Create a path with given blocks to get a ball to fall into a hole.
Changes the conditions on the hills (wet, grassy, and dry) and the speed of the person on the scooter in order to get them to reach the end of the hills.
Push a car on a track, change the type of material that is on the track (ice, vinyl, carpet, etc), and observe how far the car will go.
Select different types of ramps (ice, snow, mud, etc) to see which of them is easiest for a skateboarder to go down. Make a hypothesis about which you think will be the fastest!