“A force that acts parallel to the interface of two surfaces that are in contact, and opposes their relative motion”
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10
What is Newton's First Law?
Law of inertia - an object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction, unless acted upon by an
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What is meant by Work?
the application of force over a distance W=Fd
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boom
Lose 50 points!
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rocket
Go to first place!
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rocket
Go to first place!
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thief
Give points!
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What sport would you want a high CoF and why?
spikes / studs - increase grip
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How can power output be optimised
Technique and sports equipment design
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Give an illegal use of CoR in sport
Freezing of baseballs / bats CoR is limited
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10
what is the equation for coefficient of restitution?
relative velocity after collision / relative velocity before collision
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10
What is Newton's 3rd law?
Law of reaction - for every action there is an equal and opposite reaction
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What does the coefficient of friction mean?
nature of the 2 surfaces in contact with each other - how slippy or rough they are
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lifesaver
Give 20 points!
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seesaw
Swap points!
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fairy
Take points!
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banana
Go to last place!
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What is power?
the rate at which work is performed - P = W/T or P = Fv
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What is dynamic/kinetic friction?
the frictional force between surfaces that are moving relative to each other
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lifesaver
Give 25 points!
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gold
Win 50 points!
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shark
Other team loses 20 points!
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thief
Give points!
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How is the CoR use controlled in sport - give an example
New tennis / table tennis balls in matches; table tennis balls / basketball checked and must bounce to a certain height; golf club / baseball bats limit CoR
