In the next steps, you create a ball and add gravity to make the ball drop and hit the planks and then playback the simulation.
To create a ball for the simulation
To add gravity attributes to the ball
When you connect Gravity to the sphere, it automatically makes the sphere an active rigid body. Gravity affects only the object that was selected when you add the Gravity field.
To run the dynamics simulation
The ball falls and collides with the planks, which rotate about the hinge constraint.