FOUR COURSES · ONE TOPIC EACH · VERO BEACH, FLORIDA
Today, in four courses
Every course posts one topic a day: the idea, something to play with, and a set of Cornell Notes. Notes are free to read and always will be.
Conceptual Physics
Newton’s Third Law · Hewitt Ch. 5 · Math-free
You cannot push without being pushed back
A force is never something an object has. It is something two objects do to each other, which is why the horse and the cart both move.
Physics & Engineering Research
Plots, Slices and Fits · Practice 2
Getting an acceleration out of a fit
A straight-line fit will fit a curve without complaining. The fit is not the answer. The fit plus a reason to believe it is the answer.
AP Physics 1&2
Unit 2, Force and Translational Dynamics · AP 1 and AP 2
Circular motion
Going round at a steady speed is accelerating the whole way, toward the center. No new force appears. The old ones are asked to point inward.
AP Physics C
Unit 2, Force and Translational Dynamics · Mechanics and E&M
Circular motion
Steady speed, and accelerating the whole way. No new force appears in this topic. The old ones are simply asked to point inward.
Every question, with Socrates
The whole practice quiz, one card per question. Wrong answers cost nothing, and there is no attempt limit.
Open the practice quizThe whole quiz is for students in the class. Sign in with your class code to open it.
Slopes, Areas, and Reference Frames
Three levels on today’s AP topic. The trap on level two catches almost everyone the first time.
Solutions tomorrow at 7:00 AM Eastern. Wrong answers cost nothing, and there is no attempt limit.