Lecture_2

# Lecture_2 - PHYS 220 General Physics Galileo There were...

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PHYS 220 General Physics

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Galileo There were problems with Aristotle's ideas (e.g. any item that coasts to a stop) Galileo Experimented with balls on an inclined plane Conclusion: If the slope is 0, the acceleration should be 0.
Inertia An object will maintain its state of motion (its velocity) unless it is acted upon by a force. Does not yet explain how force is related to motion – Newton's laws will do this. Breaks Aristotle's link between force and velocity.

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Newton's Laws of Motion 3 Laws describe how things move: #1 Restate the principle of inertia #2 Links force with motion (specifically acceleration) #3 Explains where forces come from
If the total force acting on an object is zero, the object will maintain its velocity (magnitude and direction) forever. Inertia is a measure of an object's resistance to change in motion – depends on mass. Mass is a measure of how much matter an

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## This note was uploaded on 12/07/2011 for the course PHYS 220 taught by Professor Chang during the Fall '09 term at Purdue.

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Lecture_2 - PHYS 220 General Physics Galileo There were...

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