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# Wednesday 11-22-06

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### Transcript

• 1. November 22, 2006 <ul><li>Objective: </li></ul><ul><ul><li>SWBAT map test objectives. </li></ul></ul><ul><ul><li>SWBAT explain how things rise when baking. </li></ul></ul><ul><li>A-Team: </li></ul><ul><li>Homework: Bring 5 written examples of everyday science you observe during the holiday. </li></ul><ul><li>Catalyst: Who is eligible to re-take the test to improve his/her score? </li></ul>
• 2. Catalyst <ul><li>Q: Who is eligible to re-take the test to improve his/her score? </li></ul><ul><li>A: Everyone </li></ul>
• 3. Mapping test objectives <ul><li>Ideally, every question matches up with an objective </li></ul><ul><li>No one test is perfect or a perfect measure of your understanding </li></ul><ul><li>Today, we will break it down and compile the data. </li></ul><ul><li>You can see exactly what info you need to work on. </li></ul>
• 4. Question Map <ul><li>Describe gravity as an attractive force among all objects. (2.2.B.a) </li></ul><ul><ul><li>1-5 (5) </li></ul></ul><ul><li>Compare and describe the gravitational forces between two objects in terms of their masses and the distance between them (2.2.B.b) </li></ul><ul><ul><li>6-7 (2) </li></ul></ul><ul><li>Describe weight in terms of the force of a planet’s or moon’s gravity acting on a given mass (2.2.B.c) </li></ul><ul><ul><li>8-11 (3) </li></ul></ul><ul><li>Recognize that all free-falling bodies accelerate at the same rate due to gravity regardless of their mass (2.2.B.d) </li></ul><ul><ul><li>Oops (4) (retest) </li></ul></ul><ul><li>Describe the effect of work on an object’s kinetic and potential energy. (1.2.B.d) </li></ul><ul><ul><li>12 (1) </li></ul></ul>
• 5. Question Map <ul><li>Describe the relationships between work, applied net force and the distance an object moves (2.2.F.a) </li></ul><ul><ul><li>13-17 (5) </li></ul></ul><ul><li>Describe power in terms of work and time (2.2.F.c) </li></ul><ul><ul><li>18-20 (3) </li></ul></ul><ul><li>Relate an object’s gravitational potential energy to its weight and height relative to the surface of the Earth (1.2.B.b) </li></ul><ul><ul><li>22-24 (3) </li></ul></ul><ul><li>Relate kinetic energy to an object’s mass and its velocity (1.2.B.a) </li></ul><ul><ul><li>25-28 (4) </li></ul></ul><ul><li>Distinguish between examples of kinetic and potential energy (i.e. gravitational, elastic) within a system. (1.2.B.c) </li></ul><ul><ul><li>29-32 (4) </li></ul></ul><ul><li>Describe the transformations that occur as energy changes from kinetic to potential within a system (i.e. car moving on rollercoaster track, a bouncing ball). (1.2.F.a) </li></ul><ul><ul><li>33-40 (8) </li></ul></ul><ul><li>Orphans </li></ul><ul><ul><li>21 (1) </li></ul></ul>
• 6. How to do your tracking <ul><li>Look at each objective number on the next slide. </li></ul><ul><li>Count the number right divided by the number wrong </li></ul><ul><li>Enter on tracking sheet. </li></ul><ul><li>Compute percentage </li></ul>
• 7. Example <ul><li>Objective 1 will be listed as </li></ul><ul><ul><li>“1. 1-5 (5)” </li></ul></ul><ul><li>This means you’re looking at questions 1-5 </li></ul><ul><li>Your total number of questions is out of five </li></ul><ul><li>On your sheet, you might write </li></ul><ul><ul><li>“4/5 = 80%” </li></ul></ul>
• 8. Track onward <ul><li>1-5 (5) </li></ul><ul><li>6-7 (2) </li></ul><ul><li>8-11 (3) </li></ul><ul><li>12 (1) </li></ul><ul><li>13-17 (5) </li></ul><ul><li>18-20 (3) </li></ul><ul><li>22-24 (3) </li></ul><ul><li>25-28 (4) </li></ul><ul><li>29-32 (4) </li></ul><ul><li>33-40 (8) </li></ul><ul><li>21 (1) </li></ul>Scales: 1/5 = 20 2/5 = 40 3/5 = 60 4/5 = 80 1/3 = 33 2/3 = 66 1/2 = 50 1/4 = 25 2/4 = 50 3/4 = 75 1/8 = 12.5 2/8 = 25 3/8 = 37.5 4/8 = 50 5/8 = 62.5 6/8 = 75 7/8 = 87.5
• 9. A bit about baking <ul><li>When we bake, what do we want to happen? </li></ul><ul><ul><li>Things should RISE </li></ul></ul><ul><li>Bread rising, cookies plumping, cakes fluffing is not by accident… it’s by science </li></ul><ul><li>The secret weapon: carbon dioxide </li></ul>
• 10. First Way: Yeast <ul><li>Yeast is a fungus </li></ul><ul><ul><li>Fungus is like mushrooms </li></ul></ul><ul><li>Yeast, when put with water, “wakes up” </li></ul><ul><li>It likes to “eat” sugar. When it does, it releases carbon dioxide and alcohol </li></ul><ul><li>The alcohol can evaporate when baking </li></ul><ul><ul><li>The bitterness makes it great for bread </li></ul></ul><ul><li>SLOW!! </li></ul>
• 11. Way 2: Baking powder <ul><li>It’s a magical mixture of 3 things </li></ul><ul><ul><li>An acid : cream of tartar </li></ul></ul><ul><ul><li>A base : baking soda </li></ul></ul><ul><ul><li>Some filler (to soak up some water) : cornstarch </li></ul></ul><ul><li>When put with water, it reacts pronto. No, really. </li></ul><ul><li>It’s why we mix dry ingredients last </li></ul><ul><li>Produces carbon dioxide! </li></ul><ul><li>Can make things bitter </li></ul><ul><li>Instant. </li></ul>
• 12. Way 3: Baking soda <ul><li>Arm and Hammer is our friend </li></ul><ul><li>It’s a base… likes to react with acidic foods like vinegar, citrus juice, sour cream, yogurt, buttermilk, chocolate, cocoa, honey, molasses, fruits and maple syrup </li></ul><ul><li>Less bitter effect. Could taste “soapy” </li></ul><ul><li>Fast acting. </li></ul>
• 13. Just to note… <ul><li>Extra credit reading: </li></ul><ul><ul><li>“The Physics of Christmas” </li></ul></ul><ul><li>Read any part of any chapter and write a summary. </li></ul><ul><li>Due before winter break. </li></ul><ul><li>I’ll have a copy for “after school” starting next week. </li></ul>