Hewitt Drew-It! PHYSICS Screencasts
Newton's Third Law and Newton's Laws Problems

21. Newton's Third Law
Paul and wife Lil illustrate that one cannot touch without being touched with supporting examples.

22. Newton's Laws Problem
Paul covers some good physics with an explanation of the classic 2-mass-pulley problem.

23. Nellie in an Elevator
Paul investigates the forces that act on Nellie Newton in an elevator.