Pace, Pressure, Rhythm, Flails, Delivery Paths, Acceleration and Pulley Sizes

[annikan skywalker]

You got the gist....

Reread definitions ....Angular Velocity/Angular acceleration vvery related to RPM's if not just looking through another pair of spectacles...


No low pitches....just curves balls that start at the head and end in the dirt...but then again ...watch out for the hard "high and tighty"

[Bagger Lance]

watch out for the hard "high and tighty"

mmmkay - I'll do my homework because I have do have my decoder ring and the message is loud and clear.

Watch out for wedgies.

[annikan skywalker]

mmmkay - I'll do my homework because I have do have my decoder ring and the message is loud and clear.

Watch out for wedgies.

Homework Assignment #1 - Research Angular Kinematics...You can use Wiki Tiki if you like or "Biomechanics of Sports and Excercise" by Peter M. McGinnis...Make sure to turn to page 153 and read the definition of angular velocity...Hint...PBH beat you to it!!!


http://en.wikipedia.org/wiki/Kinematics




Rotational motion

The angular velocity vector points up for counterclockwise rotation and down for clockwise rotation, as specified by the right-hand rule.Rotational motion is the description of the turning of an object and involves the following three quantities, as do linear motion:

Angular displacement: Angular position θ is the angle that a line from the axis of rotation to a point on an object makes with respect to the positive x-axis, which is measured counterclockwise.

Angular velocity: The magnitude of the angular velocity ω is the rate at which the angular position θ changes with respect to time t:


Angular acceleration: The magnitude of the angular acceleration α is the rate at which the angular velocity ω changes with respect to time t:

[Bagger Lance]

Homework Assignment #1 - Research Angular Kinematics...You can use Wiki Tiki if you like or "Biomechanics of Sports and Excercise" by Peter M. McGinnis...Make sure to turn to page 153 and read the definition of angular velocity...

I promise to do the homework, but this sure feels like punishment for abusing your N.C. buddy.

Do you promise light bulbs are gunna start pop'in like John Coffey made em in The Green Mile?

Or are you leading me down the hallway to visit "ole sparky"?
I gotsta know boss.

[BerntR]

1) Angle: (Here) the angle between the golf shaft at the moment and some vector on the inclined plane.
2) Angular velocity: The change rate of angle
3) Angular acceleration: The change rate of angular velocity.

[PBH]

Some relations of surface speed and RPM.

Approximation -> Let's say that a point "P" in the middle of the the shoulders are the center of
all rotation.

Use "RPM" as the basic RPM of the pivot.

Left shoulder (surface) speed = (2 * radius1 * pi * RPM)*60, radius1 = P->left shoulder, unit = m/s.
Hand (surface) speed = (2 * radius2 * pi * RPM)*60 + hand overtaking speed, radius2 = P->hands, unit = m/s.
Clubhead (surface) speed = (2 * radius3 * pi * RPM)*60 + hand overtaking speed + clubhead overtaking speed,
radius3 = P->clubhead, unit = m/s.

Note: radius1 is constant, radius2 increases sligthly in downswing, radius3 increases more.

Another way to see it(but less usefull) would be that left shoulder, hands and clubhead have different RPMs.

[PBH]

You got the gist....

Reread definitions ....Angular Velocity/Angular acceleration vvery related to RPM's if not just looking through another pair of spectacles...


No low pitches....just curves balls that start at the head and end in the dirt...but then again ...watch out for the hard "high and tighty"

Angular Velocity and RPM are different definitions of the same thing.

Surface speed = Angular velocity * radius, the unit is m/s
Surface speed = (2 * radius * pi * RPM)*60, the unit is m/s

[annikan skywalker]

I could stand for correction:

BUT ...

Arc Velocity is a measurement along the circumferece(travel distance)
Angular Velocity is a measurement around an axis of rotation(instantaneous centers)


I will go through my notes from class (ExSC 570 - Biomechanics for Educators - Dr. Brian Bergeman here at Campbell University) to see if I'm correct and will post them later