Electromagnetic Swing STEM Kit - a pendulum that keeps going, and the far more interesting question of how.

Build the frame, wind the circuit, hang the magnet and set it swinging. It carries on. Not forever, and not for free, but for long enough that everyone who walks past asks what is keeping it moving. The answer is the point of the kit: an electromagnetic coil detects the magnet as it passes and gives it a precisely timed nudge, replacing exactly the energy that friction and air resistance take away each cycle. It is a feedback loop you can watch working.

To be clear about what this is: the energy comes from the power source, not from nowhere. This is a demonstration of electromagnetism and timing, not perpetual motion.

Why You'll Love It:

• The Question It Provokes - A pendulum that will not stop is genuinely arresting, and the moment a child asks why is the moment they are ready to learn about it. Very few science kits create their own curiosity that effectively.
• Electromagnetism Made Visible - A coil, a magnet and a circuit doing something you can see happening in real time. The same principle drives electric motors, maglev trains, induction hobs and the alternator in every car.
• Timing Is Everything - The push has to arrive at the right instant or the swing dies. Understanding why is a proper insight into feedback and synchronisation, and it explains a great deal about how machines regulate themselves.
• Build It, Then Tune It - Adjust the coil position, the magnet gap, the pendulum length. Small changes have visible effects on how well it sustains, which turns the finished model into an experiment rather than an ornament.
• Genuinely Good Science Fair Material - It runs unattended on a table, it draws a crowd, and the explanation is short enough for a child to deliver confidently. That combination is rare in a school project.
• A Mesmerising Object Afterwards - Once built it earns a place on a desk or shelf and keeps working. Most STEM kits get put away after the lesson; this one gets switched on again.
• Focus and Fine Motor Work - Assembling the frame, positioning the coil and getting the circuit connections right. Methodical, screen-free building where precision visibly determines whether the thing works.

Specifications:

• Type: Electromagnetic pendulum STEM construction kit
• Operating Principle: Coil and magnet with timed electromagnetic pulse
• Educational Focus: Electromagnetism, simple circuits, energy transfer, feedback and timing
• Recommended Age: 8 years and up
• Assembly Required: Yes
• Tools Required: None
• Instructions: Illustrated assembly guide included
• Batteries: Confirm with supplier before listing
• Materials: Confirm with supplier before listing
• Number of Pieces: Confirm with supplier before listing
• Assembled Size: Confirm with supplier before listing
• Country of Origin: China

Care and Maintenance:

• Wipe with a dry cloth only. Keep water and cleaning sprays away from the coil, the wiring and the power source.
• Keep the magnet away from bank cards, phones, hard drives, hearing aids and pacemakers.
• Check the coil gap if the swing starts dying out. Nine times out of ten a pendulum that stops sustaining needs the magnet repositioned rather than repaired.
• Keep the connections clean and secure. A loose contact is the usual reason the pulse stops firing.
• Switch it off when not in use and remove the batteries if it will be stored for a while, to avoid leakage damaging the contacts.
• Set it up on a stable surface out of a draught. Air movement across the room is enough to disrupt a finely balanced pendulum.

Important safety information: Not suitable for children under 3 years. Contains small parts, small electrical components and a magnet. Swallowed magnets can attract each other through intestinal walls and cause serious or fatal injury. Seek immediate medical attention if a magnet is swallowed. Adult supervision is recommended during assembly.

A magnet, a coil and a swing that refuses to stop - the kind of build that sits on a desk quietly doing something inexplicable until somebody asks, and then explains itself perfectly.

What's in the box
1 x Set of Precision-Cut Parts
1 x Electromagnetic Coil Assembly
1 x Pendulum and Magnet
1 x Set of Circuit Components
1 x Illustrated Assembly Instructions