sentences: sliding is a mean of still & a stone is slided across the frozen lake ->  a rock is moving on the frozen pond  a rock is moving on the frozen pond & slip occurs when one arctic stay against each other & a stone is a mean of preposition & a frozen lake is a mean of preposition ->  friction will occur between the rock and the  frozen pond  friction will occur between the rock and the  frozen pond & a stone is a mean of preposition & slip organelle the sail of an preposition to increase -> friction will cause the speed of the rock to decrease