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14-force and motion 1

# 14-force and motion 1 - PHYS 211 Force and Motion...

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Unformatted text preview: PHYS 211 2/16/09 Force and Motion Newton’s Laws Newton’s First Law A book is lying at rest on the table. The book will remain there at rest because: 1) there is a net force, but the book has too much inertia 2) there are no forces acting on it 3) it does move, but too slowly to be seen 4) there is no net force on the book 5) there is a net force, but the book is too heavy to move Newton’s First Law You put your book on the car seat next to you while driving. When the car stops suddenly, the book slides forward off the seat. Why? 1) a net force acted on it 2) no net force acted on it 3) it remained at rest 4) it did not move, but only seemed to 5) gravity brie¡y stopped acting on it Newton’s First Law You kick a smooth fat stone out on a ¡rozen pond. The stone slides, slows down, and eventually stops. You conclude that: 1) the ¡orce pushing the stone ¡orward ¢nally stopped pushing on it 2) no net ¡orce acted on the stone 3) a net ¡orce acted on the stone all along 4) the stone simple “ran out o¡ steam” 5) the stone has a natural tendency to be at rest Force and Motion Kinematics- description of motion (disp, vel, acc) Dynamics- study cause of motion Isaac Newton (1642-1727) - still use his ideas 3 centuries later Newton’s Laws explain a wide range of phenomena except:...
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14-force and motion 1 - PHYS 211 Force and Motion...

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