A curious child turns two connected gears; the small output winds a rope attached to a heavy crate resting on the floor.

Can a tiny fast gear lift a heavy crate?

tap the fast little gear

The little gear whirls when the crank turns. Its spool and rope lead to a crate resting on the floor. The fast spin is easy to see. What will happen when the crate pushes back?

first, zoom in

One meeting point controls both wheels

Each amber tooth meets one teal tooth. Neither wheel can skip ahead at the contact.

count what passes

Tap one tooth-step at a time

One amber tooth passes; one teal tooth passes. The counts stay matched.

change one thing

Fewer teeth means more turns

teal output18 teeth · 1 turn per crank
6 teeth36 teeth

This toy measures turning speed only. The load test is still ahead.

drive the fast pair

One crank turn makes three output turns

move the crank0 crank · 0 output turns
startone crank turn

Now we know the small gear's speed. What happens when a load resists?

now add the load

Two matched cranks get the same push

Same-size crank handle. Same push. Same spool. Same heavy crate. Only the teal output changes: one is small and fast; one is big and slow.

Neither crate has moved yet. Which box can begin the lift?

Same-size crank. Same push. Same spool. Same heavy crate.

Which gearbox gets its crate off the floor?