A pebble is stuck on the rim of a rolling wheel.[br][br]One of these graphs shows the height of the pebble as a function of time.[br][br]The other graph shows the height of the pebble as a function of position along the road.[br][br]Which graph is which? Why do you think so?[br][br][watch an animation by clicking in the lower left hand corner of this window][br][br][color=#ff0000][i][b]What other questions could/would you ask of your students based on this applet?[/b][/i][/color]