Quiz #10 Flashcards

1
Q

Characteristic patterns:
- Bimodal (two symmetrical humps)
- Vertical 1-1.2 BW
- A/P 0.15 BW

A

walking

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2
Q

Characteristic patterns:
- Passive peak (heel strike)
- Active peak (forefoot)
- Vertical 2-5 BW
- A/P 0.5 BW

A

Running

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3
Q

An impulse changes the momentum of an object

A

Impulse - momentum relationship

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4
Q

impulse =

A

change in momentum

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5
Q

Area under Force-Time curve =

A

impulse

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6
Q

impulse = mass x acceleration
impulse = m(change in v / change in t)

A

impulse - momentum relationship

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7
Q

Major contributors to impulse

A

mass and change in velocity

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8
Q

Types of friction:
Friction acting between two surfaces that are not moving relative to one another

A

static

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9
Q

During stationary conditions, it is represented on FBD by _

A

horizontal force

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10
Q

During dynamic conditions, it must be represented on FBD by an _

A

opposing force

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11
Q

Types of friction:
Friction acting between two surfaces that are moving relative to one another

A

Kinetic

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12
Q

Kinetic Friction:
Resistive force between objects that slide or rub against each other

A

sliding

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13
Q

Kinetic Friction:
Resistive force when objects roll over a supporting or contacting surface

A

rolling

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14
Q
  • acts parallel to the area of contact
  • opposes motion or the tendency for motion
A

static and sliding friction

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15
Q

Depends on two things:
- Coefficient of friction
- The perpendicular force

A

friction force

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16
Q

Does size of area of contact influence friction?

A

No

17
Q

Under static conditions:
- F friction = F applied
- coefficient of static friction calculated just before _ occurs

A

sliding

18
Q

Under kinetic (sliding) conditions
- coefficient of sliding friction influence motion
- at low speeds is _

A

constant

19
Q

Used to understand when slipping likely

A

dynamic coefficient of friction

20
Q

The resistance of an object to a change in motion

A

inertia

21
Q

Linear inertia

A

quantified as mass

22
Q

The property of an object that resists changes in angular motion
- quantified as the object’s moment of inertia

A

angular inertia

23
Q

Humans manipulate their moments of _

A

inertia

24
Q

Moment of inertia affected by:
- mass
- How the mass is distributed relative to the _

A

axis of rotation

25
Q

When mass is distributed closer to the axis of rotation the moment of inertia is _

A

smaller