Year 2 Biomechanics - Angular Motion

Question 1

Angular motion

Answer 1

Movement of a body or part of a body in a circular path about an axis of rotation

Question 2

General motion

Answer 2

Linear motion + Angular motion

Example- American football spinning in the air but travelling straight

Question 3

Eccentric force

Answer 3

Force applied outside the centre of mass

Question 4

Torque

Answer 4

A measure of a turning or rotational force applied to a body

Question 5

Principal axis of rotation

Answer 5

Longitudinal (head to toe)=360 in ice skating
Transverse (hip to hip)= Sommersault
Frontal (through the belly button)= cartwheel

Question 6

Descriptors - Angular velocity

Answer 6

Rate of rotation

Rate of change of angular displacement

Angular displacement/time taken (rad/s)

Question 7

Descriptors- Moment of inertia

Answer 7

The reluctance of a body to move in angular motion or a reluctance to change its state of motion

Sum of (mass x distribution of the mass from the axis of rotation^2)

Measured in kilogram metres ^2 (KGM2(squared))

Question 8

Angular momentum

Answer 8

The quantity of angular motion possessed by a body

Moment of inertia x angular velocity

Measured in Kgm2rad/s

Question 9

Factors affecting moment of inertia

Answer 9

• Mass

- Distribution of mass

Question 10

Moment of inertia directly linked to Angular velocity

Answer 10

High Moment of inertia = Low Angular velocity

Low Moment of inertia = High Angular velocity

Question 11

Radian(rad)

Answer 11

A unit of measurement of the angle through which a body rotates