Biomechanics: Angular Motion Flashcards
Define angular motion
Movement/rotation around a fixed point or axis
What is an off-centre force also referred to as?
An eccentric force
What does angular motion occur as a result of?
Torque
How can moment of force/torque be calculated?
Force x Perpendicular distance from the fulcrum (newton metres) (newtons)
Describe Newton’s 1st Law of Angular Motion
A body will continue rotating/spinning with a constant angular velocity unless acted upon by an external torque/rotational force.
Describe Newton’s 2nd law of angular motion
The rate of change of angular momentum of a body is directly proportional to the force causing it and the change takes place in the direction in which the force is applied.
Describe Newton’s 3rd law of angular motion
When a force is applied by one body to another, the second body will exert and equal and opposite force on the other body.
Define angular displacement
The smallest change in angle between the start and finish point of a rotation
What is the unit of measurement for angular displacement
Radians/r or degrees /°
What is the definition for angular velocity?
The rate of rotation around an axis of rotation
What is the calculation for angular velocity?
Define angular acceleration
The rate of change of angular velocity
How can angular acceleration be calculated?
What is the unit of measurement for angular velocity?
Radians per second (rad/s)
What is the unit of measurement for angular acceleration?
Rad/s2