Science · Stage 4
Investigate: Bones, Muscles and Joints
Feel your own bones and muscles, test how a joint lets stiff bones bend, then measure and record it like a scientist!
✦ Science📘 Stage 4 · S4⏱ ~10 min🧒 Ages 8–9★ Free to start
measure with a tool and record my results in a table or bar chart.
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Kavi the Body Scientist
Kavi presses the arm and feels something hard inside 🦴. "That's a bone — stiff as a stick!" Then Kavi squeezes the soft, squishy part 💪. "And that's a muscle!" Kavi folds the arm at the elbow. "A bone can't bend… so what folds? A joint! Today we won't just look — we'll measure with a tool and record what we find in a table and a bar chart. Let's investigate!"
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What your child will learn
1Feel your bones, muscles and jointsPress and squeeze your own arm! Three things work together to help you move. Tap each one.
2How does a stiff bone bend?Use what you felt to predict. Then tap to check! Tap Next test for more.
3Our elbow-bend chartWe timed 10 seconds and counted how many times each friend could bend their elbow. Then we drew a bar for each. The taller the bar, the more bends!
4How a scientist measures and recordsReal scientists don't just guess — they measure and write it down. Follow the steps, tap each one.
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A peek inside
Kavi presses the hard part of the arm 🦴 and tries to bend it in the middle of the bone. It won't bend! What lets the arm fold?
A bone is stiff and cannot bend. The joint at the elbow lets the two stiff bones fold together.
Try this at home: Is a bone hard or soft?
Ready to play and learn?
Start the free interactive lesson, or print the handout for screen-free play.
Part of Science · Stage 4 · S4 on KAVI Academy — a secular, whole-child learning platform for ages 5–12.