In physics, resultant force is the sum of all forces acting on an object, and friction acts opposite to the direction of motion, causing a moving object to slow down.
Resultant force is the sum of all forces acting on an object. In the absence of a net external force, an object will either move at a constant speed or remain at rest due to Newton's first law of motion. Friction is a force that acts opposite to the direction of motion, causing a moving object to slow down.
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