Linear Kinematics
Sunday, February 22, 2015
9:21 PM
Acceleration = change in velocity/change in time
Linear motion: all points move the same distance, no ORIENTATION CHANGE
Angular motion: all points trace out arcs of a circle
Has center of rotation
Orien

Angular Kinetics Lecture
Monday, March 9, 2015
2:13 PM
Solving for muscle force
Use some torque equation
Change in torque = inertia * angualr velocity
Inertia = mass * radius gyration ^2
Mass is the mass of everything that is being accelerated
Joint react

Demo
Wednesday, March 4, 2015
2:13 PM
Drop landing
Phase 1: flight
Phase 2: impact down
ROM
o
Starts at 5- 15 degrees of knee flexion
o
End at 135 degrees
External Forces:
o
Ground reaction force
o
Gravity
o
Inertial prop
o
Soft tissue
Muscles involved
o

Angular Kinetics
Wednesday, March 11, 2015
1:17 PM
F=ma
T= Ia
Moment of inertia
Moment of inertia resist changes in angular velocity
Linear motion: only mass matter
Angular motion: mass and distribution
The further away mass is from axis of rotation the h

Motion occurs because forces cause it
Momentum
Total quality Includes mass and
Products of mass and velocity
L=mv
Conservation of momentum
Total momentum of a system of object is constat if the net external force acting on the system is
zero
Newtons 1st l

Rotational Kinematics lecture
Monday, March 2, 2015
2:08 PM
Degrees of freedom: one degree per a motion for each plane
Each plane you rotate in is a degree of freedom
Linear: each axis you can move about
Degrees of freedom could change depending on the po

Linear Kinetics in class lecture
Wednesday, February 25, 2015
2:13 PM
In a purely elastic colllision where moving object a impacts stationary object b what happens to object a
after the impact
Stops
In a purely elastic collision where moving objet a impac

Linear Kinematics in class lecture
Friday, February 20, 2015
2:10 PM
Central difference method
Motion is considered only iliner if the object doesnt change orientation
Acceleration is thte rate of change in velocity with respect to time
The peak of a vlec

DEMO - Angular Kinetics
Wednesday, March 11, 2015
2:11 PM
Skull crusher
Solve tricep force
Given
Weight = 45 lbs
Weight come to cor is 25cm
Forearm and hand com to cor = 10 cm
Arms vertical
Elpbw flex 120 degrees
Triceps pulling vertical
Triceps moment ar