Lecture 13

# Lecture 13 - Last Time Physics 231 General University...

This preview shows pages 1–3. Sign up to view the full content.

1 Physics 231 General University Physics Spring 2007 Lecture 13 Last Time ± Uniform Circular Motion ² Kinematics ² Dynamics ± Horizontal Circle Today ± Circular Motion ² Vertical Circle ± Non-Uniform Circular Motion ² Kinematics ² Dynamics HCM: Normal Force: Banked Curve [] [ ] 2 sin cos 0 tan rc zz v Fn m am r F n mg ma vr g θ Σ Σ ⎡⎤ == = ⎢⎥ ⎣⎦ = −= = = HCM: Banked Curve (Friction) ± Component of normal force contributes to centripetal force. ± Critical velocity v 0 for which no friction needed ± Friction directed uphill/downhill for speeds slower/faster than critical speed 0 g = Dynamics: Vertical Circular Motion ± Demo: Swing Tennis Balls in a Bucket ² Why don’t the tennis balls fall out?

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
2 VCM: Tension and Weight ± Demo: Swing Ball attached to Spring ² Notice length of spring at top versus bottom ² Size of tension ± Demo: Swing Ball attached to String ² Slow down until string collapses Problem: Swing a Ball on a String ± Suppose you swing a ball on a string 1m long in a vertically-oriented circle. Calculate the minimum
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 11/16/2010 for the course PHY 231 taught by Professor Ellis during the Spring '08 term at Kentucky.

### Page1 / 4

Lecture 13 - Last Time Physics 231 General University...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online