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10
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Which coefficient of friction (static or dynamic) is almost always higher?
Static - This explains why it is harder to start moving a heavy sled than to keep it moving.
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10
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What is power?
the rate at which work is performed - P = W/T or P = Fv
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10
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Give an illegal use of CoR in sport
Freezing of baseballs / bats CoR is limited
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what does the term collision mean?
when two or more objects come into contact with (exert forces on) each other during a short period of time.
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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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give a legal example of CoR use in sport
squash ball warm up - ball travels faster when it is warm
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eraser
Reset score!
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seesaw
Swap points!
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fairy
Take points!
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25
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banana
Go to last place!
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10
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What factors influence amount of friction in sport?
nature of footwear and the surfaces , reaction forces - e.g weight
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What can dynamic/kinetic friction also produce?
heat and sound
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trap
No points!
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gift
Win 10 points!
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rocket
Go to first place!
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banana
Go to last place!
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10
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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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what does static friction relate to?
refers to the force acting between two surfaces that are not moving relative to each other
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trap
No points!
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rocket
Go to first place!
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gift
Win 20 points!
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lifesaver
Give 25 points!
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10
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What is the equation for friction force?
f = coefficient friction N (or R)
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10
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What sport would you want a high CoF and why?
spikes / studs - increase grip
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10
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Define friction
“A force that acts parallel to the interface of two surfaces that are in contact, and opposes their relative motion”
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