1. The problem statement, all variables and given/known data A 0.5 kg bead slides on a curved wire, starting from rest at point A as shown in the figure. The segment from A to B is frictionless, and the segment from B to C is rough. The point A is at height 6.9 m and the point C is at height 1.6 m with respect to point B. The acceleration of gravity is 9.8 m/s^2 : http://img376.imageshack.us/img376/2720/motion8pj.gif [Broken] the image for this problem is fig.2 If the bead comes to rest at C, find the change in mechanical energy due to friction as it moves from B to C. Answer in units of J. 2. Relevant equations mgh=energy of grav. Force*displacement=diss. energy 3. The attempt at a solution First, I set mgh at point A to mgh at C + diss energy: (.5)(9.8)(6.9)=.5(9.8)+diss. diss=26J the answer above is not right, am i misunderstanding the question?