Kinetic Marble Roller-Coaster Foam Pipe Loop Dynamics

45 mins Ages 6-12 Indoor

An engaging, screen-free learning activity that builds real-world creativity and critical thinking for kids aged 6 to 12.

• Foam pipe insulation (6 ft lengths, 1/2" or 3/4" inner diameter) (2 tubes)
• Blue painter’s tape (1 roll)
• Glass marbles (3 units)
• Small cardboard catch box (1 unit)
• Utility scissors (1 unit)

→ Slit 6-foot foam pipe insulation lengthwise down the middle with scissors to create two flexible U-channel tracks.
→ Tape the top track high onto a wall or bookcase and bend the bottom into a 360-degree vertical loop.
→ If the marble falls out at the top of the loop, raise the starting drop height to supply enough potential energy to overcome gravity.

Ensure painter's tape does not damage wall paint; supervise small glass marbles around younger siblings.

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Step-by-Step Instructions

Cut two 6-foot foam pipe insulation tubes lengthwise down the center to yield 4 flexible U-channel tracks.

Tape the start of the track 1.5 meters high on a door frame or wall using painter’s tape.

Bend the lower section of foam into a circular vertical loop-the-loop, securing the base firmly with tape.

Release a marble from the peak, adjusting loop diameter and starting height until the marble completes the loop smoothly.

Gravitational potential to kinetic energy conversion Centripetal force in vertical loops Frictional momentum decay