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

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

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

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PHY 2048CGeneral Physics I with labSpring 2011CRNs 11154, 11161 & 11165

Dr. Derrick Boucher

Assoc. Prof. of Physics

Session 3-4, Chapter 4

Chapter 4

- Simple Projectile Motion
- Circular motion
- Centripetal Acceleration in Uniform Circular Motion
- Rotational/Translational comparisons

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.”)

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).

2-D Kinematics Equations

General 2-D motion

“Projectile” motion

ay = -g, ax = 0

Example problem

Chapter 4 #10 (p. 120)

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 .

s

θ

Example problem

Chapter 4 #38 (p. 122)

Centripetal Acceleration

Example problem

Chapter 4 #62 (p. 123)