Lecture 27

Lecture 27 - Last Meeting Physics 231 General University...

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

View Full Document Right Arrow Icon
1 Physics 231 General University Physics Lecture 27 Lecture 9 1 Last Meeting ± Torque ² Rotational Analog of Force Lecture 9 2 Today ± Angular Momentum ² Definition ² Relation to Torque ² Precession Lecture 9 3 Angular Velocity is a Vector ± ω is the magnitude of a vector ± The direction of the vector specifies the axis of rotation ± Two-fold ambiguity resolved by using “Right-Hand Rule” Lecture 9 4 Quiz: A ladybug sits at the outer edge of a merry-go- round that is turning and is slowing down. The vector expressing her angular velocity is in the […] direction . 1. +x 2. -x 3. +y 4. -y 5. +z 6. -z +x -x +y -y + z -z 2% 4% 5% 75% 2% 11% Lecture 9 5 Angular Momentum: Motivation L= I ω ? P=mv L ? p ω v I m Translation Rotation
Background image of page 1

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

View Full DocumentRight Arrow Icon
2 Lecture 9 6 Lecture 9 7 The Vector Product ± There are instances where the product of two vectors is another vector ² Earlier we saw where the product of two vectors was a scalar ± This was called the dot product ± The vector product of two vectors is also called the cross product Lecture 9 8 Lecture 9 9 The Vector (Cross) Product ± The quantity AB sin θ is equal to the area of the parallelogram formed by A and B ± The direction of C is perpendicular to the plane formed by A and B ± Determine this direction by using the “right-hand rule” Lecture 9 10 The Vector Product and Torque ± The torque vector lies in a direction perpendicular to the plane formed by the position vector and the force vector ± τ = r x F ±
Background image of page 2
Image of page 3
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 / 6

Lecture 27 - Last Meeting Physics 231 General University...

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

View Full Document Right Arrow Icon
Ask a homework question - tutors are online