Question

There are two ways to find how much work is done voercoming friction. One method entails knowing the force overcoming friction. What other calculation could be done to find this wasted work?

Answer 1

Two ways? I can think of more than that. All deal with the concept of energy lost, either as work (force*distance), or as a change in total energy of the objecct (for example, change in KEnergy in slowing due to friction.

Answer 2

One way that I found was knowing the force overcoming friction (Ff). so the equation to fin dthe work would be Wf = Ff * d.. as you said above (force*distance). But what other calculation would you use to find the wasted work without knowing the friction force?

Answer 3

Hmmm.

Change in total energy= workdonebyfriction

Answer 4

okay so this is what i did to find the work done by overcoming friction:
Ff = .9 N
d = .91 m

(Ff x d = Wf --> .9 x .91 = .82 J)

hmm okay so how would you find the work done by friction using that calculation that you just said (change in total energy = work done by friction) if you had the above data?

Answer 5

Do you have the change in velocity during the time period? If so,

Initial KE-FinalKE= work done on friction