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THE PHYSICAL EDITION

Magnets and Surprises

A surprising push sends Vince exploring. Turn a magnet, compare a clip with shiny foil, move a little closer, then guide a paper fish with a magnet hidden underneath. Each discovery gives him something new to try.

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Explore the science

Magnetic force without contactPages 1–2

Vince brings one bar magnet near another in a shallow wooden channel. The second bar moves away before the bars touch. Matching poles of the two bar magnets repel. The channel keeps the moving magnet aligned so it cannot simply turn around. Red and blue identify ends; the colours are not the force.

Ask together: What is between the two magnets when one moves away?

Changing which poles facePages 3–4

Vince turns the magnet in his hand end for end. The two bars come together in the channel. Unlike poles attract. Turning one bar changes which ends face, changing the interaction from a push apart to a pull together.

Ask together: What did Vince change before the magnets came together?

Materials respond differentlyPages 5–6

A steel paper clip follows Vince’s magnet. A shiny piece of aluminium foil stays on the table. The ordinary steel clip is strongly attracted; the foil does not visibly follow this magnet. Shiny appearance does not guarantee strong attraction. The picture compares these objects, rather than isolating every difference between them.

Ask together: Which object moved, and which stayed where it was?

A clip behaves differently from another magnetPages 7–8

Vince tries the blue end and then the red end near the same clip. The clip comes to either end. An ordinary initially unmagnetised steel clip can be attracted to either pole. It does not behave like the second permanent magnet in the opening.

Ask together: How is the clip’s response different from the other magnet’s?

Distance and visible movementPages 9–10

The clip rests on the tabletop while Vince holds the magnet farther away. He brings it closer along the table and the clip moves. A nearer magnet can pull strongly enough to overcome friction. A still clip farther away does not show that magnetic force has vanished. The pictured gaps are illustrative, not measured ranges.

Ask together: What changes between the two pictures?

A pull through a thin sheetPages 11–12

Vince moves the magnet just under a dry blue sheet on an open frame. The clip on top follows. A magnet can attract a steel clip through a thin nonmagnetic sheet. Thickness, separation, friction and magnet strength affect whether this setup works.

Ask together: Where is Vince’s magnet while the clip moves?

Using the clip to carry a paper fishPages 13–14

An adult secures the clip to a light orange paper fish while Vince watches. Vince then moves the hidden magnet under the sheet to guide the fish above. The magnet pulls the steel clip, which carries the paper fish. This is a dry paper pond; the fish is not swimming in water.

Ask together: What part of the fish helps Vince move it?

Vince controls the paper puppetPages 15–16

Vince stops moving his hand under the sheet. The clipped paper fish rests above. The fish follows the magnet’s movement through its clip. When Vince stops, friction helps the fish stop too.

Ask together: What happens to the fish when Vince stops?

Sources and evidence

  1. Two bar magnets can push apart with like poles facing and pull together after one is turned end for end so unlike poles face. They need not touch to exert force.

    Brookhaven National Laboratory — Marvelous Magnets
    PDF p1 Background and p2 Part 2 steps 1–3 explicitly compare like/unlike pole attraction and repulsion.

    Only conventional bar magnets with poles at opposite ends; not arbitrary multipole fridge magnets. Red and blue identify ends, not visible force or universal colours. No field-line beams are drawn. A guided sliding setup keeps the released bar aligned; no free stable levitation.

  2. The pictured ordinary steel paper clip is strongly attracted; an ordinary aluminium-foil piece and paper fish do not visibly follow this classroom magnet. Shiny metal does not guarantee strong attraction.

    NASA eClips — Magnets and Metals, student packet
    PDF printed p5 Explore lists paper clip, paper and aluminium foil; pp3/8 distinguish iron screw from aluminium items.

    Brookhaven National Laboratory — Marvelous Magnets
    p1 objectives: test materials and discover not all metals magnetic; material list includes paperclip and aluminium foil.

    Precheck clip: some alloys/coatings behave differently. Do not say all metals stick, all steel sticks, or nonmagnetic materials have absolutely no magnetic response. Foil piece stays on table; moving magnets near conductors can have other effects outside this slow ordinary comparison.

  3. An initially unmagnetised ferromagnetic steel clip can be attracted to either pole of a magnet; turning this magnet does not make that clip repel like another permanent magnet.

    Exploratorium — Diamagnetism, Paul Doherty
    To do, then What is going on paragraph 1: ferromagnetic iron strongly attracted to both poles; contrasts weak paramagnetic aluminium and diamagnetic water.

    Use ordinary initially unmagnetised steel clip, not a second magnet disguised as clip. Do not infer that every object can only attract. No microscopic domain diagram promised.

  4. For a fixed small magnet and clip on a horizontal surface, bringing the magnet sufficiently near can make the clip move when it did not visibly move farther away.

    NASA eClips — Magnets and Metals, student packet
    Printed p5 Explore: adjust the magnet–clip separation so clip stands without contact; attempt to raise clip without touching.

