# Shared Flashcard Set

## Details

Chapter 14
definitions and powerpoint overview
14
Biology
11/01/2011

Term
 What is moment of inertia?
Definition
 •the inertial property for rotating bodies • represents resistance to angular   acceleration • based on both mass and the distance   the mass is distributed from the   axis of rotation
Term
 ____is the sum of the products of each particle’s mass (m) and the radius of rotation (r) for that particle squared. I = Smr2
Definition
 moment of inerta
Term
 what is the radius of gyration?
Definition
 •distance from the axis of rotation to a   point where the body’s mass could   be concentrated without altering its   rotational characteristics • used as the index for mass distribution   for calculating moment of inertia: I = mk2
Term
 Knee angle affects the moment of inertia of the swinging leg with respect to the hip because of changes in the
Definition
 radius of gyration for the lower leg and foot.
Term
 what is angular momentum?
Definition
 •quantity of angular motion possessed   by a body • measured as the product of moment of   inertia and angular velocity:      H = Iw      H = mk2w
Term
 What is the principle of conservation of angular momentum?
Definition
 The total angular momentum of a given   system remains constant in the   absence of external torques.      H1 = H2    (mk2w)1 = (mk2w)2
Term
 When angular momentum is conserved, there is a tradeoff between
Definition
 moment of inerta and angular velocity
Term
 What produces change in angular momentum?
Definition
 angular impulse - the product of torque   and the time interval over which the   torque acts:     T t = DH             T t = (Iw)2 - (Iw)1
Term
 What are the angular equivalents of linear kinematic quantities?
Definition
 Linear         Angular        mass (m)                  moment of inertia (I = mk2) force (F)         torque (T = Fd ) momentum (M=mv)   angular momentum (H=mk2w) impulse (Ft)         angular impulse (Fd t)
Term
 What is the angular law of inertia?
Definition
 A rotating body will maintain a state of   rest or constant rotational motion   unless acted on by an external   torque that changes the state
Term
 What is the angular law of acceleration?
Definition
 A net torque causes angular acceleration of a body that is: • of a magnitude proportional to the   torque • in the direction of the torque • and inversely proportional to the   body’s moment of inertia
Term
 What is the angular law of acceleration
Definition
 T = Ia      T = mk2a
Term
 What is the angular law of reaction?
Definition
 • For every angular action, there is an   equal and opposite angular reaction. • When one body exerts a torque on a   second, the second body exerts a   reaction torque that is equal in   magnitude and opposite in direction   on the first body.
Term
 What is centripetal force?
Definition
 (force directed toward   the center of rotation   for a body in rotational   motion)       mv2      Fc =   r      Fc = mrw2
Supporting users have an ad free experience!