1. Forces and Newton’s Laws

2. Galileo 1st to state that forces are not necessary to keep things moving In the absence of friction, things will continue to move if already moving and stay at rest if already at rest Every material has a resistance to a change in its state of motion - INERTIA

3. An inertia example

4. Newton’s 1st law. (The law of Inertia) Every body continues in its state of rest, or of constant motion in a straight line at a constant speed, unless it is compelled to change that state by an unbalanced FORCE

5. Demonstrations I HOOP IT WORKS? HOW’S IT HANGING?

6. Question. Would it be correct to say that the reason an object resists change, and persists in its state of motion is because of inertia?

7. Bad Inertia Jumping to Breinigsville Helicoptering to California

8. Inertia example

9. A painful inertia example

11. Fact If an astronaut is in space for any extended period of time, it is extremely important that He or She does not lose mass. How can an astronaut measure his or her mass while in a “weightless” environment?

12. An objects inertia is measured by its MASS

13. Mass VS Weight Mass Amount of matter in an object Does not depend on location Weight The gravitational force that acts on an object Depends on location Mass and weight are not the same, but are proportional to each other in any one location

14. …unless it is compelled to change that state by an UNBALANCED FORCE