The MythBusters create a massive version of Newton's cradle and try to achieve as high level of efficiency as the small, desktop version.

Sheldon explains how he uses a toy train and a ball to prove Newton's first law of motion. As the train moves, he pushes a button to propel the ball in the air. The ball lands in the same spot on the train where it was propelled. The ball moves at a constant velocity in an inertial frame of reference.

Buster Beaker explains how high and low tides are affected by the gravity of the moon and the sun. He illustrates the phenomenon using a cookie, a mushroom, and a lemon.

Homer slicks the floor with oil in an attempt to injure himself at work. Due to the significantly reduced friction, he stays in motion at the same speed and direction, thus failing to harm himself.

The MythBusters conduct a test at NASA to determine whether a flag on the moon would wave as it does in the video footage of the first moon landing. They find that momentum alone can keep a flag moving in a vacuum; wind is not needed.