Christmas STEM Challenge – Pulley for the Elf

What is a Pulley?

A pulley is made up from one or more wheels with a rope looped over them to make it easier to lift objects. The more wheels the pulley has the easier it is to lift the load. We designed a very simply pulley system inside a cardboard box, but you could make yours much bigger.

How to make a pulley system

• Thick string or rope
• Small container or bucket if you want to make a bigger version.
• Pulley or Metal loop or ribbon spool. We used this pulley from The Consortium.
• Small objects to lift

How to set up a pulley system

Attach a small container onto the end of a piece of string or rope.

Thread the string through a suspended metal loop or over a pulley. Add enough Christmassy weight to the container so it is hard to lift by hand and pull up using the rope. You’ll need to scale this acccording to how strong your pulley is. Ours is just a model of a pulley rather than a helpful device.

Try again using a ribbon spool instead of a metal ring, is it easier or harder to pull the container upwards this time?

Things to think about

How long does the string/rope need to be?

Is it easier to lift the bucket with or without the pulley?

What would happen if you used thicker or thinner string or rope?

Can you make a larger scale version if you started small?

How would you change your design?

More pulley activities

Can you design a double pulley? Is it easier or harder to lift the object attached?

Try using smooth and rough rope, is one easier to pull than the other?

Links with English

Can you write a list of safety rules the elves should follow if they use a pulley in Santa’s workshop? 

Links to Maths

Place your items in order of how much they weigh, then in order of size. Does the order change much?

More Christmas Science Ideas

Have you seen these STEM Stocking Fillers?

Try these fun Christmas Science Activities or download our FREE Christmas Science eBook.

We like the look of this pulley set too.

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