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About The Hood River news. (Hood River, Or.) 1909-current | View Entire Issue (April 22, 2015)
B10 Hood River News, Wednesday, April 22, 2015 E\9LFNL:KLWLQJ(GLWRU-HII6FKLQNHO*UDSKLFV9RO1R Ramp A has a smooth flat surface. Ramp B has a rough uneven surface. 7DNHDJXHVVDWZKLFKFDUZLOO ZLQWKHUDFHDQGKDYHDIDPLO\ PHPEHUGRLWWRR$GGXSWKH QXPEHUVDORQJHDFKWUDFN7KH FDUZLWKWKHORZHVWQXPEHULV WKHZLQQLQJFDU&LUFOHWKHFDU WKDWZRQ On which ramp would a race car go faster? When a car goes down a smooth surface like ramp A, it will travel more quickly because it has less surface friction. )5,&7,21 6&,(1&( 52//,1* 5$&,1* )$67(5 60227+ :+((/6 5$036 528*+ 602.( 67,// 52// '5$* 6/2: /(66 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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he 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. )LQGWKHZRUGVLQWKHSX]]OH 7KHQORRNIRUHDFKZRUGLQWKLVZHHN¶V .LG6FRRSVWRULHVDQGDFWLYLWLHV 2 5 6 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. 4 3 8 TOTAL: TOTAL: TOTAL: 6WDQGDUGV/LQN0DWK1XPEHU6HQVH &DOFXODWHVXPVWR Tonkin Subaru is proud to be the primary sponsor of The Cherry Festival Parade Y o u ’ r e I n v i t e d Cherry Festival SUBARU OPEN HOUSE Saturday, April 25th at 10am Saturday and Sunday Noon to 4pm • • • • See the full line of new Subaru models. Free Subaru merchandise giveaways. Bring the whole family for a test drive. 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