Physics Fall 2020 Assignments

1) Which pushes a goal keeper in soccer further into the goal when he jumps into the air to catch a shot on goal:
A) The ball bounces off the keeper
B) The keeper catches the ball
C) It is the same either way

2) What does the term "muzzle velocity mean?

3) What does "impulse" mean?

4) Explain how a Pelton Water Wheel gives you more power than the common water wheels of the time.

5) How does a longer barrel yield higher speeds for bullets than a shorter barrels?

6) Why does a pistol recoil at a higher speed than a riffle assuming both fire the same ammunition?

Please upload your work and answers. Your answers go in the Duncan Box. The Duncan Box is to be in the bottom right corner of the first page. Verify that all of your uploaded attachments are legible. The test should take about 40 minutes, but you may have the entire period to take the test and upload it.

Here are the answers. Compare them to your answers to make sure your test was graded correctly. 1/2 credit was awarded for power of 10 issues. I didn't record all of the answers to the 2nd decimal place due to round off. For example, if the calculated height was 0.334 and you used 0.33, that would change your answer in the one's column.
1) 197
2) 0.10
3) 1.83
4) 12.88
5) 17.97 (plus or minus 0.10)
6) 250
7) 5.89x10^7
8)1.06x10^5
9) 4:9 or 9:4 or 1:2.25 or 1:0.44
10) 1,879
11) 910
12) 2400
13) 9.60

Post your quiz as an assignment. Don't forget to hit submit when you turn it in.
Answers:
1. 43.3 kW
2. 6,800 sec
3. 0.22 m
4. 1.3x10^2 J

Upload your work. I will post the questions after all periods have taken the quiz.
Answers:
1 = 845.19 J
2 = 4.63 m
3 = 156.64 J
4 = 0.71:1 or 1.4:1

Skip 5C#5. It is the toughest question in the book.

The video is posted under homework. Please open and submit the assignment from there. Remember to hit "submit", or "turn in" your assignment. Some students are forgetting to do that, thus, Google Classroom shows it as a missing assignment, even though it was turned in.

Watch the video on 11-18-2020.
Record 5 things that you thought were interesting, or well-explained, or a good example.
Include the aproximate time stamps when the video starts and stops talking about that.
You can't use my examples

Example:
1) Start 05:50 End 06:30
Energy of being. He explained what E = mc^2 is about. Kind of cool that mass is actually energy and energy is a form of mass.

2) Start 35:00 End 38:20
Demonstration of the hand-cranked generator and a light. Energy goes from mechanical to electrical to heat to light.

Upload your work. Verify the documents you upload are all there, are in focus, and contain all the information you intended to upload. I will email you your individual test test at the start of class.

Be sure to create a Duncan Box to list your answers. I included an example of a Duncan Box at the end of the test.

11-16-2020
Please check your answers to verify I graded your test correctly. I can meet with you to go over any of the questions. Remember, if your answer is w/in 1% of mine or the +- 1 of the last decimal place, you generally will get credit if the difference is due to round off error. For example, for question 12, if your answer was 54.76, you would get credit. If your answer for #3 was 0.18 you would also get credit though that is more than 5% different, but is +- the last decimal place.

1. 19
2. 8,000
3. 0.19
4. 1.22
5. 2.61
6. 1.85
7. 56
8. 0.76
9. 119.01
10. 34.49
11. 8 or the same
12. 54.52
13. The same

Please doe the following questions from the end of chapter #4 starting on page 152. I included the answers. I do not have worked out solutions for these. You have until Saturday to turn them in. Test is Monday or Tuesday.

page 152 Answers
20 3.52
21 4.70E+02
23 6.00, 72.0, 63.6
24 4.8, 7.8
37 0.70, 0.60
38 0.436
41 1.4
45 55
54 2, The box will never move. The force is not enough

Redo the homework for this chapter. If there is a problem that you don't know how to solve, look at the solutions that are posted with the assignment. If you still don't understand, copy the solution from the posted solutions. You will then need to get help with how to solve it.

Up to six points. 5 extra credit. Some of you might not have taken notes (though you were told during the lecture to copy down what I wrote on the board for examples 4-6). I typed up using numbers 4 - 6, though the numbers might have been different for your period. I might again to see your six flash cards (3x5 cards) problems on Thursday or Friday.

It is likely that you willhave to watch the video. I walk through how to do questions 1,3,& 4.

