1. Gravity: This is the force of attraction between any two objects with mass. On Earth, this means that every object is constantly being pulled towards the center of the planet.

2. Normal Force: This is the force that a surface exerts on an object in contact with it, acting perpendicular to the surface. It is a reaction force that opposes the force of gravity, preventing an object from falling through the surface it rests upon.

Important Note: While these two forces are always present, their magnitudes might be very small or even negligible in certain situations. For example, the normal force on a feather floating in the air is very small, while the gravitational force on a massive object like a planet is extremely large.