HELP! (physics hw)

for those math geniuses, i have no idea where to even begin or start on this problem:

A 35kg box rests on the back of a truck. The coefficient of static friction b/w the box (mu s [mu static]) and the truck bed is 0.300.

a) when the truck accelerates forward, what happens to the box? (i'm guessing it stays where it is, doesn't move)
b) Find the max acceleration the truck can have before the box slides backward.

b is what i'm having trouble with, i know all the equations that i NEED to know for this question, it's just that i don't know where or how to even begin this question, it's the last question on this review sheet too (friction). HELP MUA PLEASE!!!!!!

damn the lounge is dead nowadays :( :mad3: anyways, figured it out, i hope:

http://server5.uploadit.org/files/captazad-finshed.JPG

:mad3:

shit dude what kind of rocket science is that:huh:

by my calculations the jello dies out the orange within 3.26 seconds :)

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Originally Posted by Monkeee

by my calculations the jello dies out the orange within 3.26 seconds :)

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nice, thanks for the answer :) Monkeee is the best :01:

@mofos, don't take physics next year (11) it sux0rz lol, take earth science :lol: boring but easy.

@mofos, ever had mr.lee? fuckin hell, he's supposed to be the hardest teacher in our school. that last sentence sounds so wrong.... :sick:

Dude what the hell are you studying?
why the fuck would you wanna know that? :blink:
and it's one of them stupid questions which is unrealistic cos it would also depend on what surface the truck back is and what kind of box and bottom the box is, also whether it's dry or wet and whther the wind is blowing etc, I hate stuff like that, it's so false :frusty:

Sorry, too advanced for me, especially since I only been out of bed for 30 mins :ph34r:

Jonno :cool:

Meh, I used to get kicked out of my Physics lessons so I wouldnt have been any use

I never done physics :huh:

Jonno :cool:

No??

Did you do GCSE's?

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Originally Posted by DanB

No??

Did you do GCSE's?

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Jonno's retarded - of course he didn't

Quote:

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Originally Posted by DanB

No??

Did you do GCSE's?

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Yes,

Maths (c)
English (B somehow)
Media Studies (D)
B-Tec (D)
Science (C)
D+R (E, cos I did'nt write enough design)

Jonno :cool:

You're only a couple of years older than me though, when I did them I got 2 science grades B/B. I had to do the sciences as 3 differnt topics, Biology, Chem and Physics

Quote:

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Originally Posted by Jon L. Obscene

Yes,

Maths (c)
English (B somehow)
Media Studies (D)
B-Tec (D)
Science (C)
D+R (E, cos I did'nt write enough design)

Jonno :cool:

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ha, i'm smarter than you, just :ph34r:

Quote:

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Originally Posted by DarthInsinuate

ha, i'm smarter than you, just :ph34r:

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hee hee so am i

I got

Art - A
Science - B/B
Maths - C
English - C/C
French - C
Geography - D
History - E

:01:

Quote:

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Originally Posted by DarthInsinuate

ha, i'm smarter than you, just :ph34r:

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Most chimps are smarter than me.

@Dan.......I done science, just science, 1 exam for "Science"
Besides, you were forced to chose a language lesson, that law came in for the year below me, we were the last lot not to have to do it.

Oh I forgot I got a E in geography too, also got written on my report card "Does well to find his way home" :(

Jonno :cool:

Quote:

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Originally Posted by Jon L. Obscene

Most chimps are smarter than me.

Oh I forgot I got a E in geography too, also got written on my report card "Does well to find his way home" :(

Jonno :cool:

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:lol: :lol: :lol:



wait, did you call me a monkey? :dry:

Quote:

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Originally Posted by cpt_azad

a) when the truck accelerates forward, what happens to the box? (i'm guessing it stays where it is, doesn't move)
b) Find the max acceleration the truck can have before the box slides backward.

