Angular kinematics

Question 1

why do we look at angular kinematics?

Answer 1

because we move using angles

Question 2

how do we find angular displacement?

Answer 2

• Angular displacement (θ)

▫ Final angle – initial angle

Question 3

how do we find angular velocity?

Answer 3

• Angular velocity (ω)

▫ change in angular displacement Δθ/change in time Δt

Question 4

how do we find angular acceleration?

Answer 4

• Angular acceleration (α)

▫ change in angular velocity Δω/change in time Δt

Question 5

what are absolute angles?

Answer 5

▫ Angle between a segment
and a global axis
▫ Segment angles

Question 6

what are relative angles?

Answer 6

• Relative angles
▫ Angle between two segments
▫ Joint angles

Question 7

what is the si unit of angles?

Answer 7

• The SI unit is radians (rad)

▫ What is a radian?

▫ Is this meaningful in an applied sporting environment?

▫ Sometimes we have to use them

 E.g. calculating angular momentum, linking linear and angular kinematics (later on…)

Question 8

what is 1 radian?

Answer 8

• We tend to use degrees in applied biomechanics

▫ 1 radian = 180/π degrees (~57.3°)

Question 9

what are revolutions?

Answer 9

• Revolutions (360°) are also sometimes of specific interest

▫ Per second, per minute, …