Park Physics with Sean Lally - 2017-2018

For next class, try to explain the pom-pom demonstration. Also, have a look at this chart and note anything interesting. http://electron6.phys.utk.edu/phys250/modules/module%206/images/particle_chart.jpg

Lex. III. Actioni contrariam semper & aequalem esse reactionent: sive corporum duorum actiones in se mutuo semper esse aequales & in partes contrarias dirigi. To every action there is always opposed an equal reaction; or the mutual actions of two bodies upon each other are always equal, and directed to contrary parts. Whatever draws or presses another is as much drawn or pressed by that other. If you press a stone with your finger, the finger is also pressed by the stone. If a horse draws a stone tied to a rope, the horse (if I  may so say) will be equally drawn back towards the stone: for the distended rope, by the same endeavour to relax or unbend itself, will draw the horse as much towards the stone as it does the stone towards the horse, and will obstruct the progress of the one as much as it advances that of the other. And now, in more contemporary language: 3.  Newton's Third Law To every action, there is opposed an equal reactio...

Isaac Newton, 1642-1727   Principia Mathematica,  1687 Newton,  Philosophiae naturalis principia mathematica  (1687) Translated by Andrew Motte (1729) Lex. II. Mutationem motus proportionalem esse vi motrici impressae, & fieri secundum lineam rectam qua vis illa imprimitur. The alteration of motion is ever proportional to the motive force impressed; and is made in the direction of the right line in which that force is impressed. If any force generates a motion, a double force will generate double the motion, a triple force triple the motion, whether that force be impressed altogether and at once, or gradually and successively. And this motion (being always directed the same way with the generating force), if the body moved before, is added to or subtracted from the former motion, according as they directly conspire with or are directly contrary to each other; or obliquely joined, when they are oblique, so as to produce a new motion co...

Newton,  Philosophiae naturalis principia mathematica  (1687) Translated by Andrew Motte (1729) Lex. I. Corpus omne perseverare in statu suo quiescendi vel movendi uniformiter in directum, nisi quatenus a viribus impressis cogitur statum illum mutare. Every body perseveres in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed thereon. Projectiles persevere in their motions, so far as they are not retarded by the resistance of the air, or impelled downwards by the force of gravity. A top, whose parts by their cohesion are perpetually drawn aside from rectilinear motions, does not cease its rotation, otherwise than as it is retarded by the air. The greater bodies of the planets and comets, meeting with less resistance in more free spaces, preserve their motions both progressive and circular for a much longer time. And now, in more contemporary language: 1.  Newton's First Law (inertia) An ob...

Hi everyone! This is a reminder to look at your "data" from the lab - separate things into A, B, and C and determine what types of trends you are seeing.  Ultimately, you will be trying to infer the laws of mechanics. Also in class on Friday, I will distribute the Car/Vehicle guidelines.  Bring a drawing/plan to class, if you have one. One other thing - by popular request, I will likely be relocating my class information to Veracross (instead of this blog).  I've used the blog as it has a mobile interface and is more convenient for me.  However, some students are apparently finding it problematic and I'd like to fix that. Thanks! sean