Before you start
Think it through first
Most popular
Simple-Machine Lab Pick a lever, ramp, pulley, screw, wedge or gear — predict its mechanical advantage, then the effort to move a load. 
Gear-Ratio Drill Read a gear train and predict the output — faster or slower, more or less torque, which way it spins. 
Hydraulic Press Lab Pascal’s law multiplies your force by the piston-area ratio — see why a small push lifts a whole car. 
MachineForge Journey A path through every kit — clear each stop of real practice, then move on. All activities
Build & predict
Simple-Machine Lab Read a machine’s measurements and predict its mechanical advantage — see how it trades distance for less force. Gear-Ratio Drill Predict speed, torque, and direction of a gear train — meet the idler gear that flips direction but not the ratio. Hydraulic Press Lab Push harder and watch Pascal’s law multiply your force — and why the big piston moves less far. Teach the Cast Teach a simple-machine idea to a cast member still learning it — teaching makes it stick.
Practice & play
Concept Kits 16 kits · 400 questions from simple machines to robotics — a hint after a first miss and an explanation every time. Mixed Practice A short round across the kits you have played — brought back to make it stick. MachineForge Sprint Race your OWN best on what you already know. Timer optional, no penalty for a miss. Trick Questions Brain-teasers with a twist — spot why the obvious answer is a trap. MachineForge Duel 2–4 players take turns on one device — same questions, highest first-try score wins. Or open an online room. Progress Your levels, streak, and how each skill area is coming along — saved on this device. Progress report For grown-ups — a private on-device snapshot mapped to the skill areas. Export a CSV or print.
More ways to play
Meet the cast — the characters who teach this
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Pry Lever — push longer to lift heavier; the trade between force and distance -
Hoist Pulley — pull down here and watch it go up there; redirecting force -
Ramp Inclined plane — climb the long slow way; less force, same work -
Spoke Wheel-and-axle — one turn of the hub, many turns of the rim -
Auger Screw — round and round becomes step and step; spiral inclined plane -
Cleave Wedge — push forward and split it apart; force concentrated to a sharp edge -
Pinion A gear train: meshing teeth trade turning-speed for turning-force and pass the motion along, faster or stronger as you choose. -
Flex A spring: bend it to store your push, let go and it gives every bit back — energy held, then returned. -
Lobe A cam: a spinning shape with a bump that turns steady spinning into a repeating push, like a music box keeping a beat. -
Ratchet A ratchet: lets motion go forward freely but locks when it tries to slip back, holding every bit of progress, click by click.
Ensemble stories — the cast together
📚 Books for MachineForge
Browse all books →Same idea, another world
A machine multiplies your effort by a fixed number — a longer lever or a bigger gear ratio — the same fixed ratio behind every proportion. Try RatioRealm → A machine never gives free energy — save force, pay in distance — the same conservation as height turning into speed on a ramp. Try PowerForge →