2 NON -Contact force or at a distance force ForcesNON -Contact force or at a distance forceContact forceWhen two interacting objects are physically touchingWhen two interacting objects are not touchingExamplesExamplesFictionApplied forceAir resistanceGravityMagnetic forceElectric force
3 Applied Force: A force typical push or pull, pushing a door open, pulling a rope. Friction: Happens when two objects rub against each other. Friction opposes motion.Normal Force: The normal force is the support force exerted upon an object that is in contact with another stable object. For example, if a book is resting upon a surface, then the surface is exerting an upward force upon the book in order to support the weight of the book.Air Resistance: The air resistance is a type of frictional force that acts upon objects as they travel through the air.
4 NON-Contact ForcesMagnetic Force: A kind of non contact force, materials such as iron, nickel, cobalt and other magnets just need to be near the magnet to be attracted or repelled.Electric Force: Noncontact force of electrical charges.Gravitational Force: The force of attraction between any two objects in the universe. All objects have gravitational force. The mass of an object and its distance determines the strength of its gravitational force.