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_lec8_ppt_ - Lecture 8 P112 Feb 7 2007 Labs First lab...

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Lecture 8 P112 Feb 7, 2007
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Labs ± First lab begins this week ± No prelab ± You must finish lab in class (No problem) No homework ± You must be registered for the lab you attend ± No scheduled makeup labs With instructor permission you may attend another lab section the week it is offered -- subject to space -- you should have a good excuse ± Missing lab = loose 1 grade (ex: B+ to B)
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Agenda for today ± Forces ± Fundamental Forces of Nature ± What is a Force ± How does it affect motion ± Newton ± s first and second laws
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Fundamental Forces ± Gravitational ± Weak ± Governs radioactive decays, elementary particle transformations ± Electromagnetic ± Electric charge interactions ± Strong ± binds protons and neutrons in the nucleus Unification?
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In P112 we deal with the macroscopic manifestations.. ± Non-contact forces: ± Gravity, magnetism (“field forces”) ± All others are “contact forces” ± Macroscopic effects of the micro-scale electromagnetic forces between molecules and atoms ± Solids: tension, compression, springs, normal, friction ± Fluids: pressure, buoyancy, drag,…
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What ± s a force? ± Description of an interaction between two bodies or a body and its environment (a “push” or a “pull”) ± Force is a vector ± Unit: Newton (N) 1N is the amount of force that gives an acceleration of 1m/s 2 to a body with a mass of 1kg
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Forces involve two objects ± Bob pushes on a crate (3) Body on which the force acts (4) Body providing the force (subscript) F Bob on crate F Bc
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