Circular Motion Kinematics
Circular Motion
Kinematics
8.01
W04D1
Today¡¯s Reading Assignment:
MIT 8.01 Course Notes
Chapter 6 Circular Motion
Sections 6.1-6.2
Announcements
Math Review Week 4 Tuesday 9-11 pm in 26-152.
Next Reading Assignment (W04D2):
MIT 8.01 Course Notes
Chapter 9 Circular Motion Dynamics
Sections 9.1-9.2
Kinematics in Two-Dimensions:
Circular Motion
Polar Coordinate System
Coordinates (r,¦È )
Unit vectors
(r?, ¦È?)
Relation to Cartesian Coordinates
r = x2 + y2
r? = cos¦È i? + sin ¦È j?
¦È = tan ?1 ( y / x)
¦È? = ? sin ¦È i? + cos¦È j?
Coordinate Transformations
Transformations between unit vectors in polar coordinates
and Cartesian unit vectors
r?(t) = cos¦È (t) i? + sin ¦È (t) j?
¦È?(t) = ? sin ¦È (t) i? + cos¦È (t) j?
i? = cos¦È (t)r?(t) ? sin ¦È (t)¦È?(t)
j? = sin ¦È (t)r?(t) + cos¦È (t)¦È?(t)
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