Resistance encountered when surfaces slide against each other. - Friction, Applying force away from oneself. - Push, Applying force towards oneself. - Pull, Interaction occurring when two objects touch. - Contact, Surface texture that increases friction. - Rough, Surface texture that decreases friction. - Smooth, Energy transfer that can occur due to friction. - Heat, Substance used to reduce friction between surfaces. - Lubricant, Gradual removal of material from surfaces due to friction. - Wear, Outer layers of objects that interact with each other. - Surfaces, A push or pull acting on an object. - Force, To produce or create, often referring to heat. - Generate,

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