Where do they sell Darth maul force light sabers at Toys R Us?
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Not so much the surface but the factor of friction is what will affect the force needed to drag a box of toys. The equation: where is the force exerted by friction (in the case of equality, the maximum possible magnitude of this force). is the coefficient of friction, which is an empirical property of the contacting materials, is the normal force exerted between the surfaces. In simple terms, the slicker the surface, the less force that is needed to drag the toy box.