Warm-Up! Tuesday, October 30, 2012.

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Presentation transcript:

Warm-Up! Tuesday, October 30, 2012

Today: Continue preparing for the test on Thursday. Go over previous assignments. Complete Chapter 5 review. If you were absent yesterday, you need to pick up the assignment.

Collected last Wednesday 3 points possible Collected last Wednesday

At this time, you will work on another review for the test covering Chapter 4 In order to prep you for Thursday’s test, you must complete this independently (please do not talk to your classmates until all reviews are complete). I WILL COLLECT TODAY! You are allowed to use your notes and textbooks. For # 15 of review, see bottom of pg. 30 in text. When done with review, use the time in class to study for Thursday’s test and work on portfolio and notebooks.

Write these in your notebooks... (use chapter 5) 1. Define the concept of terminal speed. 2. How does it affect falling objects that have different size, mass, etc.? 3. How does the air resistance and the weight of a falling object compare when terminal speed is reached? 4. How does this concept change how we've been discussing free fall on earth so far?

Answers to notebook questions: 1. Define the concept of terminal speed. The point at which a freely falling object stops accelerating downward and maintains a constant speed (acceleration stops; zero) because air resistance/friction balances the object's weight. 2. How does it affect falling objects that have different size, mass, etc.? These factors can affect the amount of friction and resistance, as well as the ratio between weight and air resistance due to area. (give examples) Coin vs. paper, etc. 3. How does the air resistance and the weight of a falling object compare when terminal speed is reached? Air resistance = weight; heavier objects have much higher terminal speeds. 4. How does this concept change how we've been discussing free fall on earth so far? Instead of the idea that a freely falling object will keep speeding up every second the entire time it is falling, we now know that the object will eventually reach a top speed and exceed that.