• Shuffle
Toggle On
Toggle Off
• Alphabetize
Toggle On
Toggle Off
• Front First
Toggle On
Toggle Off
• Both Sides
Toggle On
Toggle Off
Toggle On
Toggle Off
Front

### How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

Play button

Play button

Progress

1/19

Click to flip

### 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 Pre-Observation - 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