6834 Lecture Notes - Lecture 7: Kinematics, Angular Momentum, Angular Velocity

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Week 7: angular kinetics
- Angular kinetics
oSimilar comparison between linear and angular kinematics
- What is moment of inertia
oMoment of inertia
Depends on the distribution of the mass around the axis (radius of rotation)
I=mr2
Where:
M = mass
R = radius of rotation
SI unit = kg.m2
Bat B easier to rotate because mass closer to wrist
- whole body MOI
oconsider human movement to occur about 3 principal axes
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oeach principal axis has a principal moment of inertia associated with it
owhen mass is distributed closer to the axis the moment of inertia is lower
o
- Advantage of knee flexion
o
Someone running
oI=mr2
o75kg female athlete
Shank % of BM = 4.3%
Shank mass = 3.225kg
Thigh % of BM = 14.2%
Thigh mass = 10.65kg
Foot % of BM = 1.4%
Foot mass = 1.05kg
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