1. Back in the saddle folks…
Ch. 12 Notes Day 1
Back in the saddle folks…

2. Objectives SWBAT create a mini-lesson on a given section in the text
SWBAT to relate real-life examples of forces to the information in the book

3. Requirements
Make a group with no more than 4 students. Read the assigned section, and be ready to present to the class tomorrow and Monday.
Pick the person with the BEST handwriting and the person who is the BEST artist. They will be the scribes for your group.
You will work together to teach the class about your section.

4. More Requirements
Define all BOLD definitions provided in your section and include in your notes that you will present to the class
Include all Key Concepts in your notes to present to the class
Explain what your section means to you. After you explain, ask the class to come up with examples of your section.
Choose the most relevant example and draw it in your notes that you present to the class.

5. Ch. 12 Notes Day 2

6. Group Presentations
Groups will present on their assigned topics from Ch

7. Newton’s 3 Laws of Motion
Ch. 12 Notes Day 3
Newton’s 3 Laws of Motion

8. Review Newton’s First Law of Motion
An object at rest will stay at rest, and an object in motion will stay in motion at constant speed, unless acted upon by an external (unbalanced) force.
Inertia: the resistance an object has to a change in its state of motion.
Objects keep on doing
what they’re doing…

9. Newton’s Second Law of Motion
(Law of Acceleration)
F=ma

10. Newton’s 2nd Law (Law of Acceleration) F=m x a
Force = mass x acceleration
An Unbalanced Force acting on an object causes it to Accelerate

11. F=ma Rules Force- you must have (N) for your answer
mass- you must have (kg) for your answer
acceleration- you must have m/s^2 for your answer
Points will be taken off if you forget.

12. 2nd Law
F=ma is the net force of an object equal to the product of its mass and acceleration.
Example:
A little boy pushes a wagon with his dog in it. The mass of the dog and wagon together is 45kg. The wagon accelerates at 0.85 m/s2. What force is the boy pulling with?
F=(45kg)(0.85 m/s2)
What is the Force?? N

13. Newton’s Third Law of Motion
(Action and Reaction)

14. Newton’s Third Law of Motion
For every action force there is a reaction force equal in strength and opposite in direction.
third%20law.swf

15. Ch. 12 Notes Day 4

16. Momentum and Newton’s 3rd Law
Momentum- a measure of how hard it is to STOP something that is moving
Momentum (M) = mass (kg) x velocity (m/s)
**MOMENTUM IS ALWAYS CONSERVED

17. Normal Force
The fancy name for the force that acts PERPENDICULAR to an object
Normal force from a table
Normal force from a wall

19. Centripetal Force
Centripetal Force – the force that keeps objects moving in a circle.
Ex. Could be friction from the wheels of a car, the tension in a string, the normal force from a wall holding you in place