# Schedule 1,2 fall 09

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```					                                                     PHYSICS
SCHEDULE: CHAPTERS 1 and 2
Term 1, 2009-2010
Assignment to Be
Date              Completed Before Class                                Classwork
Tues., Sept 8     Find the room                                         Metric estimation, equation rearranging
Instantaneous and Average Velocity

Wed., Sept 9      Read pp. xix-14                                       Unit Analysis, exponents on calculator
Read Class Description & Procedures                   Velocity Problems
Finish packet p.1&2 if necessary
Bring scientific calculator and a red pen

Thurs., Sept 10   Homework #1A                                          Graph interpretation practice
Finish packet p.3&4 if necessary                      Lab: Conceptual Graphing

Fri., Sept 11     Read pp. 15-16                                        Accelerated motion
Homework #1B                                          Begin Lab: Merrily We Roll Along

Mon., Sept 14     Homework #2                                           Finish Lab: Merrily We Roll Along
Moodle Introduction due                               Acceleration units, equations

Tues., Sept 15    Homework #3                                           Concept Dev. 2-1 (front)
Equations of motion

Wed., Sept 16     Read pp. 21-24                                        Gravity and free-fall
Finish back of Concept Dev. 2-1                       Concept Dev. 2-2
Lab: Reaction Time

Thurs., Sept 17   Read pp. 17-21                                        “Time not known” problems
Homework #4                                           Seat-belt problem, graphing pre-test

Fri., Sept 18     Homework #5                                           Graphs of accelerated motion
Internet graphing activity

Mon., Sept 21     Homework #6                                           Review problems and discussion
Moodle assignments due:
Concept Question and Explore Learning Quiz

Tues., Sept 22    Make notecard, collect homework and                   TEST: Chapters 1 and 2
worksheets to turn in, study for test

HOMEWORK
Homework #1A                                              Homework #4 (use g=9.8 m/s2, not10 m/s2)
Review Questions 5, 6 (p. 25)                             Review Questions 16-20, 24 (p. 26)
Supplementary Problems 1, 2                               Think and Explain 39-41 (p. 26-27)
Think and Solve 47 (p. 27)
Homework #1B                                                     Supplementary Problems 18, 19
Supplemental Problems 3-7                          BONUS: Supp. Quest. 15-17 (due start of hour on separate sheet)
Think and Solve 45, 46 (p.27)
Homework #5
Homework #2                                                      Review Question 21 (p. 26)
Supplementary Problems 8-10                               Think and Solve 48-50 (p. 27)
Supplementary Problems 20-24
Homework #3
Review Questions 8, 11-14 (p. 25)                  Homework #6
Think and Explain 34, 36 (p. 26)                          Supplementary Problems 25-31
Supplementary Problems 11-14                             Moodle Assignments: Concept Question and
Explore Learning Quiz
Objectives: Chapters 1&2
•    What is the metric system and how does it help to solve numeric problems?
•    Use scientific notation to solve problems that contain exponents.
•    Rearrange algebraic equations.
•    Explain how scientists make observations, collect and record data and draw conclusions from scientific
experiments.
•    Analyze distance-time, velocity-time, and acceleration-time graphs to determine the motion of an object.
•    Explain how distance, velocity and acceleration are related mathematically and graphically.
•    Define speed and distinguish between instantaneous speed and average speed.
•    Distinguish between speed and velocity, and describe how to tell whether a velocity is changing.
•    Define acceleration and give examples of its units.
•    Describe the motion of an object in freefall.
•    Describe the motion of an object thrown straight up and allowed to fall until it hits the ground.
•    Determine the speed and the distance fallen at any time from rest, when air resistance is negligible.
•    Explain how graphs can be used to describe relationships among time, distance, and speed.
•    Describe how air resistance affects the motion of falling objects.
•    Explain why acceleration is a rate of a rate.
•    Describe how an object can be accelerating while its speed is not changing.

Supplementary Problems

1.   A high school athlete runs 100 m in 12.2 s. What is the speed in m/s and km/h?

2.   Light from the sun reaches Earth in 8.33 min. The speed of light is 3.00 x 108 m/s. How far (in kilometers) is Earth from the sun?

3.   Suppose a car travels at a constant speed of 10 m/s. How far would it move in 1 hour? In 1 minute? In 1 second? In 1 millisecond?

4.   You are driving down a street in a car at 55 km/h. Suddenly a child runs into the street. If it takes you 0.75 s to react and apply the
brakes, how many meters will you have moved before you begin to slow down?

5.   The distance from home plate to the pitcher's mound is 18.5 m. If a pitcher is capable of throwing a ball at 38.5 m/s, how much time
does it take a thrown ball to reach home plate?

Figure 1

6.   Use the position-time graph in Figure 1 above to find:
A. How far the object travels between t = 0 s and t = 40 s.
B. How far it travels between t = 40 s and t = 70 s.
C. How far it travels between t = 90 s and t = 100 s.

7.   Use Figure 1 above to find:
A. The velocity of the object during the first 40 s.
B. The velocity of the object between t = 40 s and t = 70 s.
C. The velocity of the object between t = 70 s and t = 90 s.
D. The velocity of the object between t = 90 s and t = 100 s.

