Lecture 15 Flashcards

1
Q

Human body moment of inertia about an axis is

A

Variable

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2
Q

Humans can manipulate their

A

Momentum of inertia

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3
Q

Manipulating moment of inertia in human body movement examples

A

Tucking in a dive

Bringing arms in on spinning in skating

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4
Q

Linear momentum equation

Angular momentum equation

A

P = mv

L = moment of inertia x angular velocity

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5
Q

Newtons 1st law of motion (angular motion)

A

An object at rest tends to remain at rest and an object that is spinning tends to spin with constant angular velocity

UNLESS it is acted on by a nonzero net TORQUE

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6
Q

Conservation of angular momentum happens if

A

There is no net external torque act on the object

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7
Q

What does newtons first law not require in angular motion

A

Angular velocity to be constant

Instead the product of moment of inertia x angular velocity must be constant

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8
Q

When we extend our arms we cause

A

Angular momentum to remain constant

Moment of inertia to increase and angular velocity to decrease

Opposite for arms flexed

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9
Q

Newtons 2nd law of motion in angular motion is when

A

sum of Torque cannot = 0

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10
Q

Object will accelerate in

A

the direction of the net external torque

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11
Q

The angular acceleration will be directly proportional to

A

The net external torque

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12
Q

The angular acceleration will be inversely proportional to

A

The moment of inertia

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13
Q

What is the equation for sum of torque

A

Sum of Torque = moment of inertia x angular acceleration

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