Basics and Terminology 3 Flashcards
The path of motion around a fixed axis and therefore a circular path is called:
Angular motion
Time rate of change of angular position of a rotating body is called:
Angular velocity
Time rate of change of angular velocity of a rotating body is called:
Angular acceleration
The point about which a body rotates is called:
Axis of rotation
Perpendicular distance from an axis of rotation to a line along which a force acts is called:
lever arm
What are two other names for lever arm?
Force arm
Moment arm
Product of force and lever arm is called:
torque
The tendency of an eccentric (off center) force to rotate an object around and axis is called:
torque
Torque applies to what objects?
rotating
Torque directly applies to what else?
Motion of the human body
How is torque related to the human body?
Muscles apply force to bone for us to move
Muscle forces are _____ and therefore we move because of torque
eccentric
The ______ of the muscle is where force is applied.
Insertion
This consists of a rigid or semi-rigid object (_____) that is capable of rotating around and axis (_____)
Lever system
(lever)
(fulcrum)
The force is between the effort and the load/resistance. Lever System?
Type 1 Lever
First Class
Examples of Type 1/First Class levers
See saw, claw hammer
The load/resistance is between the fulcrum and the effort. Lever system?
Type 2 Lever
Second Class
Examples of type two Lever systems.
Stapler, wheel barrow
The effort is between the fulcrum and the load/resistance. Lever system?
Type 3 Lever
Third Class
Examples of Type 3 Lever?
Fishing rod, broom, tweezers
If the fulcrum is in the middle of the lever, which force has advantage?
Neither force has advantage, the ratio is 1
Ratio of the motive of force (effort) to a given resistance force is called what?
Mechanical advantage
Mechanical Advantage (MA) =
Mm/Mr (motive force divided by resistance force)
Greater than 1 do you gain or lose mechanical advantage?
gain
Chiropractic adjustment mechanical advantage is less than 1 so what do we do?
Speed and stance
Is type 1 lever in the body common?
no
Example of type one lever in the body?
Neck and head
Example of type 2 lever in the body?
Standing on balls of feet
Type 3 lever in the body?
Biceps with hand lifting something.
