1. Tuesday October 10, 2017 Get started on Do – Now. Time: 5 minutes
*Start a new loose piece of paper. Write down date, question, and complete on time for full points. Continue Do-Nows on SAME paper to turn in at a later date.
Get started on Do – Now. Time: 5 minutes
Write down what you think about when you hear about Sir Issac Newton or Forces.
If you finish early, share your writing with your elbow partner.
“Learn from the past, live in the now and be optimistic about the future. .” – Unknown

2. Tuesday October 10, 2017 Do-Now Announcements
Notes-Introduction to Newton’s Laws and Forces
Hand back and review tests
“Learn from the past, live in the now and be optimistic about the future. .” – Unknown

3. Mastering Physics Codes
Student Access Code: SSNAST-CLXII-BOSSY-CAVAN-COLZA-HONES
1st Period- MPRICHARDS40488
2nd Period- MPRICHARDS16010
3rd Period- MPRICHARDS16200
4th Period- MPRICHARDS46114
5th Period- MPRICHARDS29134
7th Period- MPRICHARDS21977
“It is never too late to be who you might have been.” – Unknown

4. Science Fair Projects
Only one project has to be completed per student in a science class.
If you have more than one science class choose the class you want to do a project for
This will be an individual project
Information can be found on my teacher page
Topic/Question/Hypothesis must be submitted by FRIDAY OCTOBER 13TH.
Answer the survey link on my teacher page
“It is never too late to be who you might have been.” – Unknown

5. Folders
We will start doing folder checks so make sure to keep your handouts/quizzes/tests.
“It is never too late to be who you might have been.” – Unknown

6. Lesson is brought to you by…
SP2. Obtain, evaluate, and communicate information about how forces affect the motion of objects.
Construct an explanation based on evidence using Newton’s Laws of how forces affect the acceleration of a body.
Explain and predict the motion of a body in absence of a force and when forces are applied using Newton’s 1st Law (principle of inertia).
Calculate the acceleration for an object using Newton’s 2nd Law, including situations where multiple forces act together.
Identify the pair of equal and opposite forces between two interacting bodies and relate their magnitudes and directions using Newton’s 3rd Law.

7. Learning Objectives
Recognize that forces are required to change the motion of an object.
Explain how Newton’s Second Law relates force, mass, and acceleration.
Identify and describe action and reaction forces.

8. Newton’s Laws of Motion

9. Newton's Laws of Motion
Two of the most important quantities in physics are force and acceleration.
As you have learned, acceleration is the rate at which the velocity changes with time.
© 2014 Pearson Education, Inc.

10. Force is, quite simply, a push or a pull.
Newton's Laws of Motion
Force is, quite simply, a push or a pull.
Two quantities characterize a force:
the strength, or magnitude of the force
the direction in which the force acts
© 2014 Pearson Education, Inc.

11. Newton's Laws of Motion
Objects don't start or stop moving on their own.
This observation is the essence of Newton's first law of motion:
© 2014 Pearson Education, Inc.

12. Newton's Laws of Motion
Newton's first law of motion contains the phrase "no net force." What does this mean?
The net force is the vector sum of all the individual forces acting on an object.
© 2014 Pearson Education, Inc.

13. What happens when you sit on a chair? What forces are acting on you?
Newton's Laws of Motion
What happens when you sit on a chair?
What forces are acting on you?
© 2014 Pearson Education, Inc.

14. Newton's Laws of Motion
When you sit in a chair, there are essentially two forces acting on you: the upward push of the chair and the downward pull of gravity. Since you are at rest, the two forces must cancel out. Therefore, the vector sum of the forces, or net force, acting on you is equal to zero.
© 2014 Pearson Education, Inc.

15. Newton's Laws of Motion
Our experience tells us that an object, such as a box being pushed across the floor, will stop moving if you stop pushing on it.
This occurs because of the force of friction acting between the box and the floor.
© 2014 Pearson Education, Inc.

16. What would happen if the force of friction could be eliminated?
Newton's Laws of Motion
What would happen if the force of friction could be eliminated?
(Write your answer on your paper)
© 2014 Pearson Education, Inc.

17. Newton's Laws of Motion
While friction cannot be eliminated completely, it can be greatly reduced.
The figure below shows a device known as an air track. An air track provides a cushion of air on which a cart can ride with virtually no friction.
© 2014 Pearson Education, Inc.

18. Newton's Laws of Motion
When placed at rest on a level track, the cart will remain at rest until given a push.
In accordance with Newton's first law, once the cart is in motion, it will remain in motion until acted on by a net force. In theory, if the track could be made infinitely long and perfectly frictionless, the cart would continue moving with a constant velocity forever.
© 2014 Pearson Education, Inc.

19. © 2014 Pearson Education, Inc.

20. Newton's Laws of Motion Video – Air Track Air Track
© 2014 Pearson Education, Inc.

21. Newton's first law is sometimes referred to as the law of inertia.
Newton's Laws of Motion
Newton's first law is sometimes referred to as the law of inertia.
Loosely speaking, inertia means laziness. Objects may be thought of as lazy because they don't change their motion unless forced to do so.
© 2014 Pearson Education, Inc.

22. Newton's Laws of Motion
The tendency of an object to resist any change in its motion is referred to as its inertia.
© 2014 Pearson Education, Inc.