DAY 39

WARM-UP

1. Define the term "tension" as it relates to physics and forces

2. Draw a picture of a ball sitting on a table, which is in turn sitting on the Earth. 

3. Draw a FBD of the scenario. 

4. There are two Action/Reaction Pairs (AKA Interaction Pairs) in this scenario. Write the pairs below. 

5. From the HW notes (LINK-->NOTES), what do the symbols Fnh and Fhn stand for?     

    Which object does Fnh move?

CLASSWORK    

1. Pop-Quiz

A 3.0kg mass slides to the left 200.0cm along a flat surface and comes to rest in 1.0second. What is the net force acting on the mass as it slides along the surface?

2. Newton's 3rd Practice 

    If you completed the Newton's 3rd practice that I assigned for homework, come show it to me, and then do a bit more practice with the handout I have at my desk-->here's the LINK in case you're absent

HOMEWORK:

Complete Newton's 3rd Law Practice

Watch: https://edpuzzle.com/media/55cc7f8bb29432ce59c40761 and take notes

Watch: http://www.flippingphysics.com/third-law-misconception.html What is the common misconception?

Goals: SWBAT...

1. Define the Friction Force.

2. Distinguish between static and kinetic friction

3. Determine the components of the vectors

4. Find the friction (interaction) force between objects in the classroom. 

WARM-UP & HW CHECK (10 min)Due Tuesday: Read 5.2 (pg 126-130) - reading quiz. Do problems: 17, 22, 27, 31

1.What do the terms "static" and "kinetic" mean? Define them...

2. Take the laminated "Paxton Patterson" Activity Reference book off your desk, close it, and lay it on it's back. Use one finger only, and Gently try to slide it across your desk. Then answer the following: 

    A. Which required a greater force, getting the book moving, or keeping it moving?

    B. Think about the brief moment when you got the book moving - what happened     right then that you could use as evidence to prove your answer in "A" above. 

    C. What tool could you use to prove your answer?

CLASSWORK: (for each CW activity, think about which goal you are meeting. Also, tell me how the activity helps you achieve that goal)

1. Reading Quiz (5min)

2. HW Review (10min)

3. Hands On Activity: Finding Ff Static and Kinetic (30min)

    - You will be using the friction force and normal force to calculate the coefficient         of static friction for multiple tubs of varying masses. A larger coefficient indicates     a stronger friction force (AKA, a larger resistance to movement), and a                    

    smaller coefficient indicates a weaker friction force (AKA, a smaller resistance to 

    movement)

    - Which goal from above connects to this activity? 

    Instructions:

    1. Record the tub number and mass of your tub in kg

    2. Calibrate your spring scale to 0g.

    3. Set up your system. Attach the spring scale to the hole on your tub. Move the tub to the end of the table.

    4. Using the spring scale, apply a gentle pulling force to the tub. Record the maximum force you can apply WITHOUT the tub moving.

    5. Repeat number 4 above, except this time get the tub to move at the slowest possible CONSTANT VELOCITY. Record the force       

    applied during the constant velocity phase.

    6. Repeat steps 1-5 for a total of three tubs

    7. Once you have data for three tubs, find the normal force of each tub, then find the coefficient of kinetic friction for each tub. Use the example on pg 128 if you get stuck.

4. Connect activities with goals

HOMEWORK: 

Due Thursday: pg 128: 20, 21, 23 for extra credit. 

Complete Lab. Find uk

Issues? Print this and fill it out for zero extra credit

Hurt Feelings Report. LINK is high resolution: http://www.redonkulas.com/wp-content/uploads/2013/03/DA-FORM-IMTWF1.pdf