quiz 2

Question 1

where does rotation occurs

Answer 1

around center of gravity

Question 2

what is the name of the turning effected produced by a force

Answer 2

a torque

Question 3

torque depend on

Answer 3

magnitude of external force applies + moment arm

Question 4

what is a moment arm

Answer 4

distance btw axis of rotation and the line of action of the applied force

Question 5

what is a centric force + what does it produce

Answer 5

An external force applied directly to the center of gravity + change in linear motion

Question 6

what is a eccentric force + what does it produce

Answer 6

An external force not directly applied directly through the center of gravity + produce change in linear motion and angular motion

Question 7

if my moment arm is smaller what does it do to the torque for a same force applied

Answer 7

the torque will be smaller for a same force applied

Question 8

counterwise rotation = positive or negative

Answer 8

positive

Question 9

if the net force = 0 will there be a change in linear motion

Answer 9

no, only angular motion

Question 10

what do we need to have if we want to ensure that there is no angular motion

Answer 10

a net torque= 0

Question 11

if we want an object to be in static equilibrium what do we need

Answer 11

net torque + force = 0

Question 12

define center of gravity

Answer 12

point around which all torque sum = 0

Question 13

what is the angular positon

Answer 13

distance from origin (radius) and angle form btw reference axis and line formed by connecting the point to the origin

Question 14

what is relative angular position

Answer 14

the reference axis can move

Question 15

what is absolute angular position

Answer 15

reference axis can’t move

Question 16

what is angular displacement

Answer 16

change in angular position

Question 17

all point on the line is angularly displace _ but linear displacement depends on _

Answer 17

same amount
radius

Question 18

curvilinear displacement is proportional to _ and depend on

Answer 18

angular displacement and depend on how fare away the point is from the axis of rotation

Question 19

what is angular velocity

Answer 19

rate of change of angular displacement

Question 20

angular velocity varie throughout

Answer 20

change in angular position

Question 21

what is tangential linear velocity

Answer 21

linear velocity of a point on a rotating segment

Question 22

tangential linear velocity depend on

Answer 22

how fast a point move depends on how far that point is from the axis of rotation

Question 23

what is angular acceleration

Answer 23

change in magnitude and/or direction of the angular velocity with respect to time

Question 24

angular acceleration vary throughout

Answer 24

change in angular position

Question 25

what tangential linear acceleration

Answer 25

linear acceleration tangent to the circular path of a point on a rotating object

Question 26

what is centripetal acceleration

Answer 26

linear acceleration directed toward the axis of rotation. Caused by change in direction of the velocity vector

Question 27

with a smaller radius do we need more or less force to throw an object at the same distance

Answer 27

more

Question 28

if angular velocity doesn't change what does it means

Answer 28

no acceleration and no torque applied

Question 29

what is inertia

Answer 29

resistance of a system to have its state of motion change by a force

Question 30

inertia depend on

Answer 30

mass, mass distribution, axis of rotation

Question 31

what is radius of gyration

Answer 31

distance that represent how far the mass is from an axis of rotation if its mass were concentrated at one point

Question 32

angular acceleration is _proportional to the net torque and _ proportional to rotational inertia

Answer 32

directly, inversely

Question 33

what is the most efficient way to move a body

Answer 33

maximize acceleration and minimize torque (decrease moment of inertia)

Question 34

will they be a change in momentum without an force externally applied

Answer 34

no

Question 35

what happened when we manipulated moment of inertia

Answer 35

change in angular velocity

Question 36

what is angular impulse

Answer 36

product of applied torque and interval of torque application