Class
34.5
Friday,
12/15/17 Warm Up : 1. What does the "sisyphus train" do? 2. How did it get that nickname? 3. What are conservative forces? Today: Online Textbook (OpenStax) Reading: Homework:

Class
34
Thursday,
12/14/17 Warm Up : An ideal spring has a constant, k, that describes the relationship between stretch distance and tension. The units for k can be N/m. Suppose a screen door spring has a spring constant k = 40N/m. 1. What is the tension in the spring when it is stretched 1m? 2. What is the tension in the spring when it is stretched 20cm? 3. How much work is required to stretch the spring by 1m, starting with 0N of tension in the spring? 4. How much work is required to stretch a spring x meters if its spring constant is k? 5. PE_{spring} = ? Today:
Online Textbook (OpenStax) Reading: Homework:

Class
33.5
Wednesday,
12/13/17 Warm Up : 1. A 1kg ball travels directly upward. Its initial KE = 8J. How much kinetic energy will it have when it reaches its highest point? (ignore air resistance) 2. How much potential energy (PE) will it have when it reaches its highest point? 3. As the ball rises, what is doing work on what? 4. What is the formula for gravitational PE, and where does it come from? Today:
Online Textbook (OpenStax) Reading: Homework:

Class
33
Tuesday,
12/12/17 Warm Up : 1. Calculate the work done according to each of the graphs. Today:
Online Textbook (OpenStax) Reading: Homework:

Class
32.5
Monday,
12/11/17 Warm Up : 1. Read statement from Mr. Reardon  forgot on Friday. 2. Is tension the same in all parts of the slinky on the right? 3. What happens when you suspend a slinky (as shown in the photo on the right) and then drop it? Today:
Online Textbook (OpenStax) Reading: Homework:

Class
32
Friday,
12/7/17 Warm Up : No warmup. Read statement from Mr. Reardon. Today:
Online Textbook (OpenStax) Reading: Homework:

Class
31.5
Thursday,
12/7/17 Warm Up : 1. How does this yoyo work? What do the springs and steel balls do? 2. If you graphed the velocity of a yoyo, would it look like this?
Today:
Online Textbook (OpenStax) Reading:
Homework:

Class
31
Wednesday,
12/6/17 Warm Up : 1. Does it take longer for the satellite to travel from point A to point B or from point C to point D? 2. How can Kepler's 2nd Law be used to prove the answer to #1?
Today:
Online Textbook (OpenStax) Reading:
Homework:

Class
30.5
Tuesday,
12/5/17 Warm Up : 1. What is a geosynchronous satellite? 2. What's the difference between a geosynchronous orbit and a geostationary orbit? 3. What is a space elevator? 5. Please do not leave anything permanent or semipermanent (like stickers) in the classroom. Today:
Online Textbook (OpenStax) Reading:
Homework:

Class
30
Monday,
12/4/17 Warm Up : 1. How can the coin be removed from the disc pictured on the right?  without banging the disc with or against something 2. What is the difference between elevation and orbital radius? Today:
Online Textbook (OpenStax) Reading:
Homework:

Class 29.5
Friday,
12/1/17 Warm Up : 1. How are gforces dangerous to pilots? 2. How does your body sense weight and weightlessness? What causes "butterflies in the stomach?" 3. How does an accelerometer work? Today:
Online Textbook (OpenStax) Reading:
Homework: Practice problem #11. 
Class 29
Thursday,
11/30/17 Warm Up : 1. During what month are we closest to the sun? When are we farthest? 2. Rank the seasons in order of length. Answer Today:
Online Textbook (OpenStax) Reading:
Homework:

Class 28.5
Wednesday,
11/29/17 Warm Up : Are astronauts weightless when they are in the international space station? Is this candle weightless? Today:
Online Textbook (OpenStax) Reading:
Homework:

Class 28
Tuesday,
11/28/17 Warm Up : No warmup. Quiz. Today:
Online Textbook (OpenStax) Reading: Homework:

