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A lever balances when the turning effect on one side equals the turning effect on the other. The turning effect (moment) is force × distance from the fulcrum. So load × load distance = effort × effort distance. This is why a heavier child must sit closer to the middle of a seesaw, and why pushing far from the fulcrum of a crowbar lets a small force lift a heavy rock. To find a missing value, work out the side you know, then divide.
✓ You passed this lesson’s test.
Both sides turn the same — “force × distance from the fulcrum must match on both sides”
Use it for: Seesaw puzzles, science lessons on moments and using a crowbar or a long spanner sensibly.
Check: 200 × 30 = 6000 = 120 × 50 ✓
▶ Watch it animatedWork it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.
🏅 Sign in with Google to earn the 🎯 Seesaw Balancer badge when you pass — and a certificate when you finish all 8 lessons of Part 2 · Forces and machines. You can still take the test without signing in.
Why does it work? When should you use it? Ask in English, मराठी or हिंदी.
Sign in with Google to ask Free — 20 questions a day.
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