HERE’S A QUICK experiment. Take an object—just about any object will work—and place it on a flat surface. Give it a shove. I don’t think anyone would be surprised to see the object speed up when shoved and slow to a stop afterward.
But it’s not the experiment that’s important. It’s the question:
Why did the block slow down and stop after it was pushed? What force(s) are acting on the block after it was pushed?
Read more at source: What College Physics Students Can Learn from Little Kids | WIRED