Class 27.5
Monday,
11/27/17 Warm Up : Consider an object tied to a string and swinging in horizontal circles. What forces are acting on the object? Today:
Online Textbook (OpenStax) Reading:
Homework:

Class 27
Friday,
11/17/17 Warm Up : From last year's EPS 200 class... The Sun, Earth, and Moon are continually spaghettifying one another. We see the effects of this spaghettification in the form of tides. 1. What causes spaghettification and tides? 2. How much gravitational force do the Sun and Moon each exert on 1,000,000 pounds of water? 3. There are tides on the Moon. Explain. 4. Why do we always see the same side of the moon? 5. Is the Earth's 24 hour rotational period speeding up or slowing down over time? Answer Perplexing questions: Are tides equally high on the near and far side of the Earth from the Moon? Are high tides equally high during full and new moons? Why or why not? How would one model this? Today:
Online Textbook (OpenStax) Reading: Homework:

Class 26.5
Thursday,
11/16/17 Warm Up : If you need to stop a car quickly, why should you avoid locking the tires or skidding? Today:
Online Textbook (OpenStax) Reading:
Homework:

Class 26
Wednesday,
11/15/17 Warm Up : 1. In the Energy Skate Park simulation on the right, what happens to kinetic and potential energy as the skater gets higher and lower? 2. There is no thermal energy. What does that tell us? 3. What happens to the total amount of energy as the skater moves? 4. Can you tell from the picture and diagram which way the skater is moving? 5. If you're considering the situation on the right from a systems of equations perspective, how many variables and equations did we use to find T_{1} and T_{2}? 6. And, by the way, where would you come out if you dropped frictionlessly straight through the center of the Earth? (antipodes map) Today:
Online Textbook (OpenStax) Reading:
Homework:

Class 25.5
Tuesday,
11/14/17 Warm Up : In the absence of friction, if you made a hole through the center of the Earth, it has been shown that you would come out the other side in approximately 42 minutes. 1. What else would happen to you? 2. Where would you come out? 3. The 42 minutes has been shown to be wrong. Why? Would the trip actually be longer or shorter? 4. What if there were air resistance? Excel spreadsheet  falling through the earth Today:
Online Textbook (OpenStax) Reading:
Homework: Complete #2 of Masses Hanging and Dragged at Angles Solutions to #1 and #2 
Class 25
Monday,
11/13/17 Warm Up : The picture on the right shows how a chain can be used to pull a stuck car out of the mud. All that is required is a small sideways force applied to the center of the chain. Why does this work? Today:
Online Textbook (OpenStax) Reading:
Homework: Complete #4 of Masses Hanging and Dragged at Angles solutions to 3 and 4 
Class 24.5
Friday,
11/10/17 Warm Up : How many 100 psi water bottles would it take to launch a human? Today:
Online Textbook (OpenStax) Reading:
Homework: None 
Class 24
Thursday,
11/9/17 Warm Up : Let's use this air density calculator and the current weather conditions to determine the density of the air outside. Today:
Online Textbook (OpenStax) Reading:
Homework:

Class 23.5
Wednesday,
11/8/17 Warm Up : 1. How many square meters is one square centimeter? 2. The diagram on the right comes from this online Water rocket simulator. What effect does each of the parameters have on rocket performance? Today:
Online Textbook (OpenStax) Reading:
Homework: Complete #2 in Bodies on Inclines Answers (and some solutions ) to Bodies on Inclines 
Class 23
Tuesday,
11/7/17 Warm Up : 1. If there is no friction acting on the block, what is its approximate downhill acceleration? 2. If there is friction between the block and the ramp, describe all of the individual forces that are acting on the block. You may assume that the block and ramp are in a vacuum. 3. Approximate the value of µ_{s} that is necessary to prevent the block from sliding. Today:
Online Textbook (OpenStax) Reading:
Homework: Complete 1a and 1b in Bodies on Inclines Answers (and some solutions ) to Bodies on Inclines

