PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 & 11165

1. PHY 2048CGeneral Physics I with labSpring 2011CRNs 11154, 11161 & 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 3-4, Chapter 4

2. Chapter 4 • Simple Projectile Motion • Circular motion • Centripetal Acceleration in Uniform Circular Motion • Rotational/Translational comparisons

3. Chapter 4 Practice Problems Chap 4: 7, 37, 47, 49, 61, 65 Unless otherwise indicated, all practice material is from the “Exercises and Problems” section at the end of the chapter. (Not “Questions.”)

4. 2-D Kinematics • The x and y components of the motion are treated separately. • Do not mix up x and y data when setting up and solving equations. • Good strategy: separate paper into “X” and “Y” columns. • Certain events can connect x and y motion at particular moments (certain t values).

5. 2-D Kinematics Equations General 2-D motion “Projectile” motion ay = -g, ax = 0

6. Example problem Chapter 4 #10 (p. 120)

7. Circular Motion • Radius is constant (or unimportant) • “Position” is an angle, in radians, θ • Velocity is radians per second, ω (that’s “omega”, not “curly double-u.”) • Acceleration can be along the tangent to the circle, at , or in a radial or “centripetal” direction, ac .

8. s θ

9. Example problem Chapter 4 #38 (p. 122)

10. Centripetal Acceleration

12. Example problem Chapter 4 #62 (p. 123)