It's tricky to definitively say which two forces are the "most common" in science because it depends on the context and scale you're looking at.

However, two forces that are incredibly pervasive and fundamental are:

1. Gravity: This is the force of attraction between any two objects with mass. It's what holds us to the Earth, keeps planets orbiting stars, and governs the structure of the universe on a large scale.

2. Electromagnetism: This force governs interactions between electrically charged particles. It's responsible for everything from the electricity that powers our homes to the light we see and the chemical bonds that hold atoms together.

While other forces like the strong and weak nuclear forces are crucial in the nucleus of atoms, they don't affect everyday interactions like gravity and electromagnetism do.

So, while it's not an absolute answer, gravity and electromagnetism are likely the two most common forces in the sense that they have the widest range of influence in the universe.