Tomorrow is my birthday. In honor of me turning 30 for the 11th time, lets all get the homework on elastic and inelastic collisions done for tomorrow, mmkay? If you're wondering, Mr. A loves Coke, kiwi fruit, Chick-fil-A, and airplanes. But more than material things, kind notes from the heart are a forever favorite. And Luna likes dolls, pink anything, apples, and trains.
- If you need support services, come see me, or any of your counselors. Room 143 should be open today all day.
ESSENTIAL QUESTION: Momentum - Is It Conserved?
Goals: SWBAT...
1. To solve momentum and momentum conservation problems
2. To determine if momentum is conserved during explosions
Warm-Up 87 (5min):
Consider a system with two carts. Cart 1 is moving to the right with a momentum of 120kgm/s & cart 2 is stationary. Both carts have a mass of 150kg each. The collide, stick together, and roll to the right.
1. What is the total final momentum after the collision?
2. Find the final velocity (post collision) of the carts.
Need help? Stuck? When you've gone as far as you can, here'a helpful video: http://www.youtube.com/watch?v=FitfUuwcfcI
CLASSWORK
1. #087A: Conservation of Momentum
Take notes, and answer edpuzzle questions
2. 087B: Momentum Practice Problems
Solve the following problems in your notebook.
LINK: https://drive.google.com/file/d/0B-AiPYEb3nFVMGRmVkt2ejAzbDQ/view
Some notes on yesterday's assignment...
3. #086A: Exploding Carts Interactive
- Your job was to choose a variety of mass combinations for the exploding carts, then look for patterns, and come up with relationships and an equation.
- Similar to the Fish Catch, today you'll be collecting data, looking for patterns, finding direct or inverse proportionality, and coming up with a rule (equation) to describe the carts behavior. To do that, you will analyze explosions which propel two stationary carts in opposite directions.
- Copy all data tables into your notes
- Collect data
- Answer all questions (1-9)
- Questions/Handout LINK: https://www.physicsclassroom.com/getattachment/Physics-Interactives/Momentum-and-Collisions/Exploding-Carts/Exploding-Carts-Activity/ExplodingCarts.pdf?ext=.pdf
- Interactive LINK: https://www.physicsclassroom.com/Physics-Interactives/Momentum-and-Collisions/Exploding-Carts/Exploding-Carts-Interactive
Learning at Home/HW
- Complete the CW from today
- Watch a video on elastic collisions, and take notes/answer edpuzzle questions.
Be sure to make the "Type of Collision" table in your notes
- Edpuzzle LINK: https://edpuzzle.com/media/58864a5f75bd5044d59d2273
ESSENTIAL QUESTION: Momentum - Is It Conserved?
Goals: SWBAT...
1. To determine if momentum is conserved during explosions
Warm-Up 87 (5min):
A 0.5-kg ball moving at 5 m/s strikes a wall and rebounds in the opposite direction with a speed of 2 m/s. If the impulse occurs for a time duration of 0.01 s, then the average force (magnitude only) acting upon the ball is ____ Newtons. Solve, then choose the correct answer below.
CLASSWORK
1. #087A: Exploding Carts Interactive
- Get your work signed by Mr. Garcia at the end of the period
- Similar to the Fish Catch, today you'll be collecting data, looking for patterns, finding direct or inverse proportionality, and coming up with a rule (equation) to describe the carts behavior. To do that, you will analyze explosions which propel two stationary carts in opposite directions.
- Copy all data tables into your notes
- Collect data
- Answer all questions (1-9)
- Questions/Handout LINK: https://www.physicsclassroom.com/getattachment/Physics-Interactives/Momentum-and-Collisions/Exploding-Carts/Exploding-Carts-Activity/ExplodingCarts.pdf?ext=.pdf
- Interactive LINK: https://www.physicsclassroom.com/Physics-Interactives/Momentum-and-Collisions/Exploding-Carts/Exploding-Carts-Interactive
If you didn't finish yesterday's classwork (reposted below), do so today
2. #086B: Momentum Conservation Practice Problems
When fighting fires, a firefighter must use great caution to hold a hose that emits large amounts of water at high speeds. Why would such a task be difficult?