Watch the video. Repond with two examples that you found interestesting. Explain them in your own words. Each example should be at least one paragraph long.

Periods 5 and 6 will do this 10/27/20 and will have lecture on 10/30/20. Periods 3 and 4 will do this on 10/29/20 and have lecture on 10/26/20.

Practice 4C

Practice 4B

Although I gave the homework assignment during class, I didn't post the assignment on Google Classroom until Friday night, thus I put the due date back to Monday 10/19/2020.

You are going to make an outline of the chapter. You will sketch every page starting at page 124 through and including page 149. EVERY page including pages like page 149, and page 145. The purpose is to help solidify in your mind what the chapter is about. The amount of time I want you spending on each page WRITING (doesn't include reading) is 1 to 3 minutes. The standard is "prove to the teacher that you unquestionably read the page, not just skimmed the page."

FORMAT:
Write the page number in the center of the line (center justified).
Three bullets
Convey the information from the page. You can do that with a quick sketch, an equation, a real life example, a problem or question.

The following examples are hypothetical examples. Page 97 doesn't actually talk about these things. I am using them to show the formatting.
Example:
page 97
bullet: I make a quick sketch of a heavy car being pushed yielding a small acceleration
bullet: I make a quick sketch of a light car being pushed yielding a large accereration
bullet: "I remember we ran out of gas. We had to push the car two blocks to the gas station. It was hard for us to accelerate the truck b/c there were just two of us and the truck was really heavy."
skip a line
page 98
bullet: F = ma
bullet: A sketch of the sample problem from the page
bullet: Friction slows you down

page 99


You do every page INCLUDING PAGES THAT ARE JUST WORKED OUT EXAMPLES.

Watch the video. Write down the examples or object he used in the video to explain Newton's 1st law.
Write down what object or thing he used as the example such as a bird on a tree, a cannon ball, a hockey puck, an anvil and a large hammer, painter and rope, Cadilac cars, etc. He uses a gazillion examples instead of teaching from only the equations.

Write one or two sentences per example about how he used the object to explain Newton's 1st law.
Skip a line on your paper.
Write the next example.
You may type the assignment. (I type faster than I write. You might also.)
Example:
Anvil on his chest: He is showing that if you hit a heavy object it doesn't accelerate much so you don't get hurt if the object is on your chest

Object dropping from a tree: Showing that the object keeps moving sideways with the rotation of the earth.



Prove to me that you watched and LISTENED to the entire video. If you come up with examples from the 1st half but almost nothing from the second half of the video, I will likely think that you didn't listen much to the second half of the video. I will choose several object/examples from the video and look for those examples in your assignment.

It is anticipated that it will take you 15 to 20 minutes to write the assignment plus 45 minutes to watch the video. You should pause the video when you write.

Upload your photos of the test. Make sure they are in focus. Record your answers in a Duncan box.

Jack the Thug at an Angle
Soccer Ball Header
Upload both quizzes here.
Write down all four answers in the bottom righ tcorner of your paper and draw a box around them.
t =
x =
Speed =
Angle =

The answers for the soccer ball header
t = 3.32 sec
X = 81.57 m
Speed = 28.98 m/sec
Angle = 32.01

The answers for Jack the Thug at an angle at the ground
t = 2.24 sec
X = 16.51 m
Speed = 18.35 m/sec
Angle = 66.33

Questions about the ball hitting the ground after being launched upward at an angle from the roof of a building:
the time when the ball hits the ground
the x-coordinate where the ball hits the ground
The speed of the ball just before it hits the ground
The angle of the ball just before it hits the ground

Questions about a header in soccer:
the time when the ball hits the the head
the x-coordinate where the ball hits the head
The speed of the ball just before it hits the head
The angle of the ball just before it hits the headd

Redo each problem twice. Upload a photo of each (four photos total)
Copy pages 9 -19 for Jack the Thug at an angle and the EC soccer.

