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My Problem is the #120 in this page (someone please edit and rotate this image, bcause i don't know how to rotate it):

http://i.stack.imgur.com/fBn9C.png

It is a regent practice question,any help will be appreciated. My teacher cannot help with my question because she is not that talented.

Physics especially friction is hard for me, so an answer would be a lot of help to me

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I don't see how that question is answerable without some information about the coefficients of friction of glass, 'rough wood', 'smooth wood' and 'polished wood'. – Jerry Schirmer Dec 10 '11 at 22:19
Oh, I didn't see the line about the velocity being constant in all four cases. – Jerry Schirmer Dec 11 '11 at 0:19
Hi victor, and welcome to Physics Stack Exchange! As our FAQ states, "do my homework"-type questions are not appropriate for this site. If you can edit your question to focus on what conceptual aspect of the problem is giving you trouble, then I will be happy to reopen it. – David Zaslavsky♦ Dec 11 '11 at 2:25

closed as off topic by Qmechanic♦, David Zaslavsky♦ Dec 11 '11 at 2:24

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1 Answer

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The question asks:

In which two diagrams is the force of friction the same?

The force of friction is just the horizontal force.

So which two diagrams have the same horizontal force?

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