Homework Help: Wow is there no one to help with physics???

Posted by John on Thursday, February 16, 2012 at 4:35pm.

A crate of oranges weighing 209 N rests on a flatbed truck 2.0 m from the back of the truck. The coefficients of friction between the crate and the bed are μs = 0.41 and μk = 0.20. The truck drives on a straight, level highway at a constant 7.5 m/s.

(a) What is the force of friction acting on the crate?
N

(b) If the truck speeds up with an acceleration of 2.1 m/s2, what is the force of the friction on the crate?
magnitude N

(c) What is the maximum acceleration the truck can have without the crate starting to slide?
m/s2

Wow is there no one to help with physics??? - Ms. Sue, Thursday, February 16, 2012 at 4:40pm
Please have patience, John. You just posted about 11 minutes before this post.

Remember that we are all volunteers and answer questions when we have spare time.

Here's a clue: A busy physics teacher is more likely to help you if you give us some idea what you do and don't understand about the problem.
Wow is there no one to help with physics??? - Anonymous, Thursday, February 16, 2012 at 4:49pm
Sorry

Well i am confused i don't know how to set the problem up to solve for! I don't know whether to use both uK and Us or just one of them :/

Thank you
Wow is there no one to help with physics??? - Ms. Sue, Thursday, February 16, 2012 at 4:51pm
John -- or whatever you call yourself -- please keep the same name for all of your posts.
Wow is there no one to help with physics??? - John, Thursday, February 16, 2012 at 5:04pm
How would you know its all me?
Wow is there no one to help with physics??? - bobpursley, Thursday, February 16, 2012 at 5:06pm
mustatic use when at rest.
Wow is there no one to help with physics??? - John, Thursday, February 16, 2012 at 5:27pm
Thanks bobpursley
Wow is there no one to help with physics??? - John, Thursday, February 16, 2012 at 6:49pm
I got the rest bobpursley but for some reason am not getting the right answer for part b which friction=ma but when i put 209(2.1) the answer isnt right

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