(adsbygoogle = window.adsbygoogle || []).push({}); 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?

**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!

# Mechanical energy of sliding beads

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