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Chaos Physics
Unreal Engine comes with the Chaos Physics system - a light-weight physics simulation solution built from the ground up to meet the needs of next-generation games.
The system includes features such as destruction, networked physics, physical animation, cloth, hair, and flesh simulation, fluids, and vehicles.
You can use the physics system to simulate a variety of physical phenomena in your game like destroying objects during gameplay or simulating how your character’s clothing behaves based on their movement.
Physics also gives you the ability to detect collisions between objects and trace (raycast) for other objects in the world to get more information during gameplay.
Station Example
In this station you can see how simple objects, like these cubes, can be set to simulate physics. To do this, select your object and go to the Physics section in the Details panel and enable the Simulate Physics checkbox.
You can also see how you can use physics constraints to keep objects together while they simulate physics.
You can learn more about physics by reading the Physics documentation.