Start at page 7 for Jack-the-Thug

Solve Jack-the-Thug problems with the ball rolling off the table horizontally.
Building height 15 m
Vi = 5 m/s
Solve for:
Time to hit the ground
x,y) coordinates where it hits the ground
speed as it hits the ground
angle as it hits the ground
Redo it a second time on a separate sheet of paper

Solve twice the Jack the Thug problems with the ball rolling off the table at a 25 degree angle above the horizontal.
Building height 15 m
Vi = 5 m/s
Angle of launch is 25 degrees above the horizontal
Solve for:
The (x,y) coordinates at maximum height,
Time to the maximum height
Speed at maximum height
The (x,y) coordinates where it hits the ground
The total time in the air from leaving the building to hitting the ground
The speed of the ball as it hits the ground
The angle of the ball as it hits the ground
Redo it a second time on a separate sheet of paper

Upload the four separate sheets of paper, that is, you will do each problem twice on separate sheets of paper. You must submit it by Thursday, or no credit.

Be sure to show all of your work. I changed the due date to Tuesday.

Attach your answers

Be able to calculate how much time it takes for a soccer ball to reach maximum elevation on a goal kick given the initial speed and direction.
Be able to calculate how the maximum height of the soccer ball from a goal kick given the initial speed and direction.
Calculate the speed of the ball at the maximum height.

You need to practice this one problem many times, again, and again, and again, and .... until it becomes boring, then do it again. The quiz will be timed. You will not have much time to take the quiz. If you work slowly, then you need to practice the problems so many times that you don't have to think about it.

Be sure to show all of your work. Don't just write the answers.

Be sure to box your answers. Show all of your work.

Test will be given Tuesday September 8th for periods 3 & 4, or Wednesday September 9th for periods 5 & 6 during class time. I will email you your test during class time. The test is due at the end of the period. Send me your test as an attachment.

As a reminder, there will be a "redo" test Thursday 9-17-20 from 1:30 - 2:35 pm sharp to improve your test score or as a makeup for those who missed the test.

If you would like to look over your test, here are the answers:
Version #1 of the test had Vi as 9 m/sec for question #1
Version #2 of the test had Vi as 11 m/sec for question #1

Question # Version #1 Units
1 -9 m/s
2 1.83 sec
3 6.4 hours
4 60.64 km/hr
5 4 sec
6 14.27 m/s
7 35.74 m
8 19.52 m/sec
9 150.69 m
10 20.7 m/sec
11 5.8 m
12 sketch
13 40 m
14 5 to 8 sec
15 31 m
16 7 m/sec
17 0 m/sec^2

Question # Version #2 Units
1 -11 m/s
2 2.24 sec
3 6.4 hours
4 59.38 km/hr
5 6 sec
6 12.04 m/s
7 49.72 m
8 18.84 m/sec
9 73.41 m
10 19.31 m/sec
11 4.78 m
12 sketch
13 24 m
14 0 to 3 sec
15 23 m
16 5 m/sec
17 2.33 m/sec^2

Test will be given Monday September 7th for periods 3 & 4, or Tuesday September 8th for periods 5 & 6 during class time. I will email you your test during class time.

Take the practice test. Scan or take photos of your work. Submit your work via Google Classroom. Verify the answers, that is check your work.

Starting on page 69: 1-4,8-14,-20-30
Answers attached.

Starting on page 69: 1-4,8-14,-20-30
Answers attached.

Don't worry about the calculus shown in the video. You just need to get the concepts. I need to provide some kind of a check to verify that you watched it. Describe/list which rides at Magic Mountain are shown. Send me the list of the rides you see as your homework assignment. The ride where you drop is no longer there. It was called FREEFALL.

Don't worry about the calculus shown in the video. You just need to get the concepts. I need to provide some kind of a check to verify that you watched it. Describe/list which rides at Magic Mountain are shown. Send me the list of the rides you see as your homework assignment. The ride where you drop is no longer there. It was called FREEFALL.

Do the homework on a separate sheet of paper. Send me a photograph of your work.

Do the homework on a separate sheet of paper. Send me a photo of it.

Predict which will hit first when a heave and a light object fall from rest and the same height (ignore air friction).
A = the heavy
B = the light
C = a tie

Film the fall as evidence.
Submit the video (less than 15 seconds).

Predict what happens to two sheets of paper held vertically about 1 to 2 inches apart when air is blown hard between them.
A = The papers move further apart.
B = The papers rattle, but stay the same distance from each other.
C = The papers come closer together.

Repeat the experiment blowing air slowly.

Video the experiment and send it to your teacher.

There is no need to copy the questions. Just record the answers showing work where appropriate. Take a picture of your work and submit that.

There is no need to copy the questions. Just record the answers showing work where appropriate. Take a picture of your work and submit that.

Download the meeting schedule to your computer, phone, or other electronic device.