DAY 78

#Goals: SWBAT...

1. ... review the components of "Power"

2. ... solve advanced work and power problems 

3. ... create and share graphs showing power output of a person climbing stairs

WARM-UP: 

Complete the following:

1. How many Joules in a kJ?

2. A forklift raises a box 1.5m and does 9.0kJ of work on it. What is the mass of the box? 

    a. Sketch the situation showing the forklift with initial conditions.

    b. Establish a coordinate system with up as positive.

    c. Draw a vector diagram for the force and displacement.

    d. Solve for Mass

CLASSWORK

1. Lab Work Time

    TASKS:

    0. Calculate and Fill-in a Typed Data Table  -  was due today for HW

    1. Divide the "Conclude", "Apply/Going Further", and "Real World Physics" questions so each member has a fair amount. Write the question assignments on your lab doc (example: Khylia does Real World 1-3 and Apply #1, Joe Average does conclusion and Apply #2, Barbie does the graphs, etc...)

    Lab Sections:

    Introduction (answer the main question by presenting your hypothesis)

    Data (data table and graphs go here)

    Analysis Section 

    - will be completed in parts. Each group member will answer one to four questions. Those will be turned in on the due date (Friday 05/05), and will be the responsibility of the group member to which they are assigned. 

    Conclusion (was your hypothesis correct?)    

End of day check:

    - Have you shared or emailed the data table and graphs to all group members?

    - Have you assigned questions/tasks?

NOTE: I received an excellent question about the lab, which I answered, and thought would be good to share with everyone:

Hi Joe Sixpack,

If you search for the following keywords: wattage common household appliances

you'll get some solid results. Here's one good one: https://www.consumerreports.org/cro/resources/images/video/wattage_calculator/wattage_calclulator.html

Let me know if you have any other questions :-)

Best,

Mr. A

From: Joe Sixpack

Sent: May 01, 2017 8:05 PM

To: Joshua Alexander

Subject: Help

Mr.Alexander, 

I need help on number one, on Real-World Physics. I just need help understanding what is it saying. A household item like a remote control or something else?

Thanks,

Joe Sixpack

P.7

2. Work Quiz

3. Review

4. Conservation of Energy - Chapter 11 will be our topic next class

HOMEWORK: 

Labs are due Friday.

Same with the Flipping Physics video questions below.

Watch: http://www.flippingphysics.com/intro-pee.html

1. Define Elastic Potential Energy

2. Write the equation for Elastic Potential Energy

3. What is a Spring Constant?

4. What is the state of the rubber band in it's equilibrium position.

5. What are the units of Elastic Potential Energy?

6. Can Elastic Potential Energy be negative?

and:

http://www.flippingphysics.com/intro-coe.html

7. List the three different types of mechanical energy

8. Mr. Terry drops a weight as a demo of COE. What type of energy does the weight have prior to falling? Right before it hits the ground?

9. When is mechanical energy conserved?

10. Near the end of the video, how does Mr. P demonstrate of conservation of mechanical energy?

and

1. Watch: http://www.flippingphysics.com/intro-ke.html

2. Is KE a vector or scalar? Can it be negative?

3. As you watch the video, take note and copy the solution for the example problem.

4. Why do we only need the speed (and not the velocity) of the bike or car to solve the problem? 

5. What mistake was (almost) made at around 3:30 of the video?

6. Solve a similar problem: Pedro is skateboarding at 4m/s. He has a mass of 55kg, and his skateboard has a mass of 3.0kg. His buddy Napoleon has a mass of 85kg. How fast must Napoleon run to have the same KE as Pedro?

pg 265: 15-18

I'm out sick today - your classwork is due in the turn-in slot by the end of the period. It's worth double points, and won't be accepted late, so stay focused, get it done, and turn it in. Have questions? Get your sub's permission first, then send me a text or give me a call. The sub has my phone number.

See you Wednesday... -A

#Goals: SWBAT...

1. ... use the Work-Energy Theorem to solve Work & Kinetic Energy problems

2. ... describe how the location of the zero (reference) line affects PEg

3. ... solve a gravitational potential energy problem

WARM-UP:

1. Write the equations for:

    Work:

    Kinetic Energy:

    Gravitational Potential Energy:

2. The KEi of a car is 250J, and the KEf is 197J.

    A. Write the Work-Energy Theorem (find it in your notes, or on the web, if necessary):

    B. Was positive or negative work done on the car? (hint, consider the Work-Energy Theorem from last class)

    C. Calculate the work done, in Joules

***FYI, I will be checking warm-ups #71-79 on Wednesday (05/11)

***Conservation of Energy Lab can be turned in today or Wednesday (you're welcome) for full credit.

Band concert Tues 05/10. 7PM. The PA. $5. Be there or be □  

CLASSWORK:

1. Practice Problems. Show all work. Sloppy work equals some points. No work equals no points ;-).

    Again, these are due at the end of the period.

pg 287 #2-3

pg 290 Example Problem #1. On your classwork paper, copy the Given & Unknown, make a quick Sketch (stick figures are fine), and copy the Solution.

pg 291 #4-8

pg 292 #10

Hints:

#4: The answer is negative

#5: Rihanna

#6 & 7: Set your zero(reference) line. You choose where it goes...

#8: think about the definitions, especially of work

#10: no hint necessary

HOMEWORK: 

Labs are due Today or Wednesday.

Same with the Flipping Physics video questions below.

Watch: http://www.flippingphysics.com/intro-pee.html

1. Define Elastic Potential Energy

2. Write the equation for Elastic Potential Energy

3. What is a Spring Constant?

4. What is the state of the rubber band in it's equilibrium position.

5. What are the units of Elastic Potential Energy?

6. Can Elastic Potential Energy be negative?

and:

http://www.flippingphysics.com/intro-coe.html

7. List the three different types of mechanical energy

8. Mr. Terry drops a weight as a demo of COE. What type of energy does the weight have prior to falling? Right before it hits the ground?

