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Watch October Sky

Read pages 663-664 in the book.  Write down in your notes all the statements with green squares in front of them on page 663. Then do problems 1-10 and #12 on page 663.  Show their work as much as possible and draw a picture for each questions showing the vectors with labels.

Here are the answers:

1. 90 km/hr

2. 110 km/hr

3. 141 km/hr @ 45 degrees

4. 5 units

5. 4 units

6. 3 units

7. 10 units each

8. 300 km/hr

9. 400 km/hr

10. 14 m/s

12. 10,000 m

read pages 660-661 in thebook.  Write down in  your notes all the statements with green squares in front of them. Then do problems 1-15 on page 661.  Show your work as much as possible.

1. 30 m/s

2. 5 m/s

3. 48 m/s

4. 60 m/s

5. 400 m/s

6. 5 km

7. 5 km/hr-s

8. 20 m/s

9. 5 m/s

10. 15 m/s

11. 30 m/s

12. 120 m/s

13. 9.8 m/s

14. 32.4 m

15. 720 m

Mythbusters Fired bullet vs. Dropped bullet

1. Return Quizzes tomorrow, no quiz tomorrow.  Notebooks will be collected.

2. Graphically finding components

3. Mathematically finding components

Problems: pg 40 1,2,3,6  pg. 41 25,26,27, 29

Vectors and scalars

1. What are they and some examples

2. Adding parallel vectors

3. Adding perpendicular vectors.  45 degrees and 3-4-5 triangle

Problems: Page 41 Plug and chug 1, 2, 3 and page 42 Think and Solve #1

1. Discuss yesterday’s lab

Short Lab:  Use a car, a sheet of paper, a ruler, and a stopwatch.

1) measure the speed of the car.  What was the velocity of the car?

2) run the car over the paper as you pull it fast enough to make the car stand still.  What is the velocity of the car and the velocity of the paper when the car is standing still with respect to the table?

3) Pull the paper so the car stays in one place, and then turn the car 90 degrees while continuing to move the paper at a constant velocity.  What direction does the car go?  What is the velocity of the car?  Calculate what it should be and measure the velocity.  Do the two match up?  Why or why not?

Free Fall Lab

1. Measure the time for a ball to drop from 3 different heights.  Perform each drop at least three times and average your results. Use these times and heights to calculate g. Find the average of all your g calculations.  Accurate and precise measurements will result in the best value for g.  Compare your result to the actual value and write down some reasons why it might be off.  Include a drawing of your experiment in your notes along with a description of what you did.

2. Go to the second floor Science-main building walkway and time the ball dropping from that height.  Find the height of the walkway from your time measurement and the accepted value of g (use 9.8 for the best results).  Measure the height that you dropped the ball at and compare that to your calculation.  Discuss in your notes why you are off and what may have gone wrong.

3. We will all go into the quad and throw a ball as high as possible. We will record the hang time of the ball and calculate the height of the throw.  Show the calculation, the result, and a drawing in your notes showing what happened.

Quiz

Free Fall: How Far?

1. Average speed vs. instantaneous speed review

2. How far depends on average speed because instantaneous speed is changing.

3. Equation for distance fallen.

Questions:

19-21 on page 26

32-33 on page 26

48a on page 27

Quiz tomorrow on velocity, acceleration, and free fall.