4 Revolutionary Riddles

What causes the fog on the rotating turntable to form a swirling pattern, similar to a hurricane?

• The fog is being pushed by a fan.

• The linear speed of the turntable increases further from the center.

• The liquid nitrogen reacts with the water to create a vortex.

• The turntable is tilted, causing the fog to swirl.

What is likely inside the 'mystery cylinder' that causes it to roll a short distance, stop, and then roll again on the ramp?

• It's filled with sand, which shifts its center of mass.

• It contains a heavy weight on a string, allowing it to roll back and forth.

• It has a spring mechanism that propels it forward and then retracts.

• It's hollow, causing it to lose momentum quickly.

If you pull a string tied to the bottom pedal of a stationary bicycle backward horizontally, what will the bicycle do?

• It will move backward.

• It will move forward.

• It will stay in place.

• It will fall over.

Which part of a moving train is always moving backward relative to the ground?

• The top of the wheels.

• The bottom of the wheels (where they touch the track).

• The smoke coming out of the chimney.

• The coupling between two train cars.