Torque and Angular Motion Fundamentals

Tendency of an eccentric force to rotate an object.

Torque

The distribution of __ in the human body means we cannot simply locate the center of gravity from measuring equal distances the top of the head to the bottom.of the feet.

mass

Motion around a fixed axis in a circular path.

Angular Motion

Force directed through the center of mass.

Centric Force

Force applied not through the center of mass.

Eccentric Force

Point around which a body rotates.

Axis of Rotation

Another term for torque, indicating rotational effect.

Moment of Force

Perpendicular distance from axis to force line.

force arm/moment arm/lever arm

Sum of all torques indicating final motion direction.

Net Torque

Determines torque direction based on rotation type.

Right Hand Thumb Rule

Torque causing counterclockwise rotation.

Positive Torque

Torque causing clockwise rotation.

Negative Torque

Point where mass is evenly distributed in an object.

center of mass

The center of mass is applied only in the __ direction

horizontal

Point where all torques sum to zero vertically is the

center of gravity

In the case of ___ the center of the object becomes the axis of rotation

pure rotary motion

Torque Calculation

T = F x d, where F is force.

Torque is a __ quantity

vector

Angular Momentum Change is associated with ___

Torque

Changes in angular momentum are normally the result of changes in the ____ (which changes the moment of inertia) or changes in ___.

radius of rotation or angular velocity

Moment does not change angular momentum in what force

static force

The relative degree of linear or angular motion depends on...

how far away from the center the eccentric force is applied

Torque depends on what two factors

Magnitude of externally applied force

The distance that the force is applied form the axis of rotation

How does COG change?

changes as we redistribute our weight and change positions during activity