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31 Cards in this Set
- Front
- Back
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What are the two aspects of being ready for performing a motor skill? |
Physiologically & Anatomically ready |
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Name keys of readiness |
Bent knees Stretch reflex Lower Center of Gravity Shortening Levers |
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Why is opposition important for force production? Opposition means stepping with the opposite foot |
The use of total body utilizes Weight transfer good for Balance |
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What is linear motion |
Motion along a straight or curved line |
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What is rotary motion |
Motion around an axis Includes angular motion Rotary motion leads to additional development of linear motion Rotary motion for example on a bike; the wheels are spinning in a rotary motion however it leads to development of the bike moving in a linear direction. |
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Velocity is speed plus |
Direction |
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Resultant velocity is a combination of what two components |
Shift and Lift
Horizontal velocity and vertical velocity Anything moving is going to have horizontal velocity and vertical velocity |
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How can spin be used in motor skills |
Confuse an opponent Control an object (for example putting backspin on a golf ball) Affect the flight curve ( for example spin of a baseball) |
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Why is it important for flattening the swinging Arc |
Balance Weight transfer |
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How does air resistnace affect projectiles |
It can affect flight curves Produces drag The angles of release |
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Name one principle of balance |
Keeping weight centered over your base of support Increase the size of your base of support( contact with the ground for example 3 point stance) Lowering center of gravity |
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What should one do when preparing their body to apply mechanical principle |
Muscle tone and strength Muscle tightness and ROM- working on flexibility exercises Cross train and focus on potential mechanical functions |
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What is center of gravity |
Point where all of a bodys mass may be considered to be concentrated Center point of the mass |
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Stability is depended upon? |
Body weight -The heavier something is the more stable Height of a bodys center of mass -If someone stands straight up they are not as stable as compared to bending their knees Size of bodys base of support -Getting in three point stance increases base of support |
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How can an athlete decrease air resistance |
Tight fitted clothing decrease speed ( not useful in most motor skills) Adjust positions to decrease surface area (crouching)- typically seen in cycling Reduce friction of the body or object( helmet, clothing, etc) |
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Difference between static and dynamic balance exercises |
Static- Not moving Dynamic- Moving |
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What is base of support |
contact point with the ground |
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Spin can affect flight path by |
Curve of an object by differing pressures on both sides of an object Ball will always move towards low pressure |
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Name one enviornmental factor of a projectiles flight path |
Gravity and air resistance |
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Relationship between a projectiles optimum angle and the velocity at release or take off |
Inverse relationship as an object is hit or thrown really fast the angle is going to be very low. |
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Does a longer lever apply more or less force |
More force |
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What is "giving" with muscles and joints |
Absorbing force Ex; someone throws medicine ball at you |
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What phase ensures maximum velocity/ force at the relative/ impact point |
Follow through phase |
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True or false; the rebound angle is = to the approach angle |
True |
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What causes drag factor to increase |
Increase speed or surface area |
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How can one change the location of their center of mass |
Any Movement of position |
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What is inertia |
The resistance to change in motion |
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Why is ground reaction important |
Equal and opposite forces |
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Inertia is proportional to |
Mass |
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Name the two internal forces |
Muscular and skeletal systems |
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What is the formula for impulse |
Force multiplied by time |
