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March 29, 2024, 05:45:34 am

Author Topic: friction on a banked road  (Read 4475 times)  Share 

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jinny1

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Re: friction on a banked road
« Reply #30 on: June 13, 2011, 06:01:28 pm »
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My tutor said all these equations are wrong because if the car is travelling faster or slower than the design speed, then the Normal reaction force would be constantly changing. Thus the equations are rendered useless.
« Last Edit: June 13, 2011, 06:04:18 pm by jinny1 »
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cranberry

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Re: friction on a banked road
« Reply #31 on: June 13, 2011, 06:20:00 pm »
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i don't think VCAA will ask us to find any other speed apart from the design speed, min speed(with friction) or max max speed(with friction) or to find the angle by them giving us either the min, max or design speeds...
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yawho

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Re: friction on a banked road
« Reply #32 on: June 13, 2011, 07:16:26 pm »
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My tutor said all these equations are wrong because if the car is travelling faster or slower than the design speed, then the Normal reaction force would be constantly changing. Thus the equations are rendered useless.

so true

first answer 5.2 m/s
Second answer requires solving simultaneous equations:
vert comp, net force=Ncos-mg-fsin=0, Ncos15-8000-fsin15=0
hori comp, net force=Nsin+fcos=mv^2/r, Nsin15+fcos15=800x10.2^2/10
f=5930 N approx

xZero

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Re: friction on a banked road
« Reply #33 on: June 13, 2011, 07:20:59 pm »
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My tutor said all these equations are wrong because if the car is travelling faster or slower than the design speed, then the Normal reaction force would be constantly changing. Thus the equations are rendered useless.

Mad, my little theory in my head about normal force changing with different speed is correct :P
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HCbigstick

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Re: friction on a banked road
« Reply #34 on: June 13, 2011, 08:11:21 pm »
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Does anyone know how to do that problem?

yawho

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Re: friction on a banked road
« Reply #35 on: June 13, 2011, 10:16:37 pm »
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see 2 posts earlier

jinny1

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Re: friction on a banked road
« Reply #36 on: June 13, 2011, 10:26:56 pm »
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Does anyone know how to do that problem?

ill bet my life that vcaa wont ask you those sorts of question.
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IsikCollege

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Re: friction on a banked road
« Reply #37 on: June 14, 2011, 09:07:42 am »
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i dont think they ask these questions, they are too difficult,

golden

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Re: friction on a banked road
« Reply #38 on: June 14, 2011, 09:23:14 am »
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If they do we'll be prepared for them hopefully.
« Last Edit: June 20, 2011, 05:43:55 pm by golden »
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