* Gravity: Every object with mass exerts a gravitational force on every other object. Even seemingly tiny objects are affected by this, although the force might be very weak.
* Electromagnetism: All objects are made of atoms, which have charged particles. These particles interact through electromagnetic forces, which can be attractive (like magnets) or repulsive (like static electricity).
* Strong Nuclear Force: This force holds the nucleus of atoms together, preventing it from flying apart.
* Weak Nuclear Force: This force is responsible for radioactive decay.
Example: Even a seemingly stationary object like a book on a table is subject to multiple forces:
* Gravity: Pulling the book down towards the Earth.
* Normal force: The table pushing up on the book, counteracting gravity.
* Friction: The table surface resisting any sliding motion.
So, the answer is that all objects experience forces, even if they appear to be at rest.
