Simply click anywhere and the box will go to your mouse. You can change the friction and gravity using the sliders. Press 1 for physics engine 1 and 2 for physics engine 2 (they behave slightly differently). Note: There's no wall and ceiling detection because I'm too lazy to implement it.
This is a very crude attempt at simulating physics with a box. You can click see inside and add your own objects if you want to but you'll have to add wall and ceiling detection yourself so good luck lol.