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Friction Friction The force that two surfaces exert on each other when they RUB against each other Factors The strength of the friction depends on 2 factors How hard the surfaces push together Rubbing hands together Types of surfaces involved Rough vs smooth? More about friction Friction acts a force in the opposite direction as the moving force (opposite directions you subtract) With out friction an object in motion would not stop until another object hits it Types of friction Static Sliding Rolling Fluid Static friction Makes you exert extra force to get an object that is sitting still to start moving It acts as an opposite force Sliding friction ONCE the object is moving this is the friction between the two objects is sliding friction Can be useful to make surfaces less slick Can be hurtful, cause you to slow down, cause things to be destroyed or tear up (skin sliding across blacktop) Rolling friction When an object rolls across or over another surface Easier to overcome than sliding friction for similar objects Fluid friction When a solid object moves (pushes) a liquid aside Easier to overcome than sliding friction This is why parts in machines are covered in oil or grease