Construct FBDs
http://www.physicsclassroom.com/Physics-Interactives/Newtons-Laws/Free-Body-Diagrams
Force and angle
Effect of friction, air resistance, force on motion of sled
http://www.physicsclassroom.com/Physics-Interactives/Newtons-Laws/Rocket-Sledder
Dot pattern for gravity
http://www.stmary.ws/HighSchool/Physics/home/animations3/gravityIntro5.htm
Goalless problem – dry ice puck hitting spring
https://app.pivotinteractives.com/activities/594d6716df600500116459ef/preview
Change incline, see force to pull up cart to same height
http://www.physicsclassroom.com/Physics-Interactives/Work-and-Energy/Its-All-Uphill
Change heifht of release of cart, measure stopping distance
http://www.physicsclassroom.com/Physics-Interactives/Work-and-Energy/Stopping-Distance
Change densities, see FBD of moving object