Book on a Table + Block on String

This activity is adapted from "Unit 1: Normal Forces" in the book "Preconceptions in Mechanics" by Camp and Clement: https://people.umass.edu/clement/pdf/PreconceptionsManuscriptEd.pdf Video demo of stretching a wire taken from: https://www.youtube.com/watch?v=XS-lVAyvySk

By Frank Noschese