    Exploratorium — Magnetic Shielding, Tien Huynh-Dinh
    To do paragraph 1: a too-weak magnet, thick cardboard or large separation can prevent clips being held; setup matters.

    Illustrated separation is qualitative, not measured range. A stationary clip farther away does not prove zero magnetic force. Visible sliding requires attraction to overcome friction. Exact tabletop setup untried; adult must precheck a smooth level surface and magnet/clip combination.

  5. A magnet can attract a steel clip through a thin nonmagnetic sheet. Moving a nearby magnet underneath can move a light paper fish clipped to it on top.

    NASA eClips — Magnets and Metals, student packet
    Printed p5 Explore: interpose paper or cloth between noncontact magnet and clip; clip remains influenced.

    Exploratorium — Magnetic Shielding, Tien Huynh-Dinh
    To do paragraph 1 and What is going on paragraph 1: clips attracted through cardboard and air, but thickness/strength/separation can defeat the setup.

    The depicted pond is dry paper/thin card, not actual water. Use one thin smooth sheet on an open-bottom frame; magnet just underneath. Heavy fish, thick board, rough surface or weak magnet may fail; test before offering activity. No guaranteed distance or load. This precise fish game has not been physically tried. The adult guide must make dependence explicit; scenes cannot imply all barriers transmit unchanged.

  6. Small high-powered magnets pose serious ingestion hazards; optional shared activity uses large intact age-appropriate encased magnets under adult control, and the adult handles loose clips.

    U.S. Consumer Product Safety Commission — Magnets
    Opening safety text, lines 29–41: ingestion/inhalation hazards, internal attraction and injuries.

    No claim that size or supervision certifies a toy. Follow manufacturer age guidance; no loose strong neodymium pieces or magnetic balls. Adult prepares and accounts for clips; watching is enough. This is an optional invitation, not a validated safety protocol.

Water and Wind

Water and Wind, pages 1–2: Wind moves the pinwheel.

Spread 1 / 12

Wind tickles my cheek. Round goes my pinwheel.

Explore the science

Wind & forcesPages 1–2

Wind moves the pinwheel. Wind is moving air. Vince feels it on his cheek and sees it push the pinwheel's angled blades.

Ask together: What tells you that the air is moving?

Currents & eddiesPages 3–4

Water passes the rock. A leaf circles behind it. Most water passes the rock; some circles back in an eddy. Laminar flow is orderly; turbulence is irregular, mixing motion. A swirl alone cannot distinguish them.

Ask together: How does the leaf move compared with the water passing the rock?

Waves & energyPages 5–6

Waves spread from the stream. The duck bobs. The falling stream makes waves that carry energy outward and make the toys bob. The stream's current also carries toys along. Bobbing and drifting are different motions.

Ask together: What moves up and down? What moves along the pond?

BuoyancyPages 7–8

A duck floats. A pebble sinks. Water pushes upward on both objects. This buoyancy balances the duck's weight, but not the pebble's. The pebble's splash makes the rings on the next spread.

Ask together: Where is each object compared with the surface?

When waves meetPages 9–10

Two wave patterns approach one another. When gentle waves overlap, their heights add, briefly raising or lowering the surface. This interference does not erase the waves; they continue through one another.

Ask together: What might happen where the two patterns meet?

Surface tensionPages 11–12

Tiny dents appear beneath the strider’s legs. Surface tension helps support the strider where its water-repellent legs dent the water. The duck floats mainly by displacing water.

Ask together: What do you notice where its legs meet the water?

Suction & pressurePages 13–14

The duck bubbles, fills and squirts. Squeeze underwater: air bubbles out. Release with the opening submerged: the elastic duck springs back, lowering pressure inside. The surrounding water pressure pushes water in. Squeeze above water: water exits through that same opening.

Ask together: What changes when Vince squeezes and then lets go?

Lift & gravityPages 15–16

A paper plane glides forward and down. The throw starts the plane moving. Airflow around its wings produces lift and turns air downward. Gravity pulls down; drag resists motion. In still air, the plane glides forward and gradually descends.

Ask together: Where might the plane go next?

ViscosityPages 17–18

Milk runs. Honey stretches into a thread. Honey's greater viscosity means greater resistance to flow. It makes a slow thread while milk runs readily. Temperature and pouring method also matter; this snack is an observation, not a controlled test.

Ask together: How do the milk and honey move differently?

Draining & swirlingPages 19–20

Foam curves inward toward the drain. Gravity drives water through the drain. Existing turning motion can become a curved inward flow, traced by foam. Here water travels to the outlet, unlike waves crossing the pond. Not every drain swirls.

Ask together: Can you follow the foam toward the drain?

Scientific observationPages 21–22

Vince sketches what he noticed. Vince records something he noticed. Drawings, marks or words let him return to an observation. He does not need all the answers.

Ask together: Which earlier picture matches one of his drawings?

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