Lecture12

# Lecture12 - PHYSICS 149 Lecture 12 Chapter 4 4.4 Motion of...

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PHYSICS 149: Lecture 12 Chapter 4 – 4.4 Motion of Projectiles – 4.5 Apparent Weight – 4.6 Air Resistance Lecture 12 Purdue University, Physics 149 1

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Midterm Exam 1 Wednesday, February 23, 18:30 – 19:30 Place: PHY 333 Chapters 1 - 4 The exam is closed book. The exam is a multiple-choice test. There will be ~15 multiple-choice problems. maximum possible score will be 150 points. Note that total possible score for the course is 1,000 points (see the course syllabus) The difficulty level is about the same as the level of textbook problems. You may make a single crib sheet you may write on both sides of an 8.5” × 11.0” sheet Lecture 11 2 Purdue University, Physics 149
Lecture 12 Purdue University, Physics 149 3 You and a friend are standing on level ground, each holding identical baseballs. At exactly the same time, and from the same height, you drop your baseball without throwing it while your friend throws her baseball horizontally as hard as she can. Which ball hits the ground first? A) Your ball B) Your friends ball C) They both hit the ground at the same time ILQ 1 When ball hits depends on y only! y(t) = y 0 + v yo + ½ a y t Same for both balls! v 0y = 0 and y = 0 therefore t=sqrt(2y 0 /g) result is independent of v 0x

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Lecture 12 Purdue University, Physics 149 4 ILQ 2 Fred throws a ball 30 mph vertically upward and then catches it again at the same height he threw it from. What is the speed of the ball when he catches it? (Neglect air resistance) A) v < 30 mph B) v = 30 mph C) v > 30 mph v y 2 = v y0 2 - 2g(y-y 0 ) v y 2 = v y0 2