Lecture7_Ch7_8

# Lecture7_Ch7_8 - Chapter 7: Homework Chapters 7 & 8:...

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1 Chapters 7 & 8: Gravity Plan 1. Free Fall and Projectiles 2. The Universal Law of Gravitation 3. Gravitational Constant and Free-Fall Acceleration 4. Examples 5. Ocean Tides 5. Summary Chapter 7: Homework z Review Questions: 4, 5, 8, 9, 10,11, 19 z Exercises: 2, 6, 19 z Problems: 2, 3, 4 Chapter 8: Homework z Review Questions:1, 2, 4, 8 z Exercises: 3, 8, 16, 20 1. Free Fall and Projectiles Definition: A projectile is an object that moves under the influence of gravity. Examples: a tossed stone, a cannonball, a bullet, a ball,…,an athlete, a satellite, a spaceship, the moon, etc. The curve path of a projectile Example 1: Horizontally tossed stone The curve is the result of composite motion in two directions - horizontal and vertical This curve is called a parabola! V X Y

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2 A. Vertical direction Question: How much speed does the stone gain each second? Answer: 10 m/s Why a parabola? == =− 2 2 0 98 1 2 vertical Vg t , g . m / s Y(t) h gt h 0 B. Horizontal direction There is no force exerted on the stone in horizontal direction!
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## This note was uploaded on 05/27/2011 for the course PSC 1121 taught by Professor Khankasayev during the Fall '08 term at Florida A&M.

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Lecture7_Ch7_8 - Chapter 7: Homework Chapters 7 & 8:...

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