Force and motion webquest works well as a good review, reinforcement, or introduction. I used this with my 7th grade science classes, took most students 60min to complete.
Two sided sheet I used as an online activity to have students research and explore forces and motion. There is also a roller coaster online builder that allows students to create their own coaster then see what works good and any problems that might cause it to fail.
Items included are as follows
Newton's 3 laws of motion
What a force is
What motion is
Normal, applied, frictional, tension, spring, and resisting forces.
Main website used is http://idahoptv.org/sciencetrek/topics/force_and_motion/index.cfm
So please check it before buying.
If the roller coaster website is no longer working please tell me ASAP.
(the roller coaster simulation will work on chromebooks if you click on the enable flash popup. I used this with my classes on chromebooks)