Homework Help: mechanics_ physics

Posted by precious on Sunday, January 6, 2013 at 1:25am.

A trolley is use in pushing a book 1.20m along a horizontal table top with a horizonta force of 3.0N. The opposing force of friction is 0.6N.
1. How much work does his 3.0N force
2.what is the work done on the book by the friction? The total work done on the book

pls indicate formular

mechanics_ physics - Elena, Sunday, January 6, 2013 at 4:40am
F=3 N, F(fr) =0.6 N
W(F) =F•s=3•1.2 =3.6 J
W(fr)=F(fr) •s=0.6•1.2=0.72 J
W(total)=W(F) –W(fr)=…

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