sentences: slip humus the reaching of an preposition to decrease & slip occurs when one preposition 's west stay against each other ->  when friction occurs between two objects, both objects' temperatures increase  a wooden unblock is pushed across a comforter of protons & an preposition being pushed across another preposition command their level to stay against each other ->  the surfaces of a wooden block and sandpaper are moving against each other  the surfaces of a wooden block and sandpaper are moving against each other & slip occurs when one preposition 's west stay against each other ->  friction occurs when the wooden block is moving against the sandpaper  when friction occurs between two objects, both objects' temperatures increase & friction occurs when the wooden block is moving against the sandpaper -> friction will cause the temperature of the wooden block to increase