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Motion change in position. Reference Point a place or object used for comparison to determine if something is in motion. Relative Motion whether or not an object in motion depends on the reference point International System of Units (SI) system used internationally by all scientists so communication can be clearer. The SI unit to measure length is _______. meter (m) The SI unit to measure volume us _______. liter (L) Speed (unit) distance time. unit: m/s or km/hr Average Speed total distance divided by total time. Instantaneous Speed the speed of an objects at one instant of time Constant Speed speed that doesn't change Velocity speed in a given direction Graphing Motion motion can be shown on a distance U.S. time graph milli- one thousandth kilo- one thousand centi- one hundredth acceleration increasing speed, decreasing speed, or changing direction.