If there is friction, speed will usually be slowed down.
Friction will reduce an object's speed.
Friction is independent of speed once an object is moving since faster does not mean more friction.
Friction is a force that opposes motion, so it can slow down an object and affect its speed. In the context of motion and velocity, higher friction can decrease speed, while lower friction can increase speed.
Speed does not affect the force of friction.
You may be thinking of drag instead of friction. Friction between the floor and your foot increases your speed.
Friction is not affected by the speed of motion. The force of friction remains constant regardless of the speed of the objects in contact.
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Friction does not speed up an object; it creates drag and slows it down.
Friction tends to slow down an object's speed by opposing its motion. It transforms the kinetic energy of the object into heat, which dissipates into the surroundings. The greater the friction, the greater the decrease in speed.
Friction always opposes motion, so it can never speed up an object. Friction slows down or stops an object's motion by acting in the opposite direction. To speed up an object, a force stronger than friction, like a push or a pull, is needed.
Fluid friction will vary with speed and the area of contact when referring to air friction or drag. When referring to surface friction then only the area of contact will vary.
If the speed doubles, the work done by friction remains the same. Friction depends on the force between surfaces and the distance they move relative to each other, not the speed.