Physics - Chapter 3

1. Physics - Chapter 3

2. Section 3-5 Projectile Motion • Chapter 2 - Motion in one direction X or Y • Projectile Motion - Motion in two directions X & Y • Examples - golf ball, thrown baseball, kicked football, speeding bullet, long jump • Air resistance - ignored in calculations, is often important • Problems deal with objects after they are moving freely in the air Chapter 3

3. Demo - Projectiles - Predict result, why? Chapter 3

4. Projectile Motion (cont.) • Galileo - Analyze horizontal and vertical motion separately Chapter 3

5. Overheads - Projectile Motion velocity & acceleration 3-18, 3-20 Chapter 3

6. Y Direction (Y component) • Acceleration is constant a = g = -9.8 m/s2 • Velocity changes with time due to g. • If dropped v increases. • If projected at upward angle, v decreases and becomes negative. Chapter 3

7. X Direction ( X component) • Acceleration is zero • Velocity remains constant, equal to initial value Chapter 3

8. Galileo - An object projected horizontally will reach the ground in the same time as an object dropped vertically. The vertical motions are the same in both cases. Chapter 3

9. 3-6 Solving Problems Involving Projectile Motion Chapter 3

10. Table 3-1 & 3-2 Equations Chapter 3

11. Example 3-3 through 3-8 Chapter 3

12. Skip 3-7 & 3-8 Chapter 3