1. Contact Forces:
* Pushing/Pulling: Direct contact with the object, like pushing a door open or pulling a wagon.
* Friction: A force that opposes motion between surfaces in contact, like rubbing your hands together.
* Normal Force: The force exerted by a surface perpendicular to the object in contact with it, like a table supporting a book.
* Tension: Force transmitted through a stretched object, like pulling on a rope.
2. Non-Contact Forces:
* Gravity: The force of attraction between any two objects with mass.
* Electromagnetism: Forces associated with electric charges and magnetic fields. This includes:
* Electric force: Force between charged objects.
* Magnetic force: Force between magnets or between moving charged objects.
So, while you can categorize forces as contact or non-contact, there are many specific types of forces within each category.
