1. Forces as Interactions
Warm Up 11/30
Forces as Interactions
Title Date Page

2. Exploring Forces as Interactions
Gravity Clip

3. Find an example of how a force changed the astronauts motion.

4. Newton’s Law Notes 11/30 Title Date Page

5. Notes: Newton’s Laws What are Newton’s 3rd Law? 1st Law?
How does the clip portray Newton’s 3rd Law? Newton’s 1st Law?
Gravity
Wall-E 3rd Law: Every action force has an equal and opposite reaction force 1st Law: An object in motion stays in motion

7. Newton’s 1st law An object at rest stays at rest
An object in motion stays in motion
…..Unless acted upon by an unbalanced force
Objects tend to keep doing what they are doing!
So we are addressing two things: the behavior of an object at rest and the behavior of an object in motion
Coffee in a car is a perfect example of Newton’s 1st law: When are the times the coffee is most likely to spill? 1. When the car begins moving (from rest), when the car changes direction, and when the car stops.
Seat belts also make sense to talk about here.

8. Newton’s 2nd law
When forces are not balanced, how much an object accelerates depends on 2 things:
The NET Force acting on the object
The MASS of the object
Net Force= mass * acceleration
F = m * a
Objects at equillibrium (forces balanced) will not accelerate (1st law – they keep doing what they are doing).
Second law deals with objects that do not have balanced forces.
NET FORCE = sum of the forces (draw this out)

12. Let’s practice…
Determine the acceleration that results when a 12 N net force is applied to a 3 kg object.
Write your own F = m x a word problem

13. 3rd Law Pairs

14. Forces as Interactions Exploring Newton’s Laws Gravity Clip

15. How did this scene demonstrate Newton’s 1st Law
How did this scene demonstrate Newton’s 1st Law? Inertia – an object in motion stays in motion…

16. How is releasing the gas from the extinguisher an example of equal and opposite forces? (3rd law action – reaction)

17. Newton’s 2nd law F=ma How would the motion been different for a more massive astronaut?

18. What direction was she being pushed
What direction was she being pushed? What direction was the gas being pushed?

19. Newton’s 3rd law Equal Opposite Forces Why did throwing the extinguisher allow her to change direction?