Angular Kinetics Newton's Laws Flashcards
Moment of inertia
I
Is the moment of inertia a scalar or vector?
Scalar
How does the distance of mass from the axis of rotation impact inertia?
Further from mass=more inertia
Closer to mass=less inertia
How does choking up on the bat affect the swing?
Makes it easier to swing since you are closer to the mass
More mass towards the proximal ends vs distal benefits what?
Statically in Wr
Dynamically in Ia
Uniform angular motion
Angular momentum stays constant
What can alter velocity when there is no external torque?
Changing moment of inertia
What stays constant in Newton’s second law related to angular kinetics?
I (moment of inertia)
What does it mean if torque or force is a negative?
Opposite direction as drawn
Inertia torque product
I*a
What is a generalized FBD?
Multiple individual forces merge into a single force/torque about an axis
Joint reaction force
The resultant force added to the bone force at location where segmentation occurs
What type of activation is the bicep curl under quasi static conditions?
Uni-phasic activation
Quasi-static conditions
Acceleration=0
How does the net muscular moment change as you perform a bicep curl?
Increases to half-way then decreases
Most torque halfway
How does NNMe change when a bicep curl is performed slow and controlled?
Increases then decreases UP
Decreases then increases DOWN
Need a big force to get it going and to stop the last rep
How does NNMe change when a bicep curl is performed ballistically?
Extensors needed to regulate stopping the rep UP
Flexors needed to regulate stopping the rep DOWN
