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Biomechanics > ANgular kinetics > Flashcards

ANgular kinetics Flashcards

1
Q

What is angualr kinetics?

A

causes of angular motion

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2
Q

WHat is angular (rotary inertia). QUnatified as?

A

– property of an object to resist changes in its angular motion.
- moment of inertia (I)

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3
Q

is moment of inertia scalar or vector?

A

scalar

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4
Q

what is SI unit for moment of inertia

A

kg x m^2

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5
Q

What is the ri in the moment of inertia equation

A

radius frolm particle i to axis of rotation a

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6
Q

what is the radius of gyration?

A

the distance from the axis of rotation to the point at which an objects mass could be concentrated without changing angular inertia of an object

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7
Q

What is the differnencce between linear and angular inertia

A

linear inertia is dependent only on mass while angular is dependent on mass and distribution of mass (r or k)

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8
Q

What is Ka? What is r? in angular inertia

A

ka is radius of gyration about axis a
r is radius (distance) from particle i to axis of rotation ‘a’

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9
Q

An object free to rotate will rotate about what?

A

Its CG

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10
Q

what is an eccentric axis/when does it occur

A

Not thru an objects CG, occurs in objects that we swing as they have an axis of rotation thrust upon them

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11
Q

Why can objects have multiple moments of Inertia?

A

becuase they can rotate abtout many diffenect axes

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12
Q

What is angular inertia dependent on?

A

mass and distribution of mass (r or k)

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13
Q

Whats greater the moment of inertia about axis b or about the centre of gravity?

A

axis b

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14
Q

What are the 3 different axes which it is possible to have moments of inertia?

A

anteroposterior (saggital), longitudianl (vertical), transverse (frontal)

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15
Q

How many moments of inertia can each axes have?

A

1

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16
Q

Can the moment of our body change the moment of inertia, why?

A

yes it can because our body is not rigid and the cg changes

17
Q

linear velocity ____ as distance from axis of rotation increases

A

increases

18
Q

as implement length increases moment of intertia ____ which makes it _____ to accelarate the object to achieve the same angular velocity

A

also increasess so it makes it harder to accelrate

19
Q

What is H

A

angular momentum

20
Q

What does angular momentum quantify?

A

the angular motion of an object

21
Q

is angular momentum scalar or vector?

A

vector?

22
Q

what is the si unitu for angular momentum?

A

kgxm/s^2

23
Q

For rigid objects what is angular momentum dependeont on?

What about for non-rigid objects?

A

for rigid objects it depns only on w (angular velocity) not moment of inertia bc it remains constant

For non-rigid it depends on both moemnt of inertia and angular velocity

24
Q

Do distribution of mass and mass have the same effect on linear inertia?

A

no. distirbution of mass can change and has a greater effect than the mass on linear inertia

25
Q

In a symmetrical acitvity what is the total angular moemntum of the body?

A

0 - equal and opposture for left/roght arms and legs 0 momentun for trunk bc its not rotating

26
Q

How dose angular momentum relate to newtons first law?

A

angular momentum of an object remains constant
unless a net external torque acts on it
for a rigid body where I is constant the angukar velocity must also be constant
For a non-rigid body, it isn’t necessary for
angular velocity to be constant – only that I × ω
remains constant if no external torques ac

27
Q

what is net torque according to coservation of angukar momentum?

A

0

28
Q

How does angular momentum relate to newtons second law

A

Change in angular momentum of an object is
proportional to net external torque acting on it and in the direction of the torque

29
Q

Angular accelation will be ____ porportonal to torque and _____ porpotional to its moemtn of inertia

A

directly, indierectly

30
Q

according to law of acceleratio, net external torque exerted on an object is ____ to the rate of change on angular momentum

A

porportional

31
Q

What are three ways that changes in angular momentum may be seen as

A
  • speeding up or slowing down of angular velcoty
    change in direction of the axis of rotation
    change in the moment of inertia
32
Q

what is angular impulse

A

change in angular momentum over time

33
Q

torque application can be prolonged by starting with a ____ moment of inertia and ____ to increase ___

A

stary w large moment of inerta and decrease it to increase angular velocity

34
Q

How does angular momentum relate to Newtons 3rd law

A

for every torque eexerted on an object exerts an equal and opposite torque on the first object

Biomechanics (8 decks)

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