Hi Elizabeth,
I am wondering how you are doing and if you found the resources you needed to better grasp the concepts in your force and motion unit. If you are still looking for some additional support, I highly recommend the Dr. Robertson "Stop Faking It" series. His book on Force and Motion is excellent. http://common.nsta.org/resource/?id=10.2505/9780873552097
(Nanette mentioned the series; this is the book in that series that addresses forces and motion.)
It is written so one can interact with the text by doing simple investigations at home that Dr. Robertson uses to model each concept.
Let us know how your unit went.
Best,
Carolyn