Q9 - On a seesaw with sliding

Last updated at September 16, 2026 by

  • 📋 Revise, Reflect, Refine, Q9 (Page 138)
    On a seesaw with sliding seats, a child is sitting on one side and an adult on the other side. The adult weighs twice that of the child. The seesaw however is balanced. Draw a figure which depicts this situation showing the distances from the fulcrum where the child and the adult are seated.
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    Answer
    • For balance — Effort × Effort arm = Load × Load arm
    • Let the child's weight = W, sitting at distance d from the fulcrum.
    • Adult's weight = 2W, sitting at distance L.
      • W × d = 2W × L
      • L = d / 2
    • The adult must sit at half the distance of the child from the fulcrum.
    • GIF Watch: what are the classes of Levers Q9 - On a seesaw with sliding - Work, Energy, and Simp - [Teachoo] - Questions at the end of the chapter
    • Figure description (to draw) —
      • A seesaw balanced on a fulcrum at the centre.
      • Child on the left at distance d (e.g. 2 m) from the fulcrum.
      • Adult on the right at distance d/2 (e.g. 1 m) from the fulcrum.
      • Label — child weight W at 2 m, adult weight 2W at 1 m. W × 2 = 2W × 1 ✓ balanced.
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