Physics 321 Hour 1 Course Introduction. Course Components Course Outline Prerequisites: ODEs, Mathematica Reading: Due before lecture HW: Due MWF - see.

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Presentation transcript:

Physics 321 Hour 1 Course Introduction

Course Components Course Outline Prerequisites: ODEs, Mathematica Reading: Due before lecture HW: Due MWF - see schedule on Learning Suite HWLearning Suite Take-home Tests: Due every other Thursday Take-home Tests Midterm Exams: In the Testing Center Final Exam: In Class

Course Components Reading: 5% Homework: 10% Take-home Tests: 40% Midterms: 25% Final: 20%

HW & Take- home Tests

Physics 321 Hour 1 Newton’s Laws of Motion

Before Newton What is the natural motion of an object? Greeks – without force, motion stops Kepler – straight lines (earth→heavens) Galileo – circles (heavens →earth) Descartes – matter and motion are conserved

Before Newton How do we understand collisions? Descartes – conservation of motion Huygens – motion = mass x velocity Leibniz – vis viva = mass x velocity 2

Newton’s 0 th Law The quantity of motion is the measure of the same, arising from the velocity and quantity of matter conjointly. = Huygen’s definition of motion

Newton’s 1 st Law Every body continues in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed upon it. = Descartes’ idea of natural motion

Newton’s 2 nd Law The change of motion is proportional to the motive force impressed, and is made in the direction of the right line in which that force acts. = A way to measure/define force

Newton’s 3 rd Law To every action there is always an equal reaction; or, the mutual actions of two bodies upon each other are always equal, and directed to contrary parts. Forces are binary Momentum is conserved instant by instant Forces add as vectors

Newton’s Laws and Measurement What do we have to measure to verify/apply Newton’s laws of motion? What is mass, space, time? How have our ideas of mass, space and time changed since 1687?

Do Newton’s Laws Work? How could we tell if forces are really are binary? Are they binary? Two examples: charges and a bat, Lorentz force What would be necessary for forces to be conserved instant by instant?