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Motion Analysis > Quiz #6 > Flashcards

Quiz #6 Flashcards

1
Q

Motion of bodies that have been projected into the air

A

Projectile motion

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2
Q

Understanding _ _ helps in learning to control or predict what happens to an object when in the air

A

projectile motion

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3
Q

Solid line arcs up and drops below dotted line

A

Vertical displacement

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4
Q

Solid line goes diagonally down below dotted line

A

Vertical velocity

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5
Q

Solid line is below dotted line and is parallel

A

Vertical acceleration

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6
Q
  • inanimate
  • animate
A

classes of projectiles

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7
Q
  • trajectory (parabola)
  • instant of release
  • instant of contact
A

projectile motion definitions

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8
Q

Factors that influence the trajectory of a projectile

A
  • projection angle
  • projection speed
  • projection height
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9
Q

Factors that influence the trajectory of a projectile: projection angle
- 0 degrees indicates a directly _ _

A

horizontal projection

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10
Q

Factors that influence the trajectory of a projectile: projection angle
- 90 degrees indicates a directly _ _

A

vertical projection

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11
Q

Factors that influence the trajectory of a projectile: Projection angle
- Between 0 and 90 degrees trajectory will be _

A

parabolic

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12
Q

Factors that influence the trajectory of a projectile: projection speed
Strongly influences the _ and _ of trajectory

A

height, length

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13
Q

Factors that influence the trajectory of a projectile: projection speed
- _ _of release (takeoff) determines:
- height achieved after release
- time it takes to reach maximum height
- time it takes to fall back to the release position
- the velocity of the object when it returns to release position

A

vertical speed

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14
Q

Factors that influence the trajectory of a projectile: projection speed
- _ _of release (takeoff)
- in the absence of air resistance remains constant until the instant of contact
- along with the time in the air determines horizontal distance (range)
- becomes smaller as the projection angle approaches 90 degrees
- becomes larger as the projection angle approaches 0 degrees

A

horizontal speed

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15
Q

Factors that influence the trajectory of a projectile: projection height
- difference in vertical height between the instant of release and the instant of contact
- height at instant of release _ height at instant of contact (soccer kick)

A

=

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16
Q

Factors that influence the trajectory of a projectile: projection height
- difference in vertical height between the instant of release and the instant of contact
- height at instant of release _ height at instant of contact (shot put)

A

>

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17
Q

Factors that influence the trajectory of a projectile: projection height
- difference in vertical height between the instant of release and the instant of contact
- height at instant of release _ height at instant of contact (free throw)

A

<

18
Q

Projection height - release height = contact height (soccer kick)
- Distance up _ distance down
- Vertical speed at the instant of release _ vertical speed at the instant of contact
- to maximize range projection angle _ 45 degrees

A
  • =
  • =
  • =
19
Q

Projection height - release height = contact height (soccer kick)
- parabola is _
- time up _ time down
- Horizontal distance while object goes up _ horizontal distance while object goes down

A
  • symmetric
  • =
  • =
20
Q

Projection height - release height > contact height (shot put)
- parabola is _
- time up _ time down
- Horizontal distance while object goes up _ horizontal distance while object goes down

A
  • asymmetric
  • <
  • <
21
Q

Projection height - release height > contact height (shot put)
- Distance up _ distance down
- Vertical speed at the instant of release _ vertical speed at the instant of contact
- to maximize range projection angle _ 45 degrees

A
  • <
  • <
  • <
22
Q

Projection height - release height < contact height (Free throw)
- Distance up _ distance down
- Vertical speed at the instant of release _ vertical speed at the instant of contact
- to maximize range projection angle _ 45 degrees

A
  • >
  • >
  • >
23
Q

Projection height - release height < contact height (Free throw)
- parabola is _
- time up _ time down
- Horizontal distance while object goes up _ horizontal distance while object goes down

A
  • asymmetric
  • >
  • >
24
Q

(Vf)^2 = Vi^2 + 2a(Pf - Pi)

A

equation of motion

25
Q

(Yvf)^2 = Vvi^2 + 2a(Yf - Yi)

A

vertical motion

26
Q

(Vhf)^2 = Vhi^2

A

horizontal motion

27
Q

The description of angular motion without regard to its cause

A

angular kinematics

28
Q

All parts on the object of interest move through the same angle, but do not undergo the same linear displacement

A

angular

29
Q

Two lines that intersect at a vertex
- vertex (axis, joint)

A

angle

30
Q

Types of angular motion in human movement:
- the knee

A

about an axis through a joint

31
Q

Types of angular motion in human movement:
- somersault or twist

A

about the center of mass

32
Q

Types of angular motion in human movement:
- high bar in gymnastics

A

about an external axis

33
Q

Types of angular motion in human movement:
- each assumes that the axis is _
- often only have an instantaneous _ _ _

A
  • stationary
  • center of rotation
34
Q

Angular kinematics: units of measurements

A
  • revolution
  • degree
  • radian
35
Q

Angular kinematics: units of measurements
- layman description of halves and wholes
- implied
- full twisting, double back somersault

A

revolution (rev)

36
Q

Angular kinematics: units of measurements
- more scientific but not mathematical
- normally used to describe part of a revolution

A

Degree (deg)

37
Q

Angular kinematics: units of measurements
1 deg = _ of a revolution

A

1/360

38
Q

Angular kinematics: units of measurements
- the measure of an angle from a circle’s center described by an arc equal to the length of the radius of the circle
- scientific and mathematical
- unit is dimensionless

A

radian (rad)

39
Q

Angular kinematics
- types of angles

A
  • absolute angles (segment angles)
  • relative angles (joint angles)
40
Q

Angular kinematics: Types of angles
- describes the orientation of a segment in space

A

absolute angle

41
Q

Angular kinematics: Types of angles
- describes the orientation of a joint in space

A

relative angle

Motion Analysis (14 decks)

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