What is the Relationship Between Work and Friction?

[ellieee]

Homework Statement

how to calculate work done against friction? I saw alot of people suggesting to use the formula involving cosine if I'm not wrong but it's not in my syallbus, so is there another way to calculate it?

Relevant Equations

WD = F x D

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[anuttarasammyak]

Do you consider inclined plane ?

 

[haruspex]

Homework Statement:: how to calculate work done against friction? I saw a lot of people suggesting to use the formula involving cosine if I'm not wrong but it's not in my syallbus, so is there another way to calculate it?
Relevant Equations:: WD = F x D

-

You need to state the whole question or we're just guessing.

 

[ellieee]

You need to state the whole question or we're just guessing.

qn 3c

 

[ellieee]

Do you consider inclined plane ?

refer to qn 3c pls:) not inclined plane

 

[anuttarasammyak]

As you referred WD=F*D
F=11,000 N
D is a distance meter the tractor goes in 5 seconds.

 

[ellieee]

As you referred WD=F*D
F=11,000 N
D is a distance meter the tractor goes in 5 seconds.

oh but the answer is (11 000)(6.0) = 66 000 J though

 

[onatirec]

oh but the answer is (11 000)(6.0) = 66 000 J though

So, what is D?

 

[ellieee]

So, what is D?

oh I was careless and didn't see properly , sorry