FRICTION, ________________is a force that happens when two surfaces rub against each other., OPPOSITE, Friction acts in ______________ direction of motion., STATIC, _____________ friction is a type of friction that keeps object at rest or at still., SLIDING, _____________ friction is a type of friction when objects slide past each other., ROLLING, _____________ friction is a type of friction when an object rolls over a surface., FLUID, _____________ friction is a type of friction when an object moves through air or water..

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