8.   Use the position-time graph, figure above, to construct a table showing the velocity of the object during each 10-s interval over the
entire 100 s.
9.   Plot a velocity-time graph using the table from Exercise 8.

10. A car moves along a straight road at a constant velocity of 40 m/s.

A.   Plot a position-time graph for the car for 6 sec.
B.   Find the slope of the curve using two different points along the line.
C.   Plot a velocity-time graph for the car. What does the area under the curve of the graph represent?
D.   Calculate the area under the “curve” of the graph between the fifth and sixth seconds. What does
this area represent?

11. An Indy-500 race car's velocity increases from 4.0 m/s to 36 m/s over a 4.0-s period. What is its acceleration?

12. A bus is moving at 25 m/s. The driver steps on the brakes, and the bus stops in 3.0 s. What is the acceleration of the bus?

13. Suppose the bus took twice as long to stop. Calculate the new acceleration. How would this acceleration be related
to the acceleration you found in #2?

14. A race car accelerations from rest at 7.5 m/s2 for 4.5 s. How fast will it be going at the end of that time?

Questions 15-17: A car stops suddenly from a speed of 30 mph.        Two people are riding in the car; the driver is wearing a seatbelt,
while the passenger is not.

15. Change 30 mph to m/sec. (HINT: 1 mi. = 1.6 km)

16. Because the driver is wearing a seat belt, he stops with the car in .10 sec.

A. What is the (stopping) acceleration of the car and the driver?
B. What is the stopping distance?
C. What does this stopping distance mean; in other words, what is happening?

17. Because the passenger is not wearing a seat belt, he does not stop with the car. Instead, he flies forward (why?) and stops suddenly
upon contact with the dash. This stopping time is only .02 sec.

A. What is the (stopping) acceleration of the passenger?
B. What is the stopping distance?
C. What does this stopping distance mean; in other words, what is happening?

18. A car traveling at 44 m/s is uniformly decelerated to a speed of 22 m/s over an 11-s period. What distance does it travel during this
time?

19. A plane flying at the speed of 150 m/s is accelerated uniformly at a rate of 5 m/s2 for 10 seconds.

A. How fast it is going at the end of 10 seconds?
B. How far does it travel in that 10 seconds?

20. An engineer is to design a runway to accommodate airplanes that must gain a ground speed of 60 m/s before they can take off.
These planes are capable of being accelerated uniformly at the rate of 1.5 m/s2.

A. How long will it take them to achieve take-off speed?
B. What must be the minimum length of the runway?

21. A. How far does an object fall in 10 seconds?
B. How fast will a falling object be going after 10 seconds?

22. A. How long will it take an object to fall 2 m?
B. How long will it take an object to fall 4 m?
C. How do these two times compare?

23. How fast must you throw a ball straight up if you want it to reach a height of 30 m?

24. Police find skid marks 60 m long on a highway showing where a car made an emergency stop. Assuming that the deceleration was –
10 m/s2 (about the maximum for dry pavement), how fast was the car going? Was the car exceeding the 80 km/h speed limit?
25. The velocity of an automobile changes over an 8-s time period as shown below.
Time (s)    Velocity (m/s)                       Time (s)    Velocity (m/s)
0.0          0.0                                  5.0        20.0
1.0          4.0                                  6.0        20.0
2.0          8.0                                  7.0        20.0
Distance (m)               3.0          12.0                                 8.0        20.0
4.0          16.0

A.   Plot the velocity-time graph of the motion.
B.   Determine the distance the car travels during the first 2.0 s.
C.   What distance does the car travel during the first 4.0 s?
D.   What distance does the car travel during the entire 8.0 s?
E.   Find the slope of the line between t = 0 s and t = 4.0 s. What does this slope represent?
F.   Find the slope of the line between t = 5.0 s and t = 7.0 s. What does this slope indicate?

26. Use Fig. 2 to find the acceleration of the moving object.

A.   During the first 5 s of travel.
B.   During the second 5 s of travel.
C.   Between the tenth and the fifteenth second of travel.
D.   Between the twentieth and twenty-fifth second of travel.

27. Refer to Fig. 2 to find the distance the moving object travels.

A.   Between t = 0 s and t = 5 s.
B.   Between t = 5 s and t = 10 s.
C.   Between t = 10 s and t = 15 s.                                                               Fig. 2
D.   Between t = 0 s and t = 25 s.

FIG. 3                          FIG. 4                       FIG. 5                           FIG. 6

28. Look at Fig. 3.
A. What kind of motion does this graph represent?
B. What does the slope of the graph represent?

29. Look at Fig. 4.
A. What kind of motion does this graph represent?
B. What does the area under the line of the graph represent?

30. Look at Fig. 5.
A. What kind of motion does this graph represent?
B. What does the slope of the line represent?
C. What does the area under the line represent?

31. Look at Fig. 6.
A. What type of curve does this graph represent?
B. What does the slope of the line taken at any point represent?
C. How would slopes taken at higher points on the line differ from those taken at lower points?

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