Physics - Chapter 3.

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Presentation transcript:

Physics - Chapter 3

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

Demo - Projectiles - Predict result, why? Chapter 3

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

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

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

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

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

3-6 Solving Problems Involving Projectile Motion Chapter 3

Table 3-1 & 3-2 Equations Chapter 3

Example 3-3 through 3-8 Chapter 3

Skip 3-7 & 3-8 Chapter 3