Final Exam -- 10:45-12:45 on Monday, 6/19 |
Class
40:
Tuesday, 6/13/23 Warm-up: None
Today:
Homework:
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Class
39:
Friday, 6/9/23 Warm-up: In order for this warmup to make sense, you first need to know something interesting about light... Fred is conducting a laser experiment on a very, very, very fast train. He attaches a mirror to the roof of the train car and shines a quick pulse of laser light directly upward at the mirror. Hank is standing still outside the train. The train car is made of glass, so Hank can see the whole thing. The pulse of laser light goes up, reflects off of the mirror, and then goes back down to the floor. There's enough dust in the air to make the laser pulse visible. 1) If Fred and Hank were to draw the laser pulse's "flight path" (as each of them sees it), what would each of them draw? 2) Who would see light travel a greater distance? 3) Assuming that the speed of the laser light is the same for both observers, who sees it travel for the longest amount of time?
Today:
Homework:
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Class
38:
Wednesday, 6/7/23 Warm-up: What's happening in the picture on the right? Today:
Homework:
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Class
37:
Monday,6/5/23 Warm-up: The diagram below shows top views of the same boy looking into mirrors. On the right, the mirror is a simple flat mirror. On the left, the mirror is two separate mirrors arranged at right angles. The boy has one blue eye and one green eye. When he looks in the mirrors, where will his blue eye appear to be? Why?
Today:
Homework:
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Class
36:
Thursday,
6/1/23 Warm-up:
Today:
Homework:
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Class
35:
Tuesday,
5/30/23 Warm-up: Does the Airzooka send a wave through the air? How can we tell if it's a wave? Today:
Homework:
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Class
34:
Thursday,
5/25/23 Warm-up: I am going to submerge an open pvc pipe in water. Then I will pull the pipe vertically out of the water, holding a ringing tuning fork next to it. At some point(s) the sound of the tuning fork will get louder and then quieter again. 1. Why will the sound get louder? 2. If we measure the pipe height at which the sound gets loud, we can calculate the speed of sound. How?
Today:
Homework:
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Class
33:
Tuesday,
5/23/23 Warm-up: This demonstration is like the demonstration of standing waves in a string. This piece of metal resonates with the speaker at a variety of natural frequencies. 1. Where are the nodes and where are the antinodes? 2. What's your reasoning? Today:
Homework:
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Class
32:
Friday,
5/19/23 Warm-up: The red wave is traveling rightward along a string that is tied to a post. When it hits the post, the wave will reflect (echo) and travel backward through itself.
What will it look like when two identical waves pass through one another?
Today:
Homework:
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Class
31:
Wednesday,
5/17/23 Warm-up: If you're standing next to a race track, what do you hear as the cars pass you? a. The cars' pitches change from high to low. b. The cars' pitches change from low to high. c. There is no change in pitch. Today:
Homework:
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Class
30:
Monday,
5/15/23 Warm-up: Is this a real photo of a string? Today:
Homework:
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Class
29:
Thursday,
5/11/23 Warm-up: If you see lightning strike a point 1 mile away, how long can you expect to wait before you hear thunder? Why?
Today:
Homework: Two things...
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Class
28:
Tuesday,
5/9/23 Warm-up: What is a wave? What is a sound? How do ears work?
Today:
Homework: Complete practice questions on packet p. 7-8, except for number 9 and the wavelength on number 16. Notes and homework answers |
Class
27:
Friday,
5/5/23 Warm-up: How is an electric generator like an electric motor?
Today:
Homework: None |
Class
26:
Wednesday,
5/3/23 Warm-up: How does this electric motor work? How can it be improved?
Today:
Homework: None
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Class
25:
Monday,
5/1/23 Warm-up: 1. What is sound? 2. What's happening in the "Amazing Water and Sound Experiment?" Today:
Homework:
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Class
24:
Thursday,
4/20/23 Warm-up: What is a solenoid? How does it work? Today:
Homework:
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Class
23:
Tuesday,
4/18/23 Warm-up:
When electric current flows through an electric motor, a force is produced, causing motion. An electric motor forced into motion generates electric current. I have three identical corded drills and one driver bit. With no additional materials, how can we power two of the drills by plugging just one of them into the wall?
Today:
Homework:
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Class
22:
Friday,
4/14/23 Warm-up: What happens when you try to electrocute a pickle using a standard household 120V outlet? Will this work on other things?
Today:
Homework:
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Class
22:
Wednesday,
4/12/23 Warm-up: Which batteries and pumps on the right push out the most current? The least? How many amps of current flow from each battery?
