I have this problem to do and am confused on it. Here is the problem statement, word for word (and the diagram attached):(adsbygoogle = window.adsbygoogle || []).push({});

"The small slider of mass m is released from rest while in position A and then slides alond the vertical-plane track. The track is smooth from A to D and rough (coefficient of kinetic friction, mu_k) from point D on. Dertermine

a) the normal force N_B exertered by the track on the slider just after it passes point B

b) the normal force B_C exerted by the track on the slider as it passes the bottom point C

C) the distance s traveled along the incline past point D before the slider stops.

I think I can do C and probably B, but first I need to know how to do part a. I have no idea where to start. I would think that the normal would be zero since it is vertical..but of course that is where it starts to change direction...

I must use this equation:

sum of the work = change in kinetic energy

Please help me someone

(view attachment for pic)

Sorry for the poor quality.....I had to make it way smaller since the picture can only be so big to upload on this site....the angle is 30 degrees, the radius is R, and the length on the left is 2R

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Work and Kinetic Energy equation

**Physics Forums | Science Articles, Homework Help, Discussion**