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This depends upon whether Dan is holding the box when the truck moves forward.. Hence the expression "Fell off the back of a Lorry"..


:whistling

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Originally Posted by Rat Faced

This depends upon whether Dan is holding the box when the truck moves forward.. Hence the expression "Fell off the back of a Lorry"..


:whistling

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:lol: :lol:

:shifty:

Quote:

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Originally Posted by DarthInsinuate

wait, did you call me a monkey? :dry:

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I maybe thick as shit on paper, but I still know how to outwit someone ;)

pwned :01:

Jonno :cool:

Jonno, Darth and Dan are smarter than me :unsure:

Quote:

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Originally Posted by Jon L. Obscene

I maybe thick as shit on paper, but I still know how to outwit someone ;)

pwned :01:

Jonno :cool:

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i heard your shit hasn't been very thick recently, a bit runny infact?

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Originally Posted by Arcadia

Jonno, Darth and Dan are smarter than me :unsure:

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:01: go me


That's bad news about Jonno though :P

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Originally Posted by DanB

:01: go me


That's bad news about Jonno though :P

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indeed :unsure:

Quote:

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Originally Posted by DarthInsinuate

i heard your shit hasn't been very thick recently, a bit runny infact?

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So you're taking an interest in my shit? :huh:

You a felcher? :ph34r:

GTF away from me with that straw :dry:

@Acr.....I seriously doubt that dude ;)

Jonno :cool:

Quote:

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Originally Posted by Jon L. Obscene

@Acr.....I seriously doubt that dude ;)

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Maths E
English E
Science D
French G
Geography D
RE D
Art C
D&T Graphics C
ICT C



:unsure:
I’m also wearing odd socks and my shirt inside out :unsure:

lol, you done more subjects than me :lol;

And I ain't even gonna tell you what I'm wearing, but if you wearing that, you look like you're going to a wedding compared to what I'm wearing :lol:

Jonno :cool:

Quote:

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Originally Posted by Jon L. Obscene

lol, you done more subjects than me :lol;

And I ain't even gonna tell you what I'm wearing, but if you wearing that, you look like you're going to a wedding compared to what I'm wearing :lol:

Jonno :cool:

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I'd love to know what you're wearing :flowers:

:dry: Weirdo


:shifty:

http://hometown.aol.co.uk/Jonraddon/scruff.JPG

Jonno :cool:

What grade are you in? my grade 11 physics isn't like that. :blink:

LMAO I'm in grade........hang on lemmie work it out....grade 23 :lol:

Actually that English result I got by cheating :(
40% was poetry and I just wrote down the lyrics for AC/DC Night Prowler, even called it "The Night Prowler" :lol: He graded me good for that :lol:

Jonno :cool:

Quote:

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Originally Posted by Jon L. Obscene

LMAO I'm in grade........hang on lemmie work it out....grade 23 :lol:

Actually that English result I got by cheating :(
40% was poetry and I just wrote down the lyrics for AC/DC Night Prowler, even called it "The Night Prowler" :lol: He graded me good for that :lol:

Jonno :cool:

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what english result. :blink:

http://filesharingtalk.com/vb3/showt...7&page=2&pp=10

:)

Jonno :cool:



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*Test removed

Ike :cool:

Quote:

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Originally Posted by rossco_2004

What grade are you in? my grade 11 physics isn't like that. :blink:

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umm, grade 11 :huh: . It's grade 11 physics (fuck grade 12 science, i'm takin earth science 12 :lol: ) and no, this isn't hard supposedly, it's easy since we're only 2 months in, the "harder" things are yet to come :no: :mad3: .


btw, i wrote my physics test today, i think i did pretty good. the hardest question involved the sun, earth and moon and what the force of gravity is one each of them during an eclipse, i just wrote down NO for that question.

@dan - you are smart :1eye:

@darth - stop hijacking me thread http://hometown.aol.co.uk/Lynne1977uk/th_pokey.gif