Today:
Homework:
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Class
21:
Monday,
4/10/23 Warm-up: Can we create a circuit with an electronic dog collar as the battery and people as the resistors?
Today:
Homework:
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Class
20:
Thursday,
4/6/23 Warm-up: 1. How can you start a fire with a 9 Volt Battery and some steel? 2. Ohm's Law says V = IR. Guess what each of the letters means. Solve for I. Solve for R. 3. P = VI. Guess what each of the letters means. Solve for V. Solve for R.
Today:
Homework:
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Class
19:
Tuesday,
4/4/23 Warm-up: The pictures on the right show breaker panels. 1. What is the purpose of a breaker? 2. How does an electrician decide how many breakers are needed? 3. Why are there different kinds of breakers?
Homework:
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Class
18:
Friday,
3/31/23 Today:
Homework:
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Class
17:
Wednesday,
3/29/23 Today:
Homework:
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Class
16:
Monday,
3/27/23 Today:
Homework:
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Class 15:
Wednesday,
3/22/23 Warm Up: How does an electric fence work?
Today:
Homework:
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Class 14:
Monday,
3/20/23 Warm Up: None
Today:
Homework:
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Class
13:
Friday,
3/17/23 Warm Up: Why is the guy in the video wearing a metal suit?
Today:
Homework:
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Class
13:
Thursday,
3/16/23 Warm Up: What do you think will happen if we make John Travoltage rub his foot on the floor and then hold his hand by the doorknob? Why?
Today:
Homework:
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Class
12:
Tuesday,
3/14/23 Warm Up: There is a "pith ball" hanging next to the Van de Graaff generator. The pith ball is foam that is covered with a conductive, metallic paint. What do you think will happen when the Vand de Graaff generator is turned on? Why? Today:
Homework: |
Class 11:
Friday,
3/10/23 Warm Up: 1. What events contributed to this gas station fire? 2. How could it have been prevented? Today:
Homework:
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Class
10:
Wednesday,
3/8/23 Warm Up: How does a Van de Graaff Generator Work? Today:
Homework:
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Class
9:
Tuesday,
2/21/23 Warm Up: Which of the following can we say with certainty? Why? A) The balloons have the same net charge B) The cat and the foam "peanuts" have opposite net charges. C) Both A and B are correct. D) None of these answers is (are) correct.
Today:
Homework:
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Class
8:
Wednesday,
2/15/23 Warm Up: When you rub a balloon on your hair, why does the balloon then stick to the wall? Today:
Homework:
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Class 7:
Monday,
2/13/23 Warm Up: If you rub a balloon on your head and then hold it next to your hair, your hair is attracted to the balloon, and both your hair and the balloon are attracted to other stuff. Why?
Today:
Homework:
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Class
6:
Thursday,
2/9/23 Warm Up: 1. What's the purpose of pulley systems like these? 2. How do they work, in terms of work (W=Fd)?
Today:
Homework:
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Class
5:
Tuesday,
2/7/23 Warm Up: Let's calculate the efficiency of a typical arrow shot from a typical bow. How can we do it? We can get our data from the internet.
Today: -- Short break! --
Homework:
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Class 4:
Wednesday,
2/1/23 Warm Up: A trebuchet's projectile is launched as its counterweight falls, thereby turning PE into KE and accelerating the projectile. 1. Does the projectile do work on the counterweight or vice-versa? Or does each do work on the other? Explain. 2. At which end of the trebuchet arm does the work being done look like this -- Fd ?
Today:
Homework:
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Class
3:
Monday,
1/30/23 Warm Up: All of these "machines" work by changing the nature of work, but not the amount of work. W=Fd. 1. Identify all of the machines that the user's work so that it looks like... W=Fd. Explain why anyone would want to change work in this way. 2. Identify all of the machines that the user's work so that it looks like... W=Fd. Explain why anyone would want to change work in this way.
Today:
Homework:
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Class
2:
Thursday,
1/26/23 Warm Up: 1. Can you guess what the "Sisyphus train" does? [Hint: it is an attempt to solve a big renewable energy problem.] 2. How did it get that nickname? 3. Starting from rest, a car travels 20m in 4 seconds. What are its... 1) Initial Speed? 2) Average Speed? 3) Final Speed?
Today:
Homework:
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Class
1:
Tuesday,
1/24/23 Warm Up: What is this simulation supposed to demonstrate? Today:
Homework:
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