2. Do Now: 1. How much would you weigh on Jupiter if the acceleration due to gravity there is 25.1 m/s 2 ? 2. Are mass and weight the same thing? Describe their similarities and/or differences.

3. Do Now (11/21): 1. Draw a force diagram for the following: A. A soccer ball rolling on the ground at constant speed. B. A skateboarder accelerating. C. An apple falling off a tree. 2. For each of the previous questions, label the diagrams as balanced or unbalanced.

4. 10/24/10 Drawing Force Diagrams

5. Applied Force F ap A push or a pull on an object Acts in the direction of the push or pull

6. Drawing Force Diagrams Identify forces with force vectors Force vectors should come OUT of an object FNFN FgFg

7. Review: Net force – the sum of all forces acting on an object

8. Balanced Forces Net force = 0 Acceleration = 0 No resulting motion or constant straight line motion Examples: a stapler sitting on a desk, a car traveling in a straight line 60 mph, etc.

10. Unbalanced Forces Net force = nonzero Acceleration = nonzero Changing speed and/or direction Examples: a car speeding up to merge on a highway, a penny dropped from a building, etc.

11. Calculating net force Add up the sum of the forces in the x and y directions forces in the same direction add their magnitudes: Forces in opposite directions subtract, with the sign the same as the larger force:

12. Calculating net force Add up the sum of the forces in the x and y directions forces in the same direction add their magnitudes: Forces in opposite directions subtract, with the sign the same as the larger force:

13. Practice: Use the rest of class to work on Force Diagrams. It is due at the end of class. * #1: constant speed #3: m = 2 kg #5: m = 142 kg

14. Directions: At each station, you will have a task. Follow the directions on the paper at each table. Complete one paper per group You may write on the papers or you may use your own You will have 3 MINUTES at each station – use your time wisely. Take your work with you as you go. Make sure your group’s name is on your work.

15. 04 595857565554535251504948474645444342414039383736353433323130292827262524232221201918171615141312111009080706050403020100 Countdown Clock By Dr. Jeff Ertzberger Back to Clock Home

16. Do Now (11/21): Draw examples of the two types of combination circuits you will be expected to solve on tomorrow’s quiz

17. Quiz Review: Please work on the sheet “Quiz Review: Simple Combination Circuits.” It is due tomorrow.