Sprint 40 · Chapter 4

Newton's First Law: No Net Force, No Acceleration

Use the first law in both directions: from forces to motion, and from observed motion back to the forces.

1. 1Using the First Law Both Ways
2. 2The Jerk in a City Bus
3. 3Why You Lurch in a Bus
4. 4The Astronaut Who Drifted Off
5. 5Exercise 4.1: Net Force Is…?
6. 6Thrown Forward in the Bus