"Physics Mod Pro 1165" refers to the (originally by Haubna) for Minecraft version 1.16.5 .
The core appeal of the Physics Mod Pro lies in its ability to strip away the "static" nature of the world. In the vanilla game, breaking a block simply causes it to vanish and drop a miniature item. With this mod installed, blocks shatter into dozens of individual fragments that react to the environment. If you mine a diamond ore at the top of a cavern, the debris will realistically tumble down the stone slopes, bouncing and settling according to gravity and friction.