Angular motion

Question 1

Angular motion

Answer 1

-Angular motion is the movement of a body in a circular motion around its principal axis of rotation
-Angular motion is caused by an external force being applied outside of the centre of mass of a body

Question 2

Axes of rotation (transverse axis)

Answer 2

Transverse axis runs horizontally from side to side of the body e.g a diver doing somersaults would be rotating around the transverse axis

Question 3

Axes of rotation (frontal axis)

Answer 3

-Frontal axis runs horizontally from front to back of the body e.g a gymnast doing a cartwheel is a rotation around the frontal axis

Question 4

Axes of rotation (longitudinal axis)

Answer 4

-The longitudinal axis runs from the top to the bottom of the body e.g a dancer doing a pirouette is a rotation around the longitudinal axis

Question 5

Moment of intertia

Answer 5

-Moment of inertia is the tendency of an object to resist angular motion

Question 6

Factors affecting moment of intertia

Answer 6

-Mass- the larger the mass the more the moment of inertia
-Distribution of mass from the axis of rotation- closer mass= smaller moment of inertia

Question 7

angular velocity

Answer 7

-Angular velocity is the rate of the change of angular displacement of an object (radians/s)
-Angular velocity = angular displacement/time

Question 8

Angular momentum

Answer 8

-Angular momentum is the quantity of angular motion possessed by a rotating object (Kgm2/s)
-Angular momentum= Moment of inertia x angular velocity

Question 9

Fluid mechanics (factors affecting drag/ air resistance)

Answer 9

Velocity
-Mass, the greater the mass of an object the less effect air resistance or drag will have on it
-Surface characteristics= a smoother surface will experience less air resistance, swimmer can reduce drag by wearing a swimming cap