Alec says the force of gravity is stronger on a piece of paper after it’s crumpled. his classmate, jordan, disagrees. alec “proves” his point by dropping two pieces of paper, one crumpled and the other not. sure enough, the crumpled piece falls faster. has alec proven his point? use at least 2 to 3 complete content related sentences to explain.

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.