Once upon a time, Professors Peter Goldreich and Sterl Phinney pioneered an order-of-magnitude physics class at Caltech.
"The art of insight in science and engineering", Sanjoy Mahajan
"Street-fighting mathematics, the art of educated guessing and opportunistic problem solving", Sanjoy Mahajan
"Order-of-magnitude physics: understanding the world with dimensional analysis, educated guesswork, and white lies", Peter Goldreich, Sanjoy Mahajan, and Sterl Phinney
"Order-of-magnitude physics", Jay Maron
"The solar system", Eric Blackman
"Astropedia", Chris Impey
"The astronomical reach of fundamental physics", Adam Burrows and Jeremiah Ostriker
David Hogg, "Real-world physics: a dropped bucket"
David Hogg, "Air resistance"
Sanjoy Mahanan and David Hogg, "Introductory physics, the new scholasticism"
Sterl Phinney, Caltech
Eugene Chiang, Berkeley
Nir Shaviv, Hebrew University of Jerusalem
Helmholtz: "I have no satisfaction in formulas unless I feel their numerical magnitude."
I teach the "Solar System" and "Space, Time, and Motion" classes at AMNH.