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KIN: Basic Concepts
| Question | Answer |
|---|---|
| What is COG? | Hypothetical point at which all mass would appear to be concentrated |
| Where is the COG in the human body? | Slightly anterior to the second sacral vertebra |
| What happens if the LOG falls outside the BOS? | The object will fall |
| What happens to the object as the COG gets closer to the BOS? | It becomes more stable |
| What happens to the object as the BOS gets larger? | It becomes more stable |
| What is Newton's 3rd Law? | Law of Reaction: For every action there is an equal and opposite reaction |
| What is the Law of Inertia? | An object will remain at rest or in uniform motion unless acted upon by an unbalanced force |
| What is Newton's 2nd Law? | Law of Acceleration: Acceleration of an object is proportional to the unbalanced forces acting on it and inversely proportional to the mass of that object |
| What are concurrent force systems? | Two or more forces acting at a common point of application but in divergent directions EX: Muscle that has different heads (Delts) |
| Who is always the winner in levers? | Force |
| What is a first class lever? | FAR |
| What are examples of a first class lever? | Seesaw, triceps, supraspinatus, scissors |
| What is a second class lever? | ARF |
| What is always larger in a second class lever: MA of F or MA of R | MA of F |
| What are examples of a second class lever? | Going up on the balls of your feet, nutcracker, wheelbarrow |
| What is a third class lever? | AFR |
| What is always larger in a third class lever: MA of F or MA of R | MA of R |
| What are examples of third class levers? | Biceps brachii, shoveling |
| What type of lever is better for increased ROM? | Third class lever |
| Why is a third class lever hard to over come? | Because the MA of F is so close to the axis of rotation |
| The muscle will be the force during what type of contraction? | Concentric |
| The muscle will be the resistance during what type of contraction? | Eccentric |
| What is the MA? | MA = MA of F: MA of R |
| When is the MA greater than one? | When the MA of F is larger than the MA of R |
| Which class of levers will always have a MA greater than one? | Second class levers |
| What does a higher MA indicate? | Better efficiency |
| Which class of levers will always have a MA of less than one? | Third class levers |
| What is the formula for work? | W = F x D |
| Where can you find the largest and strongest MA? | at 90 degrees |
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