force, It is a push or pull that can cause an object to move, stop, or change direction., gravity, It is the force that pulls objects toward the center of the Earth., friction, It is the force that opposes motion between two surfaces that are in contact., applied force, It is the force applied by a person or object through direct contact., normal force, It is the upward force exerted by a surface that supports the weight of an object resting on it..

Forces

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