Friction is the force that opposes motion between two surfaces in contact. Every time you walk, write, or drive a car, friction is working. Without fr
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Can friction ever help an object move forward?
Yes. When you walk, static friction between your shoes and the ground pushes you forward. Without this friction, you would slip backward. The same applies to vehicle wheels - friction between tires and road accelerates the car forward.
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Why is friction less when something is rolling compared to sliding?
Rolling friction is less than kinetic friction because rolling involves less surface area in contact at any moment, and the surface deformations are smaller. This is why wheels are so efficient for transportation.
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Does friction depend on how fast something is moving?
No, kinetic friction remains roughly constant regardless of speed. The amount of friction depends mainly on the normal force pressing the surfaces together and the nature of the surfaces, not on the speed of motion.
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