Class 22.5
Monday,
11/6/17 Warm Up : 1. How does a weather vane work? 2. If you drop a model rocket from a great height, which end will hit the ground first? Why? 3. If you drop a hammer from a great height, which end will hit the ground first? Why? 4. What part of a hammer has the greatest terminal velocity. 5. If you want your rocket to fly "straight," what design features should you include? Today:
Online Textbook (OpenStax) Reading:
Homework: Finish the spreadsheet before next class. Submit the spreadsheet using this form. 
Class 22
Friday,
11/3/17 Warm Up : Consider the same mass, string, and angle as before, but now the mass is exposed to the oncoming air. The angle is still constant. [Air density = 1.2kg/m^{3}. C_{d sphere} = 0.45. A_{sphere} = 0.05m^{2}] 1. Describe the motions of the mass and the train car in qualitative terms. 2. What is the tension in the string? 3. Describe the motions of the mass and the train car in quantitative terms. Today:
Online Textbook (OpenStax) Reading:
Homework: None

Class 21.5
Thursday,
11/2/17 Warm Up : A 1kg mass is suspended by a string from the ceiling of a train car. The angle shown remains constant. 1. Describe the motions of the mass and the train car in qualitative terms. 2. What is the tension in the string? 3. Describe the motions of the mass and the train car in quantitative terms. Today:
Online Textbook (OpenStax) Reading:
Homework: Consider the warmup diagram, above. Suppose the indicated angle is 30º and the mass is 3kg. In this case, what is the tension in the string? What is the train's acceleration? 
Class 21
Wednesday,
11/1/17 Warm Up : No warmup Today:
Online Textbook (OpenStax) Reading: Homework: 
Class
20.5
Tuesday,
10/31/17 Warm Up : A water rocket contains pressurized air and water. 1. Is the "fuel" the water, the air, or both? 2. What determines the force of drag acting on a water rocket? Today:
Online Textbook (OpenStax) Reading: Homework:

Class
19.5
Friday,
10/27/17 Warm Up : What if I put a large rock on my head, with a 2"x4" on top of the rock, and then I have someone hammer a nail through the 2"x4"? Is that a good idea? Today:
Online Textbook (OpenStax) Reading: Homework:

Class
19
Thursday,
10/26/17 Warm Up : Why can no one in the world can throw a wiffle ball with a force greater than about 60N (13.5 pounds)?
Today:
Online Textbook (OpenStax) Reading:
Homework:

Class
18.5 Wednesday,
10/25/17 Warm Up : The figure on the right shows some masses connected by an unstretchable chain of negligible mass that travels over a frictionless, massless pulley in a vacuum. Assume that each object has a mass of approximately 1kg and a weight of approximately10N. 1. What net force is acting on the system of objects? 2. What are the objects' accelerations? (magnitude and direction) 3. How do the rope tensions, T_{1}, T_{2}, and T_{3} compare? Rank them according to magnitude.
Today:
Online Textbook (OpenStax) Reading:
Homework:

Class
18 Tuesday,
10/24/17 Warm Up : Emergency clinic records of 132 cats that jumped from windows of buildings showed a 90% survival rate. The average drop was 5.5 floors.
Injuries increased with increasing heights up to 7 floors.
When cats fell from over 7 floors, they actually suffered from
“less injuries.”
1. When does a falling cat experience zero net force? 2. When is a falling cat a "freefalling" cat? Today:
Online Textbook (OpenStax) Reading:
Homework:

Class
17.5 Monday,
10/22/17 Warm Up : None Today:

Class
17 Wednesday,
10/18/17 Warm Up : 1. How does NASA simulate weightlessness? 2. You are trying to transfer some drippy sauce across a dinner table using only a drippy spoon. The sauce needs to go from the pot to your plate without dripping. Touching only the spoon, how can you make this happen? Today:
Online Textbook (OpenStax) Reading:
Homework: Due next Tuesday  Mr. Stapleton will be gone on Monday 
Class
16.5 Tuesday,
10/16/17 Warm Up : One way to find the center of mass (a.k.a. balance point) of a stick is to support it with two level hands and then slowly move those two hands together until they meet under the stick's center of mass. Why does this method work? Today:
Online Textbook (OpenStax) Reading:
Homework: 
Class
16 Monday,
10/16/17 Warm Up : Tension is the force exerted on and exerted by a stretched rope. 1. If we assume that the rightmost team is winning in the picture, how does the tension on the right half of the rope compare to the tension on the left half of the rope? 2. In which direction does the force of tension act? 3. Does the winning team pull the hardest? Today: Online Textbook (OpenStax) Reading:
Homework:

Class
15.5 Friday,
10/13/17 Warm Up : There is a heavy object tied to the ceiling with a string. Another segment of the from the same roll of string is hanging from the object. I am going to pull on the bottom string until one of the two strings breaks. Which string is going to break first? Why? Today:
Online Textbook (OpenStax) Reading:
Homework:

Class
15 Thursday,
10/12/17 Warm Up : No warm up today Today: Test Online Textbook (OpenStax) Reading:
Homework:

Class
14.5 Tuesday,
10/11/17 Warm Up : It is possible to pull the paper from under a dry erase pen without touching or tipping the pen. Usually, however, the pen falls over. Why does the pen usually fall? How can one do this without tipping the pen? Why does that method work (sometimes)? Today:
Online Textbook (OpenStax) Reading: Homework:

Class
14 Monday,
10/9/17 Warm Up : No warmup today. Get ready to shoot. Today:
Online Textbook (OpenStax) Reading: Homework:

Class
13.5 Friday,
10/6/17 Warm Up : No warmup today Today:
Online Textbook (OpenStax) Reading: Homework:

Class
13 Thursday,
10/5/17 Warm Up : Can you guess the top 3 "hobbies/interests" of students in B3/4 and B5/6 Physics 200? Today:
Online Textbook (OpenStax) Reading: Homework:

Class
12.5 Wednesday,
10/4/17 Warm Up : 1) Based on the diagram to the right, provide definitions for precision and accuracy. 2) In the projectile contest your launcher must be able to fire projectiles at muzzle speeds between 6m/s and 10m/s. If your launcher has a maximum muzzle velocity of 11m/s, and your friend's has a maximum muzzle velocity of 20m/s, whose launcher is more precise? Why? 3) Describe the perfect rubber bands for this launcher competition. Today:
Online Textbook (OpenStax) Reading: Homework: 
Class
12 Tuesday,
10/3/17 Warm Up : At the angle shown, can the projectile launcher hit the target? If not, how should the launcher be adjusted? Today:
Online Textbook (OpenStax) Reading: Homework:

Class
11.5 Monday,
10/217 Warm Up : Suppose I want to find the time it takes for cannonballs to fall. I want fall times for all of the following heights: 40m, 44m, 46m... 80m? How could I create a spreadsheet that would quickly calculate all of these times? Today:
Online Textbook (OpenStax) Reading: Homework: 
Class
11 Friday,
9/29/17 Warm Up : The diagram on the right is hyperlinked comes from the Hyperphysics website. 1. To what conditions can the range formula be succesfully applied? 2. According to the formula, what value of θ gives the greatest range? 3. Take a look at what else is on that website. Today:
Online Textbook (OpenStax) Reading: Homework: 
Class
10.5 Thursday,
9/28/17 Warm Up : A projectile launcher is inclined at a 70 degree angle, relative to horizontal. It is pointed at a vertical wall a horizontal distance of 5m away from the muzzle. If the muzzle velocity of the projectile is 8m/s, how would you find the Δy will the projectile experience between leaving the launcher and hitting the wall? Today:
Online Textbook (OpenStax) Reading: Homework:

Class
10 Wednesday,
9/27/17 Warm Up : A green hunter and a blue hunter point their guns directly at a fake orange monkey and then fire simultaneously. Just as the two hunters fire their guns, the monkey slips and freefalls from the treetop. 1. How can we show, mathematically, that the blue hunter's projectile will hit the monkey? 2. Suppose you launch a projectile at an angle above horizontal. The projectile flies through the air and lands back at the starting height. Which velocity component would be most helpful in determining the projectile's time aloft  V_{x} or V_{y}? Why? 3. If you were to launch the same projectile at a different angle above horizontal. This time the projectile collides with a wall that is 4m from the starting point. In this case, which component of velocity would be most helpful in determining the time aloft? Why? Today:
Online Textbook (OpenStax) Reading: Homework:

Class
9.5 Tuesday,
9/26/17 Warm Up : A green hunter and a blue hunter point their guns directly at a fake orange monkey and then fire simultaneously. Just as the two hunters fire their guns, the monkey slips and freefalls from the treetop. 1. Where does each hunter's projectile end up, relative to the monkey? High, low, or in the monkey? 2. How would the result have been different if the monkey stayed in position at the top of the tree? 3. Do the answers to these questions depend on the bullet velocities? Today:
Online Textbook (OpenStax) Reading: Homework:

Class
9 Monday,
9/25/17 Warm Up : 1. What is happening to Vx and Vy at each moment in this photograph? 2. For each frame, how can we draw proportionally accurate Vx and Vy vectors on the diagram? 3. Consider the second diagram, below. How does the magnitude of the river's velocity affect the boat's crossing time?
Today:
Next Class: 2D Kinematics with acceleration. Online Textbook (OpenStax) Reading: Homework:

Class
8.5 Friday,
9/22/17 Warm Up : 1. What is the difference between ground speed and air speed? 2. Suppose you have a medium (such as water or air) that is moving with a certain velocity, relative to the Earth. Also suppose you have an object moving through that medium. The object has one velocity relative to the medium and a different velocity relative to the Earth. Of the three velocities that are highlighted, which one is most likely to be the resultant velocity in a physics problem? 3. Draw head to tail diagrams for these situations: a. V_{river}=3m/s South, V_{boat}=2m/s West, V_{boat relative to water }=? b. V_{plane air velocity} = 200m/s N, V_{wind}=50m/s E, V_{plane} =? c. V_{person on train}=20m/s W, V_{person relative to train}=4m/s S, V_{train} =? Today:
Online Textbook (OpenStax) Reading: Homework:

Class
8 Thursday,
9/21/17 Warm Up : 1. What are sine, cosine, and tangent? 2. Use trigonometry to find the missing vector magnitudes on the right. Today:
Online Textbook (OpenStax) Reading: Homework:

Class 7.5
Wednesday,
9/20/17 Warm Up : 1. Suppose the two vectors on the right represent two forces acting on the clam. In what direction will the clam accelerate? What will be the magnitude of the net force accelerating the clam in that direction? 2. The diagram on the right shows a top view of a train car that is moving at a rate of 2m/s. You are in the car. In which direction and how fast should you walk in order to have the intended velocity shown on the right. Today:
Online Textbook (OpenStax) Reading: Homework:

Class 7 Tuesday,
9/19/17 Warm Up : None Today: Test  1D Kinematics Online Textbook (OpenStax) Reading: Homework:

Class
6.5 Monday,
9/17/17 Warm Up : (Ignore air resistance for all questions) Suppose a plane is flying at a constant elevation of 500m and the pilot is trying to drop a bomb on a target on the ground. 1. Assuming g=10m/s^{2}, how long will it take the bombs to reach the ground? 2. If the plane is flying with a speed (relative to the ground) of 200m/s, how far in advance should be bomb be released? 3. For an observer watching the plane from our perspective, what is the shape of the bomb's flight path? 4. What is the bomb's acceleration in the X dimension? What about the Y dimension? Today:
Homework:

Class
6 Friday,
9/15/17 Warm Up: A race car is traveling counterclockwise around a circular track. The car's speedometer stays on exactly 100mph the whole time. Describe what happens to each of the following as the car makes one revolution around the track: a) the car's speed b) the car's velocity c) the car's acceleration.
Today:
Online Textbook (OpenStax) Reading: Homework:

Class
5.5 Thursday,
9/14/17 Warm Up: This potato cannon accelerates a potato with air compressed air. How much faster will the potato travel if the barrel is extended to twice the current length? Assume that there is no friction and that the air pressure pushing the potato is constant and equal in both cases. a. Same speed b. Faster, but not twice as fast c. Twice as fast d. More than twice as fast Today:
Online Textbook (OpenStax) Reading: Homework:

