Chapter 3 youtubes:
Statics Lecture 10: What is moment of a force?
https://www.youtube.com/watch?v=pSK1h1Aylsk
Statics Lecture 11: Moment calculation scalar formulation
https://www.youtube.com/watch?v=_xBHygW70tE
Statics Lecture 12: Moment calculation vector formulation
https://www.youtube.com/watch?v=Lg3P4uIlgeU
Statics Lecture 13: Moment about a specified axis
https://www.youtube.com/watch?v=wfhYXm0l6BY
Statics Lecture 14: Principle of moments
https://www.youtube.com/watch?v=i7g2x8dn87Q
Rigid Bodies vs. Particle
Particle Problems: Forces act through a point
Rigid Body Problems: Have to worry about moments
3 Different types of moments:
•moment of a force about a point
•moment of a force about an axis
•moment due to a couple
Any system of forces acting on a rigid body can be replaced by an equivalent system consisting of one force acting at a given point and one couple.
What is a "moment of a force"?*************
Any force that is applied to a rigid body causes the body to translate or rotate or both.
• The tendency to ROTATE is caused by MOMENTS generated by the force.
.
In general, a force F generates a moment about any point O which is offset by some distance from the line of action of F.
http://en.wikipedia.org/wiki/Cross_product
Notes from book:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
No comments:
Post a Comment