You can view the Conceptual Physics "Problem-A-Day" on the website, and receive new problems each day via 
RSS feed or 
@learnconcphyx.
Please note: Daily practice problems will be unavailable June 10 through August 15 while the service goes on hiatus for the summer.
In the meantime, you're welcome to see problems from the archives.
See the solution.
Get free, Daily Practice Problems!
LearnConceptualPhysics tweets a Problem of the Day during the school year, August 15 - June 15. Follow @learnconcphyx on Twitter to be notified of problems.
Enjoy your summer and we'll see you in the Fall!