Daily Agenda for November 19 th and 20 th DO NOW: Please take out a pencil and paper and begin to copy the problem on the Projector Take your clicker from the front Tonight’s Homework: Finish POGIL Spring Scales (this will be handed in and graded!) Ch4. Review Problems #’s 9, 10, 12, 17, 19, 20, 25, 30, 36, 37 For these problems, write enough information so you may reference it for a quiz!

What’s the BIG idea? What is the difference between Mass, Weight, and Volume? Quantity of how much matter is in an object. Units: g, kg, mg, etc. Measurement of force of gravity acting on an object. Units: pounds (lbs) Newtons (N) How much space an object takes up. Units: cubic cm, Liters (L), cubic meters

If I stood on a regular bathroom scale in outer space (aka weightless environment), what would the scale read? A. More than my weight on earth B. Less than my weight on earth C. My weight on earth D. Zero E. Not sure

What’s the BIG idea? If I stood on a regular bathroom scale in outer space (aka weightless environment), what would the scale read?

Does location affect my WEIGHT? A. YES B. NO C. Not sure

Does location affect my MASS? A. YES B. NO C. Not sure

Fnormal Fgravity F normal= F Gravity Mechanical and Static Equilibrium

Mechanical Equilibrium ( ME) Is when…  The object is not changing its state of motion…  so the object is not accelerating…  and the net force on an object is zero. And there are 2 types of it… Static Equilibrium If it is at rest.  What does this mean? o Zero velocity o Zero acceleration Dynamic Equilibrium If it is moving in a STRAIGHT LINE at a CONSTANT SPEED.  What does this mean? o Constant velocity o Zero acceleration

Homework Review For the Next 8 minutes, work with others to review homework. IF YOU DID NOT COMPLETE THE HOMEWORK, PLEASE DO IT NOW.

Quiz Review You have 5 minutes to review answers to this quiz with classmates. Feel free to move locations. YOU MUST review, make corrections, and be able to explain to the Teacher why you were correct/incorrect and what the right answer is. We will be around to check on your understanding! Answers: 1.A6.B4. D 2.A7.A5. B 3.A1. C6. B 4.B2. C7. B 5.A3. C

What is tension? On a piece of paper, write the following: your own definition of the word “tension” Examples of “tension” in real life. Have at least three written down!

Examples of Tension!

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POGIL- Tension Work in groups of 4-5 You may work at a lab bench, but make sure you are able to see the projector Work efficiently on these problems! Whatever is not finished becomes homework! At each check in with a teacher. DO NOT GO AHEAD UNTIL YOU HAVE DONE SO. Complete at least up until #11

Materials for POGIL Materials Manager is responsible to return all the following items to the box: ◦ g mass (black) ◦ 1 Piece of String ◦ 2 Spring Scales ◦ 1 Ruler hands scale ruler hook Mass

Exit Slips! Take an exit slip and SILENTLY write your answers (THREE questions!) Then, we will review answers on Powerpoint. When the answer comes up, you will MAKE YOUR CORRECTIONS in a different color (or, circle them, etc…do something to make them stand out to me!) These are not graded, so it’s ok if you make corrections BUT YOU MUST COMPLETE THEM! To be turned in when done. These will be returned to you next class.

think! Suppose you stand on two bathroom scales with your weight evenly distributed between the two scales. What is the reading on each of the scales? What happens when you stand with more of your weight on one foot than the other? 2.3 Support Force

think! Suppose you stand on two bathroom scales with your weight evenly distributed between the two scales. What is the reading on each of the scales? What happens when you stand with more of your weight on one foot than the other? Answer: In the first case, the reading on each scale is half your weight. In the second case, if you lean more on one scale than the other, more than half your weight will be read on that scale but less than half on the other. The total support force adds up to your weight. 2.3 Support Force

think! Two sets of swings are shown at right. If the children on the swings are of equal weights, the ropes of which swing are more likely to break? 2.5 Vectors

think! Two sets of swings are shown at right. If the children on the swings are of equal weights, the ropes of which swing are more likely to break? Answer: The tension is greater in the ropes hanging at an angle. The angled ropes are more likely to break than the vertical ropes. 2.5 Vectors

think! In your own words, please describe why it is more difficult to do pull-ups with one arm, instead of 2. Include key terms we have used today. 2.5 Vectors

TONIGHT’s Homework Finish POGIL Spring Scales (this will be handed in and graded!) Ch4. Review Problems #’s 9, 10, 12, 17, 19, 20, 25, 30, 36, 37 For these problems, write enough information so you may reference it for a quiz!