2. Main Idea: What is a Force What is a Force? How do Forces Combine? FORCES ACTING IN THE SAME DIRECTION FORCES ACTING THE OPPOSITE DIRECTION What Happens to an Object When Forces Are Balanced? What Happens to an Object When Forces are Not Balanced? MOVING OBJECTS NONMOVING OBJECTS DIRECTION OF MOVEMENT Your Completed outline should look like this.

3. Really Reading Notes Volunteer Read, pg 169 –“Before You Read” –These are the questions you should be able to answer by the time we finish reading Volunteer Read, pg 169 –First paragraph of “What is a Force” –What would you underline & why –Nothing This is to get you thinking about how you have heard the word “force” used before

4. Really Reading Notes Volunteer Read, pg 169 –Second paragraph of “What is a Force” –What would you underline? We’re only asking the question Do NOT underline anything YET –I would underline force is a push or a pull direction magnitude newton unit

5. Really Reading Notes Volunteer Read –Third paragraph of “What is a Force” pg 169 –What would you underline? We’re only asking the question Do NOT underline anything YET –I would underline act on objects around us can see

6. Really Reading Notes Volunteer Read –Fourth paragraph of “What is a Force” pg 169 –What would you underline? –I would underline can not see

7. Really Reading Notes Volunteer Read –Fifth paragraph of “What is a Force” pg 169 –What would you underline? –I would underline when the forces are balanced object does not move

8. Really Reading Notes Skip 1 line on your sheet of paper Mark 3 columns on your paper Title the first “What I already know” Title the second “Interesting Facts” Title the third “What I still don’t Understand”

9. What Happens to an Object When Forces are Not Balanced? MOVING OBJECTS NONMOVING OBJECTS DIRECTION OF MOVEMENT What I Already Know Interesting Facts What I Still Don’t Understand

10. Really Reading Notes How would you use the words you have underlined on page 169 to make statements about what you have read? I would write: –Force is a push or pull with direction and magnitude –Has units of Newtons –Act on objects around us in ways that we can and can not see –When the forces are balanced the object does not move

11. Really Reading Notes How would you classify the 1 st statement? –Force is a push or pull with direction and magnitude “Already Knew” column? “Interesting Fact” column? “Still don’t understand” column?

12. Really Reading Notes How would you classify the 2 nd statement? –Has units of Newtons “Already Knew” column? “Interesting Fact” column? “Still don’t understand” column?

13. Really Reading Notes Do your columns need to have an equal number of statements? –No Which 2 columns will probably have more? –“Already Know” –“Interesting Facts” “Still Don’t Understand” may only have 1 or 2 statements for the whole reading assignment

14. Really Reading Notes How would you classify the 3 rd statement? –Act on objects around us in ways that we can and can not see “Already Knew” column? “Interesting Fact” column? “Still don’t understand” column?

15. Really Reading Notes How would you classify the 4 th statement? –When the forces are balanced the object does not move “Already Knew” column? “Interesting Fact” column? “Still don’t understand” column?

16. Really Reading Notes From the section ”What is a Force” Are there any things that you “Still Don’t Understand” ? If there are –Write the statement in this column –I’ll be able to answer the question & help you learn

17. Really Reading Notes Turn to page 170 Volunteer Read – “How Do Forces Combine” –Underline more than one force acts on an object result is combined effect net force

18. Really Reading Notes How would you use the words you have underlined in this section to make statements about what you have read? more than one force acts on an object result is combined effect net force I would write these as: –A net force is when more than one force acts on an object –The result is a combined effect

19. Really Reading Notes How would you classify these statements? –A net force is when more than one force acts on an object –The result is a combined effect “Already Knew” column? “Interesting Fact” column? “Still don’t understand” column?

20. Really Reading Notes Those who have already demonstrated you can make RRN –Have the choice of working independently –Or continuing to work with the group to help you understand what to do Group by tables if you want to If you finish early –Do the margin questions for extra credit –Do the questions on page 173 for extra credit

21. Really Reading Notes Volunteer Read – “Forces Acting in the Same Direction” pg 170 –Underline forces in the same direction add Work as a table group –Use the words you have underlined to make statements about what you have read –I would write: Forces going in the same direction always add

22. Really Reading Notes How would you classify this statement? Forces going in the same direction always add “Already Knew” column? “Interesting Fact” column? “Still don’t understand” column?

23. Really Reading Notes Volunteer Read – “Forces Acting in the Opposite Directions” pg 170 –Underline forces in opposite directions subtract direction net force same as the larger force Work as a table group –Use the words you have underlined to make statements about what you have read

24. Really Reading Notes How would you classify your statements? –Forces going in opposite directions always subtract –Net force direction is the same as the larger force “Already Knew” column? “Interesting Fact” column? “Still don’t understand” column?

25. Really Reading Notes From the section ”How Do Forces Combine” Are there any things that you “Still Don’t Understand” ? If there are –Write the statement in this column –I’ll be able to answer the question & help you learn

26. Really Reading Notes Volunteer Read – “What Happens to an Object When Forces Are Balanced?” pg 171 –Underline not moving static balanced forces act on static object balanced no change in motion net force is 0N tension force pulled or stretched compression force pushed or squeezed

27. Really Reading Notes Work with your shoulder partner –Use the words you have underlined to make statements about what you have read Then write the statements in the correct column on your RRN paper

28. Really Reading Notes For your homework –Complete your RRN for to the end of page 172 –Due on Friday, 1/15/10 For extra credit –Do the Margin Questions –Answer the questions on page 173