Recent content by jhawks8

Sorry for the sloppy tables.

I'm doing a lab for my technical dynamics class and that lab is to determine the coefficient of static friction between a metal washer and both metal and rubber surfaces. I did the experiment using 3 washers set at different distances from the center of the turntable as instructed, and...

Yes, thank you again and I will be on here probably a lot. (Mechanical Engineering major, just starting my physics sequence.)

I was stumped with finding the acceleration, basically getting m to cancel out. And yes, those are correct calculations because my homework is on an online program that automatically grades you.

Thank you very much, that is the help I was looking for. I was able to get an acceleration of -1.25m/s2 and the answer to the question was 2.96m/s.

\sumFx=mgsin20-Fk \sumFy=n-mgcos20=0

I have tried doing that, but I'm just stuck there. The only way I can figure out how to get an acceleration is if n=mg but in this case it does not. Do you care to explain it to me?

That is the part I need help with because after that I believe it is just kinematics. I know that because it is on a slope, n should equal mgcos20, but I am very confused because I don't know what the mass of Johnny is.

Homework Statement Johnny jumps off a swing, lands sitting down on a grassy 20 degree slope, and slides 3.5m down the slope before stopping. The coefficient of kinetic friction between grass and the seat of Johnny's pants is 0.5 What was his initial speed on the grass?