Block of wood pushed up a wooden ramp

Doc Al

Looks OK to me. If this is one of those online systems, they can be picky about significant figures.

The only other thing I can suggest is to do it over including friction. But unless they give you the coefficient, I don't see how you can do that.

talaroue

yeah that was the initial problem. and wood to wood coefficient can be between .25-.60 so i dont see how i could even pick one. Your the man Doc Al! I would be completely lost with out u. Even when I dont get rid of any significant figures til the end i still get 4.430 so... I am just going to email my professor and tell him I did all the work right but it didn't work.

talaroue

There is a second part to this problem that I am going to try using my numbers and see if I can get it right.........

What speed does it have when it slides back down to its starting point?

Doc Al

That second part is trivial if there's no friction, so I suspect that your professor does intend you to include friction. (Which makes sense, else why specify wood on wood?) Perhaps you can email him for the μ he wants you to use.

talaroue

This part isn't working either when i know all of the work is right....If I use the distance it traveled up the ramp which was 7.728 m. mhhm its ok I emailed him

talaroue

yeah I emailed him. I sent him a picture of my work and asked if we were suppose to use friction and that if we are suppose to use it what coefficient does he want us to use. There is no other way that this can be solved can there?

Doc Al

Not that I can see.

talaroue

Ok, I believe you haha. i appreciate everything you helpped me with! I understand where all the numbers come from and how to change them to what i need! I guess it didn't help that we are missing a bit of information! lol