A large truck and a Volkswagen have a head-on collision.
a. Which vehicle experiences the greatest force of impact?
b. Which vehicle experiences the greatest impulse?
c. Which vehicle experiences the greatest momentum change?
d. Which vehicle experiences the greatest acceleration?
If a ball is projected upward from the ground with ten units of momentum, what is the momentum of recoil of the Earth? ____________ Do we feel this? Explain.
If a 5-kg bowling ball is projected upward with a velocity of 2.0 m/s, then what is the recoil velocity of the Earth (mass = 6.0 x 1024 kg).
A 120 kg lineman moving west at 2 m/s tackles an 80 kg football fullback moving east at 8 m/s. After the collision, both players move east at 2 m/s. Draw a vector diagram in which the before- and after-collision momenta of each player is represented by a momentum vector. Label the magnitude of each momentum vector.
In an effort to exact the most severe capital punishment upon a rather unpopular prisoner, the execution team at the Dark Ages Penitentiary search for a bullet that is ten times as massive as the rifle itself. What type of individual would want to fire a rifle that holds a bullet that is ten times more massive than the rifle? Explain.
A baseball player holds a bat loosely and bunts a ball. Express your understanding of momentum conservation by filling in the tables below.
Learning at Home/HW
- Complete the CW from today
WARM-UP
State whether each sentence is true or false. If it is false, rewrite the sentence to make it correct/true.
Distance is a vector quantity and displacement is a scalar quantity.
A person makes a round-trip journey, finishing where she started. The displacement for the trip is 0 and the distance is some nonzero value
If a person walks in a straight line and never changes direction, then the distance and the displacement will have exactly the same magnitude.
CLASSWORK
Our semester final will be cumulative. Today is for you to revisit 1-dimensional kinematics. Answer the questions listed below, check your answers, and ask me any questions via the Remind App. This assignment is worth double points, and must be signed/initialed by your sub at the end of the day.
087A: Complete the following problems: 4bcgi; 5bde; 6ae, 7ae, 8, 11, 13, 15, 20, 21, 24, 25, 26, 28, 29, 31, 32, 43b, 48abcd, 50
Link to questions: LINK1
Link to check your answers: LINK2
ANNOUNCEMENTS
1. Friction Rods Activity is now due Monday
2. Complete the Handout on Electric Fields and Electric Field Lines (2 sides) (extra copies are on the seat next to my computer, or links to the handouts are on Day 86). Due Monday. Note: There will be a video posted here on Friday (LINK) covering how to complete the table in problem number 9.
3. Practice problems from Friday (today in class) are due Monday.
4. Extra Credit Opportunities: Due by Wednesday
A. 20 classwork points: Complete all four electric field charts correctly. Incorrect = zero points LINK
B. 10 homework points: Complete the Polarization activity (print out the handout, or recreate the drawing on a piece of paper) here: LINK
087B: HOMEWORK
1. Watch Mr. P's (Flipping Physics) video (in HD, so you can see the board) on Electric Potential Energy. Keep in mind, this is very similar to Gravitational Potential Energy, so look for connections between the two concepts. Answer the following questions while watching...(questions are in chronological order)
1. In terms of energy, what happens to the green medicine ball when Mr. P drops it?
2. In terms of energy, what happens to the positively charged tennis ball when Mr. P drops it?
3. Which force causes Gravitational Potential Energy? Which causes Electric Potential Energy?
4. List the four types of mechanical energy (keep in mind, what we called energy of a "spring", he calls "elastic". Same meaning though)
5. For Gravitational Potential Energy, we use the equation PEg=mgh, where h is the vertical height, because the gravitational field is vertical. For Electric Potential Energy, what equation do we use, and what is the special rule for the displacement?
6. Copy the derivation of the units for PEele along with Mr. P. What are the units for all energies (PEele included)?
Roni, you will be missed