Class
5 Wednesday,
9/13/17 Warm Up: Sometimes people celebrate special occasions by firing guns into the air. 1. Is this ever a good way to celebrate? Explain. 2. What if the bullets were grapes? What about other healthy snacks? 3. What factors influence the terminal velocity of a bullet (or a snack)? Calculated terminal velocities of various spheres. Today:
Online Textbook (OpenStax) Reading: Homework: 
Class
4.5 Tuesday,
9/12/17 Warm Up: Suppose we strap a light source to a bike tire and then roll the tire to the right while taking a longexposure photograph through several rotations of the tire. 1. Describe the appearance of the photograph. 2. In the X dimension, what would graphs of position, velocity, and acceleration look like for the light source? Today:
Online Textbook (OpenStax) Reading: Homework:

Class
4 Monday,
9/11/17 Warm Up: Match each position vs. time graph with the correct velocity and acceleration graph. Today:
Online Textbook (OpenStax) Reading: Homework:

Class
3.5 Friday,
9/8/17 Warm Up: The symbol "g" usually represents the absolute value of the acceleration of gravity near Earth's surface. The approximatevalue of g is 9.8m/s^{2}, but for the following problem, assume it is 10m/s^{2}... Given g =10m/s^{2}, what would the velocity and acceleration graphs look like for an object that is initially flying directly upward at a speed of 20m/s? [Ignore air resistance.] Today:
Online Textbook (OpenStax) Reading: Homework:

Class
3 Thursday,
9/7/17 Warm Up: How can the video on the right be used to determine the acceleration of gravity? Today:
Online Textbook (OpenStax) Reading: Homework: 1. None. You will have today and tomorrow to work on this video analysis. It is possible that you may have to put in some time outside of class, so try to get the Logger Pro work done in class. Most students will have no problem accessing quicktime and Google Sheets at home, but you won't have Logger Pro. 
Class
2.5 Wednesday,
9/6/17 Warm Up: 1. For letter a, on the right describe what an object could be doing in order to have both positive velocity and positive acceleration. 2. Do the same for the rest of the letters. Today:
Online Textbook (OpenStax) Reading: Homework: 1. Find a way to measure/calculate/estimate the acceleration of gravity using this video. Try to find a solution that does not involve logger pro. With a little ingenuity, you can arrive at a decent answer from any computer with internet access. Remember that you can see greater detail if you download the video and watch it using Quicktime. Show your work and be prepared to show/explain your methods to the class. 2. Complete as much of the motion video scavenger hunt work as you can before next class. 
Class
2 Tuesday,
9/5/17 Warm Up: Assuming that the man in the picture is 2m tall, and the frame rate of the camera was 10frames per second, what were the approximate maximum and minimum speeds of the object? Today:
Online Textbook (OpenStax) Reading: Homework:

Class
1.5 Friday,
9/1/17 Warm Up:
A runner sprints exactly 100m, rests for a moment, and
then slowly follows the same path back to the starting line. This
entire trip takes 200s. For the questions below, consider
the runner's entire round trip. Today:
Online Textbook (OpenStax) Reading: Homework: 
Class
1 Thursday,
8/31/17 Warm Up: Each lettered curve on the right represents the position(s) of a person over a time span of 10 seconds. For this graph, position is the distance to the right of the origin (a.k.a. the zero meter mark) For each letter, describe the person's motion (or lack of it) during the 10 seconds represented on the graph.
Today:
Handouts: Online Textbook (OpenStax) Reading: Homework:

Class 0.5 Wednesday, 8/30/17 Physics 200: Mr. Stapleton Warm Up: Spin one of the "sprotating cylinders" by pressing one end until it squirts out from under your finger. Try pressing the other end. When the cylinder is spinning, why do you only see the symbol that you press? Today:
Handouts: Online Textbook (OpenStax) Reading: Homework:
