Galileo_theories - Lesson 20 Galileo's Force Theories...

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Lesson 20: Galileo's Force Theories Over time questions started to be asked about why objects moved. Just describing the motion ( kinematics ) wasn't good enough. The study of dynamics , an analysis of the forces acting on an object, was born. By putting these two ideas together, you get a complete explanation of the motion of objects, a branch of physics known as mechanics. kinematics + dynamics = mechanics Greeks (like Aristotle) had noticed 2300 years ago that to keep something moving you had to keep pushing on it (a force). If you stopped pushing, it stopped moving. From this they came up with the idea that the natural state of any object is to be at rest (not moving). They believed a constant force results in a constant velocity. From our everyday experience this seems to be true… but is it? Galileo’s Work Galileo imagined a world where there was no friction . He believed friction complicated his study of dynamics, and by ignoring it he could simplify his theories.
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