9. When is mechanical energy conserved?

10. Near the end of the video, how does Mr. P demonstrate of conservation of mechanical energy?

 - - - - - - - - - - - - - - - - - - - - - - -  - - - - - - - - - - - - - - - - - --

#74

#Goals: SWBAT...

1. ... review the components of "Power"

2. ... solve advanced work and power problems 

3. ... create and share graphs showing power output of a person climbing stairs

WARM-UP: pg 265: 15-18

Complete the following:

1. How many Joules in a kJ?

2. A forklift raises a box 1.5m and does 9.0kJ of work on it. What is the mass of the box? 

    a. Sketch the situation showing the forklift with initial conditions.

    b. Establish a coordinate system with up as positive.

    c. Draw a vector diagram for the force and displacement.

    d. Solve for Mass

#75

#Goals: SWBAT...

1. ... solve an advanced work problem

2. ... review concepts of KE and PE

3. ... collect data for Conservation of Energy Lab

WARM-UP: 

John pushes a crate across the floor of a factory with a horizontal force. The roughness of the floor changes, and John must exert a force of 20 N for 5 m, then 35 N for 12 m, and then 10 N for 8 m.

a. Draw a graph of force as a function of distance.

b. Find the work John does pushing the crate.

your data is due at the beginning of the period Friday.

1. Watch: http://www.flippingphysics.com/intro-ke.html

2. Is KE a vector or scalar? Can it be negative?

3. As you watch the video, take note and copy the solution for the example problem.

4. Why do we only need the speed (and not the velocity) of the bike or car to solve the problem? 

5. What mistake was (almost) made at around 3:30 of the video?

6. Solve a similar problem: Pedro is skateboarding at 4m/s. He has a mass of 55kg, and his skateboard has a mass of 3.0kg. His buddy Napoleon has a mass of 85kg. How fast must Napoleon run to have the same KE as Pedro?

NOTE: I received an excellent question about the lab, which I answered, and thought would be good to share with everyone:

Hi Joe Sixpack,

If you search for the following keywords: wattage common household appliances

you'll get some solid results. Here's one good one: https://www.consumerreports.org/cro/resources/images/video/wattage_calculator/wattage_calclulator.html

Let me know if you have any other questions :-)

Best,

Mr. A

From: Joe Sixpack

Sent: Wednesday, April 27, 2016 8:05 PM

To: Joshua Alexander

Subject: Help

Mr.Alexander, 

I need help on number one, on Real-World Physics. I just need help understanding what is it saying. A household item like a remote control or something else?

Thanks,

Joe Sixpack

P.7

#76

WARM-UP: 

Read the paragraph on pg 291 on Elastic Potential Energy. 

Elastic Potential Energy

When the string on the bow shown in Figure 11-7 is pulled, work is done on the bow, storing energy in it. Thus, the energy of the system increases. Identify the system as the bow, the arrow, and Earth. When the string and arrow are released, energy is changed into kinetic energy. The stored energy in the pulled string is called elastic potential energy, which is often stored in rubber balls, rubber bands, slingshots, and trampolines.

Energy also can be stored in the bending of an object. When stiff metal or bamboo poles were used in pole-vaulting, the poles did not bend easily. Little work was done on the poles, and consequently, the poles did not store much potential energy. Since flexible fiberglass poles were introduced, however, record pole-vaulting heights have soared.

Then solve #9 from page 292. See the example next to the whiteboard for help.

9. Elastic Potential Energy You get a spring-loaded toy pistol ready to fire by compressing the spring. The elastic potential energy of the spring pushes the rubber dart out of the pistol. You use the toy pistol to shoot the dart straight up. Draw bar graphs that describe the forms of energy present in the following instances.

a. The dart is pushed into the gun barrel, thereby compressing the spring.

b. The spring expands and the dart leaves the gun barrel after the trigger is pulled.

c. The dart reaches the top of its flight.

HOMEWORK: 

1. Watch: http://www.flippingphysics.com/intro-peg.html

A. Defining Gravitational Potential Energy

B. Where is Zero Line #1

C. Where is Zero Line #2

D. Where is Zero Line #3

E. Where are the typical locations of the zero line? List them all...

F. What are the units for Gravitational Potential Energy? Copy the calculation for how Mr. P determines the units...

#77

Gravitational Potential Energy (PEg)

#Goals: SWBAT...

1. ... state that energy changes from one form to another, and that the total amount of energy in a

        closed system remains constant.

2. ... describe how the location of the zero (reference) line affects PEg

3. ... solve a gravitational potential energy problem

WARM-UP: 

CH 11 pg 306: 29, 31, 33, 34, 35

FYI, I will be checking warm-ups #71-78 on Monday (05/09)

Band concert Tues 05/10. 7PM. The PA. $5. Be there or be □  

If you missed the Table of Friends from last class, copy it from a neighbor...

HOMEWORK: 

Labs are due Monday.

Also...

Watch: http://www.flippingphysics.com/intro-pee.html

1. Define Elastic Potential Energy

2. Write the equation for Elastic Potential Energy

3. What is a Spring Constant?

4. What is the state of the rubber band in it's equilibrium position.

5. What are the units of Elastic Potential Energy?

6. Can Elastic Potential Energy be negative?

and:

http://www.flippingphysics.com/intro-coe.html

7. List the three different types of mechanical energy

8. Mr. Terry drops a weight as a demo of COE. What type of energy does the weight have prior to falling? Right before it hits the ground?

9. When is mechanical energy conserved?

10. Near the end of the video, how does Mr. P demonstrate of conservation of mechanical energy?