Gallery
Discover apps people built on Collabby by chatting. Run them, then remix to make them yours.
1cm 칸이 몇 개
🟦 넓이가 뭐냐고 물으면 «가로 곱하기 세로»라고 답하기 쉬워요. 하지만 진짜 뜻은 «1cm 짜리 정사각형이 몇 개 들어가는가» 랍니다. 칸을 깔아 세어 보면 곱셈이 왜 답이 되는지 보여요. 가로만 2배로 늘리면 넓이도 2배, 두 방향을 다 늘리면 4배가 되는 것도 직접 확인할 수 있어요. 🔁 그리고 아이들이 가장 많이 틀리는 것 — 1m는 100cm인데 왜 1m²는 100cm²가 아니라 10000cm²일까요? 가로로도 100배, 세로로도 100배라서 100 × 100 이에요. 큰 칸 하나를 확대해 그 안이 또 격자인 걸 보면 «제곱»의 뜻이 잡힙니다. 🎯 마지막은 직접 바꿔 보기. 이 앱도 코드로 만들었어요 · 리믹스해서 부피 단위를 넣어 볼까요?
펼치면 보여요
📦 상자 안에 쌓기나무가 몇 개 들어갈까요? 한 층을 깔고 위로 쌓아 보면 답이 보여요 — 부피는 가로 × 세로 × 높이랍니다. 세 길이를 바꿔 가며 부피가 12가 되는 상자, 정육면체, 밑면이 정사각형인 상자를 직접 만들어 보세요. ✂️ 그 상자를 잘라 펼치면 면이 여섯 개 나와요. 마주 보는 면끼리 크기가 같아서 세 가지가 두 장씩 — 그래서 겉넓이는 «2 × (세 면의 합)» 입니다. 여섯 면이 모두 똑같아지는 순간(정육면체)도, 겉넓이의 수와 부피의 수가 딱 같아지는 상자도 찾아볼 수 있어요. 🎯 마지막은 부피와 겉넓이를 직접 구해 봐요. 이 앱도 코드로 만들었어요 · 리믹스해서 각기둥을 넣어 볼까요?
Heavy Yet Floating
🛟 Two objects weigh the same, but one sinks and the other floats. Why? Change their volume and read the buoyancy numbers to find out—the floating one isn’t simply “lighter.” 📏 Put the same object in fresh water and very salty water. In salt water, only half of it sinks. That’s why people float in photos from the Dead Sea. 🚢 Here’s the big question: a heavy lump of iron sinks, so how can a much heavier iron ship float? Keep the amount of iron the same and change only its shape. Then see what happens as you keep loading it. This app was made with code too · Shall we remix it and add a submarine?
Matter's Fingerprints
⚖️ We have a mystery piece of metal! Weigh its mass on a scale and measure its volume in water to find its density, then check the table to discover what it is. Interestingly, a piece twice as large has the exact same density because density depends on the material, not the amount! 🌡️ Boiling points work the same way. Doubling the amount doubles the boiling time, but the boiling temperature stays at 78°C. Higher heat only makes it boil faster without changing the temperature. 📋 Finally, let's read the table! Knowing melting and boiling points tells us whether a substance is solid, liquid, or gas at any temperature. At -50°C, ethanol is liquid while water is frozen solid. Made with code — remix it to add your own substances!
Squeeze to Shrink
🔽 Add weights on the cylinder and watch the gas shrink in volume! With 2 weights it becomes half, with 3 it becomes 1/3. But multiply pressure by volume, and it always equals 60. Even across 6 steps, this value stays steady with all 12 particles simply squeezed closer together. 🔥 Let's heat it up! Every 20 degrees, volume grows by 2. The particles didn't multiply—they just moved faster to push the piston up. 🎈 Look at real life: a snack bag puffs up on a high mountain, while air bubbles shrink deep underwater. But what about a stiff can near a fire? Its volume can't expand, so pressure spikes instead! Built with code · Remix it to add your own experiments!
Cylinder Volume Playground
Adjust the radius to find the base area (3.14×r×r), stack it up to the height, and challenge yourself to guess the cylinder's volume!
Geometric Similarity: Length, Area & Volume
Change the scale factor k to explore corresponding sides, area ratio k², and volume ratio k³ using grids and cubes!
3D Shapes: Nets, Surface Area & Volume
A playful space to fold and unfold nets, exploring the surface area and volume of prisms and cylinders! (Surface Area = sum of faces, Volume = base area × height)