Motion in a straight or curved line. A 100m athlete will travel in a straight line during the race
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What is Newtons 1st law of motion?
Every body continues in its state of rest or motion in a straight line (and uniform velocity) unless compelled to change that state by external forces exerted upon it
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What is Newtons 2nd law of motion?
The rate of momentum of a body (or the acceleration for a body of constant mass) is proportional to the force causing it and the change that takes place in the direction in which the force acts.
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What is Newtons 3rd law of motion?
To every action (force), there is an equal and opposite reaction (force).
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What is a scaler quantity and give an example used in sport
Measurements are described in terms of just their size
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How do you calculate 'Distance'?
Speed x time
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How do you calculate 'Speed'? What are the units?
Distance/time. In m/s
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How do you calculate 'Time'?
Distance/Speed
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What is 'Centre of Mass'?
The point of concentration of mass or the point of balance of the body
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Give 5 ways in which you can increase your stability.
Lower the centre of mass. Ensure you position your line of centre of mass central to your base. Widen base of support. Increase contact points for bigger base of support. Increase mass of performer.
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Give an example of a 1st class lever. Draw/describe the diagram?
Flexion and extension of the head/neck. Extension of the elbow. Fulcrum is in middle.
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Give an example of a 2nd class lever. Draw the diagram?
Plantarflexion of the ankle. Resistance going down is in the middle
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Give an example of a 3rd class lever. Draw the diagram?
Any other joint movement e.g flexion/extension of knee. Effort going up is in the middle
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What is mechanical advantage and which levers have this? What are the benefits?
When the force arm is longer than the resistance arm. Found in 2nd class levers. Generate large forces.
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What is mechanical disadvantage and which levers have this? What are the benefits of this?
When the resistance arm is longer than the force arm. Found in 1st and 3rd class levers. Large range of movement and can move fast.
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Other cards in this set
Card 2
Front
What is Newtons 1st law of motion?
Back
Every body continues in its state of rest or motion in a straight line (and uniform velocity) unless compelled to change that state by external forces exerted upon it
Card 3
Front
What is Newtons 2nd law of motion?
Back
Card 4
Front
What is Newtons 3rd law of motion?
Back
Card 5
Front
What is a scaler quantity and give an example used in sport
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