* Gravity: This is the force of attraction between the object and the Earth. It pulls the object downwards, towards the Earth's center.
* Normal Force: This is the force exerted by a surface that supports the object. It acts perpendicularly to the surface and counteracts the force of gravity, keeping the object from falling through the surface.
* Friction: This force opposes the motion of an object in contact with a surface. Even if the object isn't moving, there's still a static friction force acting on it, preventing it from moving.
* Air Resistance: This is the force that opposes the motion of an object through the air. Even if the object is still, there's still a small amount of air resistance acting on it.
Important note: If an object is truly still, the forces acting on it must be balanced. This means the forces must be equal in magnitude and opposite in direction. For example, the normal force and gravity must be equal and opposite to keep the object from falling.
Let me know if you'd like to explore any of these forces in more detail!
