Physics simulation problem

I'm new in Unity3d. I saw an youtube video, a simple game. Catch falling vegetables. I tried to create something simple like in that game. But, I can't simulate physics property like that video. Also, objects kept passed through collision wall of holder/basket.

ref. video link: here

How can I simulate that type of physics simulation, like in video? Unity's built in physics property seems not that very useful for that kind of work.