To increase angular velocity, the radius is shortened. There are two forces generated in
angular motion.
Radial force generated along lever.
- Centrifugal: force pushing out along the radius, away from the axis of rotation.
- Centripetal: force pushing in along the radius, towards the axis of rotation.
- Translating Motion
Translating motion is when angular motion combines to create linear motion. An example
of this would be the bench press, in which there is angular motion around the shoulder
(glenohumeral) joint, but linear motion of the held weights.
- Acceleration
Acceleration is the change in velocity or direction per unit of time.- Work
Work (W) can be defined as the accumulated product of the force (F) created and exerted
on an object and the distance (D) the object is displaced in the direction it has been moved.
W = F x D
- Tangental Force
A tangential force is perpendicular, or at a 90º angle, to the radius.^Machines of the Human Body
Levers of the Musculoskeletal SystemA machine is any device which transfers a force from one point to another. According to
the Principle of Conservation of Energy, a machine can produce either an increase in force with a
corresponding decrease in motion, or an increase in motion with a corresponding decrease in force.
There are only two basic types of machines: levers, and inclined planes. In relation to the human
body, we will be talking about a system of levers that are used to transfer force from one point to
another. A lever is considered a rigid or semi-rigid body that, when subjected to a force whose line
of action does not pass through its pivot point, exerts a force on any object impeding its tendency
to rotate. Understanding the terminology of levers is important, so here are some definitions which
will be used in this discussion: