ch.14 terms

Question 1

angular impulse

Answer 1

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

Question 2

angular momentum

Answer 2

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

Question 3

centripetal force

Answer 3

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

Question 4

moment of inertia

Answer 4

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 5

principal axes

Answer 5

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

Question 6

principal moment of inertia

Answer 6

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

Question 7

radius of gyration

Answer 7

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

Question 8

T/F: if an object’s mass or angular velocity increases, its angular momentum decreases

Answer 8

false

Question 9

T/F: an extended body configuration produces greater angular velocity than a tuck position

Answer 9

false

Question 10

angular impulse is the product of __ and __

Answer 10

torque and time

Question 11

T/F: according to the principle of conservation of angular momentum, the total angular momentum of a given system remains constant in the absence of external torques

Answer 11

true

Question 12

T/F: when angular momentum is conserved, changes in the body configuration produce a trade-off between moment of inertia and angular velocity

Answer 12

true

Question 13

what variables contribute to the moment of inertia (I)?

Answer 13

mass (m) and radius of gyration (k)

Question 14

T/F: an angular impulse can be used to produce a change in angular momentum

Answer 14

true

Question 15

what is referred to as the “quantity of angular motion” possessed by a body?

Answer 15

angular momentum

Question 16

If a diver goes from a full layout position to a tuck position, what will happen to their angular velocity?

Answer 16

their angular velocity will increase

Question 17

Torque is the angular analogue of which linear quantity?

Answer 17

force

Question 17

Torque is the angular analogue of which linear quantity?

Answer 17

force

Question 18

what is a unit of I (I=moment of inertia)

Answer 18

kg*m^2

Question 19

in the angular analogues of newtons laws, what is the angular equivalent of mass?

Answer 19

moment of inertia

Question 20

T/F: the angular analogue of newtons 2nd law can be stated algebraically as T=Ia

Answer 20

true

Question 21

according to newtons angular law of acceleration, a net torque produces angular acceleration of a body that is:

Answer 21

1.) directly proportional to the magnitude of the torque
2.) inversely proportional to the body’s moment of inertia
3.) in the same direction as the torque

Question 22

what can be a unit of k (radius of gyration)

Answer 22

m

Question 23

torque can be calculated as T=Fd(perpendicular)

Answer 23

true

Question 24

the statement “a rotating body will remain a state of constant angular motion unless acted on by an external torque” refers to

Answer 24

newtons 1st law of inertia

Question 25

what is a symbol for angular momentum

Answer 25

H

Question 26

what is equivalent to T=Ia

Answer 26

Fd(perp)= mk^2a

Question 27

the statement “for every torque exerted by one body on another, there is an equal and opposite torque exerted by the 2nd body on the 1st” is the angular analogue of newtons 2nd law

Answer 27

false