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19 Cards in this Set

  • Front
  • Back
1st Class Lever
-joint lies between muscle & load
- most efficient
- weakest
- et. flexing neck & posturing head forward & downward
2nd Class Lever
- load lies between joint & pulling muscle
- strongest
- eg. lifting a wheelbarrow
3rd Class Lever
- muscle lies between joint & load
- poor mechanical advantage
- most common in body
- eg. elbow joint
Principle of Stability
(Principles of Biomechanics)
stable balance requires:
- wide base of support
- centre of gravity within base of supporrt
- large mass
- low centre of gravity
Principle of Number of Joints
(Principles of Biomechanics)
- max force is produced when all joints that can be used are used (allows more muscles to contract)
Principle of Order of Joints
(Principles of Biomechanics)
- max velocity is produced when joints are used in order from largest to smallest
Principle of Impulse
(Principles of Biomechanics)
- the greater the applied impulse, the greater the increase in velocity
Principle of Direction
(Principles of Biomechanics)
- movement occurs in direction opposite to that of an applied force
- for every action, there is an equal & opposite reaction
Principle of Angular Motion
a) angular motion is produced when a force is applied at a distance from centre of gravity or axis of rotation (eg. a diver)
b) angular momentum can be changed by changing the position of extremities in relation to axis of rotation (eg. spinning)
Law of Inertia
(Newton's First Law)
- a body will remain at rest or in a state of constant velocity unless acted upon by an external force
Law of Acceleration
(Newton's Second Law)
- F=ma
- relationship between object's mass, its acceleration & applied force
- a force applied to a body causes an acceleration & applied force of a magnitude proportional to the force, in the direction of the force, inversely proportional to the body
Law of Reaction
(Newton's Third Law)
- for every action there is an equal & opposite reaction
Types of motion
a) linear - movement in a particular direction
b) rotational - movement about an axis; force is off centre, causing rotation
Effective Ways to Communicate
- positive feedback
- plan key words to say
- use analogies/symbols
- diagnosis
- corrections/remediation
4-Step Approach
Observation of a Skill
1) pre-observation planning
2) observations
3) diagnosis
4) corrections/remediation
- identify the purpose
1) preliminary movements
2) backswing/recovery
3) force producing
4) critical instant
5) follow-through
Observation Plan
1. identify observation task & select relevant features
2. appropriate observation strategies
3. number of observations required
4. positioning strategies
Primary Error
- main problem
- should be corrected
Secondary Error
- provide information about primary errors
- result of primary errors
- cannot attempt to correct a secondary error without looking at primary error