Lec8 - Lecture 8 P112 Feb 6 2008 Agenda for today • Forces – Fundamental Forces of Nature – What is a Force – How does it affect motion –

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Unformatted text preview: Lecture 8 P112 Feb 6, 2008 Agenda for today • Forces – Fundamental Forces of Nature – What is a Force – How does it affect motion – Newton’s first and second laws Fundamental Forces • Gravitational • Weak – Governs radioactive decays, elementary particle transformations • Electromagnetic – Electric charge interactions • Strong – binds protons and neutrons in the nucleus Unification? 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,… 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 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 Experiments show that the effect is the same: apply two forces = apply a force that corresponds to the vector sum of the two!...
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This note was uploaded on 04/16/2009 for the course PHYS 1112 taught by Professor Leclair,a during the Fall '07 term at Cornell University (Engineering School).

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Lec8 - Lecture 8 P112 Feb 6 2008 Agenda for today • Forces – Fundamental Forces of Nature – What is a Force – How does it affect motion –

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