Discussion of stability of rope walker with objects suspended to lower center of mass; brief demonstration of rope walker on zip line.

Demonstration that a gallon of water (as well as Professor Lewin) is weightless while in free-fall during a jump off a table. Includes slow motion video of this demonstration.

Demonstration, using a custom-made scale, that a barbell is weightless while in free-fall, then very heavy on impact with the ground.

Explanation of how friction can be eliminated by hydroplaning and air tracks, with brief demonstrations.

Video demonstration of the Vomit Comet and explanation of its cycle and conditions.

Demonstration using a wooden ramp of the dependence of μ_s on surface, but not surface area or mass.

Demonstration of pulley/plane system; additional mass hangs, then falls; explanation of changing friction.

Video of a device that travels on cushion of CO₂ on plate glass; the friction is so low a flea can pull a large book on the device.

Moving two fingers towards each other under a yardstick causes alternating movement.

Newton's third law is demonstrated through a spinning engine propelled by steam.

Demonstration that a gallon of water (as well as Professor Lewin) is weightless while in free-fall during a jump off a table. Includes slow motion video of this demonstration.

Demonstration, using a custom-made scale, that a barbell is weightless while in free-fall, then very heavy on impact with the ground.

Demonstration using a wooden ramp of the dependence of μ_s on surface, but not surface area or mass.

Demonstration of pulley/plane system; additional mass hangs, then falls; explanation of changing friction.

Video of a device that travels on cushion of CO₂ on plate glass; the friction is so low a flea can pull a large book on the device.