ANGULAR KINETIC

Question 1

angular equivalent of newton first law

Answer 1

: The angular momentum of an object remains constant unless a net external torque is exerted on it

Question 2

the change of angular momentum is porportional to what and in the direction of

Answer 2

net external torque and in the direction of this external torque

Question 3

what happen if the external torque acting on an object do not sum 0

Answer 3

the object will experience an angular acceleration in the direction of the net torque. Its angular velocity will speed up or slow down, or its axis of rotation will change direction.

Question 4

. If an object’s angular velocity or axis of rotation changes what need to be acting on the object to cause the angular acceleration

Answer 4

net external torque

Question 5

the effect of the torque depent on what

Answer 5

moment of inertia of the object

Question 6

what is inertia

Answer 6

: resistance of a system to having its state of motion changed by application of a force.

Question 7

in linear kinetic inertia is what

Answer 7

mass, It is more difficult to speed up, slow down, or change the direction of a more massive object because it has more linear inertia

Question 8

in angular kinetic inertia is

Answer 8

moment of inertia

Question 9

moment of inertia depends on

Answer 9

mass, mass distribution, axis of rotation

Question 10

What factors affect the angular inertia of an object?

Answer 10

mass of an object and mass distribution relative to the axis of rotation

Question 11

can object have more than one angular inertia

Answer 11

yes

Question 12

The sum of all the particles’ resistances to rotation is the

Answer 12

total moment of inertia of the object

Question 13

what is a radius of gyration

Answer 13

length measurement that represents how far from the axis of rotation all of the object’s mass must be concentrated to create the same resistance to change in angular motion as the object had in its original shape.

Question 14

what is an eccentric axis

Answer 14

An eccentric axis is one that does not pass through the implement’s center of gravity

Question 15

if the mass of the implement is farther from the axis of rotation the moment of inertia increase or decrease

Answer 15

increase

Question 16

what is the most efficient way to move the human body

Answer 16

maximize acceleration while minimizing torque requirements.

Question 17

The longer radius of rotation of the striking surface of an implement causes a (larger/smaller) linear velocity at the striking end of the implement if the angular velocity is the same as the angular velocity of a shorter implement

Answer 17

larger

Question 18

conservation of angular moment is what

Answer 18

There can be no change in momentum without an externally applied force.

Question 19

linear momentum depend on what

Answer 19

velocity

Question 20

angular momentum for non rigid obkect depend on what

Answer 20

moment of inertia and angular velocity

Question 21

angular momentum for rigid objet depend on

Answer 21

only angular velocity

Question 22

increase in moment of inertia cause what in angular velocity to keep angular momentum constant

Answer 22

decrease angular velocity a

Question 23

since angular momentum always remain constant how can an athlete change their angular velocities

Answer 23

changing their moment of inertia

Question 24

can an rigid object have many different moment of inertia

Answer 24

yes bc it may have many axis but each axis only have one moment of inertia associated with it

Question 25

does a human moment of inertia about any axis is variable

Answer 25

yes, because human body are not rigid object

Question 26

is it possible to accelerate without applied a torque

Answer 26

yes by changing moment of inertia