(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

The kinetic energy of a system decreases while its potential energy and thermal energy are unchanged. Does the environment do work on the system, or does the system do work on the environment?

2. Relevant equations

W = K1 - K2

3. The attempt at a solution

I got the answer to this question wrong, so I'm having trouble understanding exactly what's going on here (as usual the textbook is of no help, and we didn't cover this explicitly in class...).

Here is what sense I can make in my head, but I just want to make sure I am not making anything up:

The kinetic energy decreases, so we know the final K (K2) is less than the initial K (K1):

W = K1 - K2 and K1 > K2 so W > 0

Since W is positive, the system does work on the environment.

Is this correct logic? How would you have approached the problem? Thanks!

**Physics Forums - The Fusion of Science and Community**

# Understanding Work

Know someone interested in this topic? Share a link to this question via email,
Google+,
Twitter, or
Facebook

Have something to add?

- Similar discussions for: Understanding Work

Loading...

**Physics Forums - The Fusion of Science and Community**