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November 01, 2025, 08:57:53 am
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Author Topic: Acceleration  (Read 2548 times)  Share 

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Studyinghard

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Acceleration
« on: January 04, 2010, 09:49:51 pm »
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A car that is accelerating uniformly travels 18 m in the fi fth second of its motion.
a What is the acceleration of the car?
b How far does the car travel in 10.0 s?

Just wtf'ed me for some reason.
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appianway

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Re: Acceleration
« Reply #1 on: January 04, 2010, 09:56:58 pm »
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If it travels 15 metres in its 5th second of it's motion, it means the difference between the time of the 4th and 5th second was 18 m. Use the relevant kinematic equations, find the difference and solve. Then you can use the acceleration for part b.
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Studyinghard

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Re: Acceleration
« Reply #2 on: January 04, 2010, 10:02:00 pm »
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Quote from: appianway on January 04, 2010, 09:56:58 pm
If it travels 15 metres in its 5th second of it's motion, it means the difference between the time of the 4th and 5th second was 18 m. Use the relevant kinematic equations, find the difference and solve. Then you can use the acceleration for part b.

Sorry, I didnt do any 1/2 and I am doing this all on my own and I have absolutely no idea what the kinematic equations are.

well once it comes up I am sure it will hit me but I am blank as hell.

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appianway

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Re: Acceleration
« Reply #3 on: January 04, 2010, 10:06:54 pm »
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Do you have a textbook?

d=ut + 0.5 * at^2
v^2= u^2 + 2ad
v(av) = d/t = (u + v)/2

Things like that. They're pretty much common sense - you can derive them all from each other.
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Aden

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Re: Acceleration
« Reply #4 on: January 04, 2010, 10:18:38 pm »
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These ones:









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Studyinghard

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Re: Acceleration
« Reply #5 on: January 04, 2010, 10:52:07 pm »
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thanks for help. got another question but il post in the other thread.
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kenhung123

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Re: Acceleration
« Reply #6 on: January 05, 2010, 12:10:14 am »
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Is there something missing here?
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Gloamglozer

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Re: Acceleration
« Reply #7 on: January 05, 2010, 12:14:55 am »
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If it's from the textbook, yes, the writers stuffed up.
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superflya

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Re: Acceleration
« Reply #8 on: January 05, 2010, 12:16:43 am »
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kenhung123

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Re: Acceleration
« Reply #9 on: January 05, 2010, 12:27:41 am »
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Whats it supposed to be?
I am not sure how
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superflya

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Re: Acceleration
« Reply #10 on: January 05, 2010, 12:39:51 am »
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so u begin with

   and u know
sub this back in:


simplify


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kenhung123

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Re: Acceleration
« Reply #11 on: January 05, 2010, 12:44:54 am »
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Isnt a=v^2/r?
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superflya

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Re: Acceleration
« Reply #12 on: January 05, 2010, 12:47:10 am »
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yes, im just showing you how they derive

dont really need to know how its derived, just know how to use the formula :P
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kenhung123

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Re: Acceleration
« Reply #13 on: January 05, 2010, 01:24:43 am »
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How is there constant speed when the net force is 0? What is driving the speed to be constant?
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superflya

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Re: Acceleration
« Reply #14 on: January 05, 2010, 01:31:17 am »
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newtons first law, object will remain at rest or at constant speed unless an unbalanced force acts on it ie. as there are no unbalanced forces ( net force: 0 N) it continues at constant speed.
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