chapter4 - Chapter 4 Forces and Mass Classical Mechanics...

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Chapter 4 Chapter 4 Forces and Mass
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Classical Mechanics Classical Mechanics does not apply for very tiny objects (< atomic sizes) objects moving near the speed of light
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Newton’s First Law Newton’s First Law If the net force  F exerted on an object is zero the  object continues in its original state of motion. That  is, if  F = 0, an object at rest remains at rest and an  object moving with some velocity continues with the  same velocity. Contrast with Aristotle!
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Forces Forces Usually a push or pull Vector Either contact or field force
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Contact and Field Forces Contact and Field Forces
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Fundamental (Field) Forces Fundamental (Field) Forces Types Strong nuclear force Electromagnetic force Weak nuclear force Gravity
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Strong Nuclear Force Strong Nuclear Force QCD (Quantum chromodynamics) confines quarks by exchaning gluons Nuclear force: binds protons and neutrons by exchanging pions
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Electromagnetic Forces Electromagnetic Forces  Opposites attract, like-signs repel  Electric forces bind electrons in atoms  Magnetic forces arise from moving charges
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Weak Nuclear Force Weak Nuclear Force Involves exchange of heavy W or Z particle Responsible for decay of neutrons
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Gravity Gravity Attractive force between any two bodies Proportional to both masses Inversely proportional to square of distance F =G m 1 2 r 2
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Inertia (Newton’s First Law) Inertia (Newton’s First Law) Tendency of an object to continue in its original  motion
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Mass Mass A measure of the resistance of an object to changes in  its motion due to a force Scalar SI units are kg
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Newton’s Second Law Newton’s Second Law Acceleration is proportional to net force and inversely  proportional to mass. r F е =m R a
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Units of Force Units of Force SI unit is Newton (N) US Customary unit is pound (lb) 1 N = 0.225 lb F =ma 1 N = 1 kg Ч m s 2
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Weight Weight Weight is magnitude of gravitational force  w =mg w=G M earth m r 2 g= GM R 2 weight mass
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Weight vs. Mass Weight vs. Mass Mass is inherent property Weight depends on location
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Newton’s Third Law Newton’s Third Law Single isolated force cannot exist For every action there is an equal and opposite  reaction Force on “1” due to “2” r F 12 =- R F 21
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Newton’s Third Law cont.
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This note was uploaded on 07/25/2008 for the course PHY 231C taught by Professor Pratt during the Spring '06 term at Michigan State University.

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chapter4 - Chapter 4 Forces and Mass Classical Mechanics...

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