Fulcrum Balance
Master the art of leverage! Place weights on the beam to balance torque. 30 physics puzzles await.
Fulcrum Balance is a physics puzzle about torque and equilibrium. Each level gives you a beam resting on a fulcrum and a set of weights (labeled in kilograms). Drag a weight from the tray onto any integer position on the beam; the live torque bar at the bottom shows the total torque on the left vs. right side. The beam balances when total torque is equal on both sides — that is, the sum of (weight × distance from fulcrum) is the same on each side. When balanced, the level is solved and you advance. In later tiers you can drag the fulcrum itself to find the only position where the existing weights balance.
Remember the lever rule: torque = weight × distance, so a heavy weight close to the fulcrum can be balanced by a light weight far away. Read the torque bar after every placement — green means balanced, red means the heavier side is tilting. Click a placed (green) weight to remove it back to the tray if you change your mind. Use the Hint button for the level's intended solution approach, and aim to match the "par" weight count for a 3-star rating.
Yes! Fulcrum Balance is completely free to play in your browser — no download or sign-up needed.
Yes, fully optimized for touch controls — drag weights with your finger just like on desktop.
30 levels across 6 tiers: Beginner, Easy, Fulcrum Shift, Hard, Expert, and Master. Later tiers introduce movable fulcrums and wider beams.
Torque is the turning force a weight creates on the beam — it equals the weight multiplied by its distance from the fulcrum. Equal torque on both sides means the beam stays level.