Chapter 14

Question 1

When knee flexion is increased, what happens to the moment of inertia of the leg about the hip?

Answer 1

remains the same

Question 2

What will happen to angular velocity, when a diver goes from a tuck position to a full layout position?

Answer 2

decrease

Question 3

What will happen to angular momentum when a diver goes from a tuck position to a full layout position?

Answer 3

remain the same

Question 4

Centripetal force produces what?

Answer 4

radial acceleration

Question 5

Angular Impulse

Answer 5

change in angular momentum equal to the product of Torque and time interval over which the torque acts.

Question 6

Angular momentum

Answer 6

quantity of angular motion possessed by a body; measured as the product of moment of inertia and angular velocity.

Question 7

Centripetal Force

Answer 7

force directed toward the center of rotation for a body for a body in rotational motion.

Question 8

Moment of inertia

Answer 8

inertial property for rotating bodies representing resistance to angular acceleration; based on both mass and the distance the mass is distributed from the axis of rotation.

Question 9

principal axes

Answer 9

three mutually perpendicular axes passing through the total body center of gravity.

Question 10

principle moment of inertia

Answer 10

total-body moment of inertia relative to one of the principal axes.

Question 11

radius of gyration

Answer 11

distance from the axis of rotation to a point where the body’s mass could be concentrated without altering its rotational characteristics.