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Reading on force diagrams.
 
www.khanacademy.org is a website that contains many short explanatory videos on a variety of subjects (including physics) that explain concepts and work through examples.
 
www.phet.colorado.edu is a website that contains many interactive science and mathematic simulations and labs which can help facilitate a deeper understanding of difficult concepts.
 
The below link is provided by the NCDPI. It is a big pdf document that has example problems with answers.
 
 
  Thank you to Mr. Schober at Trinity School in New York, NY for providing the following reviews.    
Concept   Key Ideas  Practice Problems
 Constant Velocity  http://modelingphysics.org/constv/keyideas.htm http://modelingphysics.org/constv/practice.htm 
 Constant Acceleration http://modelingphysics.org/consta/keyideas.htm  http://modelingphysics.org/consta/practice.htm 
 Forces
(free particle model) 
 http://modelingphysics.org/freeparticle/keyideas.htm  http://modelingphysics.org/freeparticle/practice.htm 
 Net Force
(Constant Force) 
 http://modelingphysics.org/constforce/keyideas.htm  http://modelingphysics.org/constforce/practice.htm 
 2-D Motion http://modelingphysics.org/2dmotion/keyideas.htm  http://modelingphysics.org/2dmotion/practice.htm 
Circular Motion  http://modelingphysics.org/circularmot/keyideas.htm  http://modelingphysics.org/circularmot/practice.htm 
Momentum  http://modelingphysics.org/momentum/keyideas.htm  http://modelingphysics.org/momentum/practice.htm 
 Energy http://modelingphysics.org/energy/keyideas.htm  http://modelingphysics.org/energy/practice.htm 
Electric Circuits  http://modelingphysics.org/circuits/keyideas.htm  http://modelingphysics.org/circuits/practice.htm 
General Review http://modelingphysics.org/final1/practice.html   http://modelingphysics.org/final1/reviewsolutions.html