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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