A force is a "push or pull" acting on an object. There are two main categories of forces: contact forces and action-at-a-distance forces.
Contact Forces
- Applied Force: the force applied to an object by a person or another object
- Normal Force: the force that is exerted on an object that is associated with another stable object
- Friction Force: the force exerted by a surface when an object moves across it
- Air Resistance Force: the force that acts on an object as it moves through the air
- Tension Force: the force that is exerted through a string or rope when it is pulled tight
- Spring Force: the force exerted by a compressed or stretched spring
Action-at-a-Distance Forces
- Gravitational Force: the force with which a very large object attracts another object to itself
- Electrical Force: the force exerted between charged objects
- Magnetic Force: the force exerted between charged objects due to their motion
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