1. The Science of NFL Football

2. Newton’s 1st Law of Motion - Inertia
Why do objects sometimes not move?
Why do objects sometimes move with constant velocity?
Why do object sometimes accelerate?

3. Newton’s First Law - Inertia
An object will remain at rest or in motion with a constant velocity unless acted on by an external net force.
Fine Points
Two natural states of “motion”
At Rest OR Constant Velocity
External, Net Force results in other motion
Acceleration
Relate relationship of inertia to mass – give examples: harder to push truck than small car. Football linemen, etc.
Tell story of stewardess caution, “Do not jump up when in flight. The back of the plane will come up to hit you.”
Examples of using 1st law in our everyday lives:
stomping feet to get snow or dirt off
driving in car and cup slides off dash or papers slide of seat when brake
shaking dust off coat

4. Underlying Concepts of Inertia
Do objects have inertia because of mass, weight, friction?
Mass - quantity of matter in an object measured by its resistance to a change in its motion (inertia)
Do objects have inertia because of mass, weight, friction? They have inertia due to their mass.

5. Mass vs Weight
Which one changes when you change elevation on the earth…or go to the Moon? Why?
Is your weight constant on earth?
How do you convert back and forth between the two?
If you pushed/lifted a mass on earth then on the moon, what would be the same? What would be different?

6. Newton’s 1st Law and Everyday Experience
Use Newton’s 1st Law to explain the how and why of…
getting snow out of the crevices of your boots?
why many automobile passengers experience neck injuries when struck by a car from behind?
what happens to the books on the passenger seat of your car when you slam on your breaks?
getting raindrops off an umbrella before coming indoors?
the best way to escape from a rampaging elephant?
how to tighten a loose hammer head?
Students are expected to have notes on the definition of Newton’s 1st Law