I got a piece of cardboard, leaned it against the couch, and let a toy car roll down while Baby Sunsun watched. Is she a little young for a science lesson on inertia? No, never too young for that.
And she tries to roll the car up the ramp.
Shake it up, align the wheels
I moved the ramp a little higher, and the car rolled a little faster. Woah! Where did it go?