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Hood River News, Wednesday, April 22, 2015
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Ramp A has a smooth
flat surface.
Ramp B has a rough
uneven surface.
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On which ramp would a
race car go faster?
When a car goes down a smooth surface like
ramp A, it will travel more quickly because it
has less surface friction.
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Friction is what happens when two things rub
against each other. Friction slows or stops
moving things. A rolling ball eventually stops
because friction between the ball and the
ground brings it to a stop.
Before racing down the
strip, drag racers comple drag
burnout, which spins the te a
wheels while the car sta car’s
ys still.
This causes the tires to hea
and smoke due to frictio t up
n.
Drag racing tires perform
better at higher temper
atu
A burnout is the quickest res.
wa
to raise tire temperature y
immediatelyprior toa dra
grace.
See Friction in Action!
Roll a ball from one end of a basketball court
ourt to th
the
he other.
Pretty easy, right?
Now try to roll the
he basketball that same
sam distance on
grass or gravel. Friction makes that a lot harder to do!
2. Starting at the same time,
let them roll down ramp.
what happens when they
get to level ground?
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The bottle with the
water in it will travel
faster at first due to
the weight of the
water giving it a
boost. But on level
ground, the water
causes friction,
which will slow it
down, while the
empty bottle rolls a
longer distance.
1. Get two plastic bottles.
Leave one empty. Fill the
other halfway with water.
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Ramp B has a rough surface, which creates more
friction when the car travels over it, making it go
much slower than the car on ramp A.
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TOTAL:
TOTAL:
TOTAL:
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