Test 2 Flashcards
Define Work
Work is the product of force and displacement
What is torque?
the turning effect produced by a force
Example of centric force
pushing a desk; linear motion
Example of force couple
Upper trapezius, lower trapezius, serratus anterior, which rotates the scapula
What determines torque
force and radius
define movement arm
the distance of the force’s line of action and its point of rotation
What is a lever
a rigid bar that rotates about an axis
Give an example of the three classes of levers?
- neck
- calf raises
- bicep curl
What is mechanical advantage?
the force arm length divided by the resistance arm length
What is the center of gravity?
the point in an object where its mass is evenly distributed or balanced; the point through which the force of gravity acts
What influences the location of the center of the gravity?
body type and body position
What influences stability
size of the base and support, height of the COG, weight of the object/person
What are the 3 planes of motion?
sagittal, frontal, and transverse
What is a radian?
the ratio of the arc length over the radius
Arc length is proportional to what?
radius
