What is the effect of friction on motion?

Friction can be defined as the force that opposes the relative motion of solid surfaces, fluids, or elements that collide or slide against each other.

Friction has an enormous influence on the motion of an object as it opposes the motion of an object, causing moving objects to lose energy and slow down. If the friction gets increased, more energy would be needed by the object to keep its momentum otherwise it will slow down.

When objects move through a fluid, like air or water, the fluid exerts a frictional force on the moving object, and the frictional force exerted by the fluid is called a drag force.