Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Biomechanics > Angular Kinematics > Flashcards

Angular Kinematics Flashcards

1
Q

angular/rotational motion

A

all parts of the body/object move along a circular path about an axis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

internal axis

A

axis through hip joint

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

external axis

A

gymnastics bar

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

real axis (and internal)

A

bike wheel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

imaginary axis

A

track

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

absolute angles

A

measured from immovable line (constant)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

relative angles

A

measured between segments

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

clockwise (CW) movement

A

negative

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

counterclockwise (CCW) movement

A

positive

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

right hand rule

A
  • fingers curl in the direction of the rotation
  • thumb = vector representing motion
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what is general motion?

A

combination of linear and angular motion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

measuring joint angles - flexion

A

positive (exception: knee)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

measuring joint angles - extension

A

negative

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

why is the Q-angle larger in women than men?

A

wider pelvis relative to leg length

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

large Q-angle

A

patellofemoral pain due to extreme patellar tracking

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

radian

A

size of the angle when the arc length is equal to the radius (57.3 degrees)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

how many pi are in a circle? (360 degrees)

A

2 pi

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

angular position (θ)

A

orientation of a line w respect to another line or plane

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

angular displacement (Δθ)

A

difference in the initial and final angular positions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

avg angular velocity (ω)

A

rate of change in angular position

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

angular speed

A

angular distance / change in time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

avg angular acceleration (α)

A

rate of change of angular velocity

23
Q

is angular displacement a vector quantity?

A

yes

24
Q

angular distance

A

sum of all angular changes

25
Q

angular displacement

A

difference between the initial and final positions

26
Q

positive angular acceleration

A
  • increasing angular velocity in the + direction
  • decreasing angular velocity in the - direction
27
Q

negative angular acceleration

A
  • increasing angular velocity in the - direction
  • decreasing angular velocity in the + direction
28
Q

what is the slope of an angular position vs time graph?

A

angular velocity

29
Q

what is the slope of an angular velocity vs time graph?

A

angular acceleration

30
Q

inexperienced paddle boarders

A

shoulder ROM > hip ROM

31
Q

experienced paddle boarders

A

greater shoulder motion & elbow extension positions at end of paddle stroke

32
Q

experienced batters, pitchers, tennis players

A

faster joint angular velocities

33
Q

how can athletes increase performance?

A

faster segment movement = faster movement of ball, bat, etc.

34
Q

how does the rotation of the limb affect the object?

A

increase radius > increase curvilinear distance > increase velocity

35
Q

curvilinear distance (s)

A

Δs = rΔθ

m = (m)(radian)

36
Q

greater radius

A

greater linear distance traveled

37
Q

curvilinear velocity (VT)

A

VT = rω

m/s = (m)(rad/s)

38
Q

T/F: as a n object rotates around an axis, all parts of the object rotate at the same angular velocity but at different linear velocites

A

True

39
Q

what does the linear velocity of a rotating point depend on?

A

its distance from the axis of rotation

40
Q

T/F: as an object rotates around an axis, all parts of the rigid object rotate at the same angular velocity but at different linear velocities

A

True

41
Q

an object is accelerating when it is:

A
  • speeding up or slowing down (change in velocity)
  • changing direction
42
Q

what is the angular acceleration when the angular velocity is constant?

A

angular accel = 0

43
Q

tangential acceleration (aT)

A

linear acceleration of a point on a rotating object that acts tangentially to the path

44
Q

when is tangential acceleration not zero?

A

when a point is speeding up or slowing down (represents change in linear v)

45
Q

radial (centripetal) acceleration

A
  • toward center of circle, axis of rotation
  • represents change in direction
46
Q

is more or less force needed to produce radial acceleration?

A

more force

47
Q

two factors that make it difficult to stay on a curved path:

A

1) smaller radius
2) greater tangential velocity

48
Q

is there an angular acceleration when the angular velocity is constant?

A

No, constant angular velocity = no angular acceleration

49
Q

is there linear acceleration when the angular velocity is constant?

A

Tangential acceleration: no
Radial acceleration: yes, because there will still be a change in direction so the object experiences accel.

50
Q

projectile at release

A
  • tangential acceleration becomes zero
  • radial acceleration becomes zero
  • VT = VRi
51
Q

are tangential and radial accelerations parallel or perpendicular to one another?

A

perpendicular

52
Q

if angular velocity is constant

A
  • tangential velocity is constant
  • acceleration = 0
53
Q

if angular acceleration is zero

A
  • tangential acceleration = 0
  • radial accel. and tangential vel. will have magnitudes

Biomechanics (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions