That would be the indomitable force of friction. Friction is a force that an object encounters as a result of it's surface contacting the other object's surface. Depending on the mass of the two objects, the force of friction can or can not be an impending force to deal with in the movement of the former object. Friction happens because the surfaces, upon microscopic examination, are not really smooth surfaces at all. They are like mini-landscapes, with hills and valleys. The hills and valleys of the two surfaces interlock and create a natural locking mechanism. Depending on how much vertical force is in play (weight, which is dependent upon mass of the two objects), moving one object past the other can be a daunting task. To get an example of what friction is capable of, try rubbing your two hands together rapidly, for say, about 10 seconds. The heat that is generated is a result of the friction between your two hands.
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