Just fling the cube around using real-world objects to impact it YOU MUST ENABLE CAMERA FOR PROPER FUNCTIONALITY TouchSensitivity: Farther/Smaller you or object are, higher it should be. Adjust to your liking, not a one size fits all solution, but 70 is one size fits most from my testing.
Based on v3 of my gravity system, most recent version is here - https://scratch.mit.edu/projects/542466685/ you can use this stuff in your own projects without requesting permission, just give credit