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"Motion" is the hundredth, and final episode, and also the twentieth and final episode in the fifth season of Disney's Bill Nye the Science Guy. It aired on June 20, 1998.


Bill Nye gets things rolling and then puts on the brakes to demonstrate how things can’t move or stop moving by themselves. Everything needs a push or pull, a force, to make it move or stop. Motion requires force, because as the female voice says in the theme song, Inertia is a property of matter.

Inertia is the tendency for any moving object to keep moving and any object at rest to remain at rest. A skateboard sits there unless you move it. A bicycle doesn’t stop unless you squeeze the brakes. Magicians have been using inertia for a long time. Pulling a tablecloth off a table and leaving the china and silverware intact works because the dishes, forks, and spoons have inertia. They have a tendency to stay right where they are. Yanking the tablecloth applies a force only to the cloth.

The tug doesn’t apply the force directly to the table settings, so they stay put. Things can appear to be moving, when they really aren’t. Sometimes an object might seem to be at rest, even when it is in motion. It’s all relative. Relative motion, that is. How things appear to move depends on how you, or any observer, happens to be moving.

So, if you’re on a bus looking out a window into another bus, and your bus begins to back up slowly, you may think the other bus is moving forward, when really it’s not moving at all. That’s motion in motion. It happens all around us all the time. So get moving watch the Motion episode.

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Bill Nye the Science Guy (Episode list)
Season One: "Flight" • "Earth's Crust" • "Dinosaurs" • "Skin" • "Buoyancy" • "Gravity" • "Digestion" • "Phases of Matter" • "Biodiversity" • "Simple Machines" • "The Moon" • "Sound" • "Garbage" • "Structure" • "Earth's Seasons" • "Light & Color" • "Cells" • "Electrical Current" • "Outer Space" • "Eyeball"

Season Two: "Magnetism" • "Wind" • "Blood and Circulation" • "Chemical Reactions" • "Static Electricity" • "Food Web" • "Light Optics" • "Bones and Muscles" • "Oceanography" • "Heat" • "Insects" • "Balance" • "The Sun" • "Brain" • "Forests" • "Communication" • "Momentum" • "Reptiles" • "Atmosphere" • "Respiration"
Season Three: "The Planets" • "Pressure" • "Plants" • "Rocks and Soil" • "Energy" • "Evolution" • "Water Cycle" • "Friction" • "Germs" • "Climates" • "Waves" • "Ocean Life" • "Mammals" • "Spinning Things" • "Fish" • "Human Transportation" • "Wetlands" • "Birds" • "Populations" • "Animal Locomotion"
Season Four: "Rivers and Streams" • "Nutrition" • "Marine Mammals" • "Earthquakes" • "NTV Top 11 Video Countdown" • "Spiders" • "Pollution Solutions" • "Probability" • "Pseudoscience" • "Flowers" • "Archaeology" • "Deserts" • "Amphibians" • "Volcanoes" • "Invertebrates" • "Heart" • "Inventions" • "Computers" • "Fossils" • "Time"
Season Five: "Forensics" • "Space Exploration" • "Genes" • "Architecture" • "Farming" • "Life Cycles" • "Do-It-Yourself Science" • "Atoms" • "Ocean Exploration" • "Lakes and Ponds" • "Smell" • "Caves" • "Fluids" • "Erosion" • "Comets and Meteors" • "Storms" • "Measurement" • "Patterns" • "Science of music" • "Motion"