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Stick & Move (Stick to the Plank in the UK version) is a puzzle in Professor Layton and the Last Specter.

Puzzle

US Version

A man is moving a water jug using a round stick and a long plank.

If the circumference of the stick is 20 cm, how far ahead, in centimeters, would the water jug be after one complete turn of the stick?

This is assuming that the plank, stick, and jug do not slip out of place or get stuck.

UK Version

A man is moving a water jug using a round log and a long plank.

If the circumference of the log is 20 cm, how far ahead, in centimetres, would the water jug be after one complete turn of the log?

This is assuming that the plank, log and jug do not slip out of place or get stuck.

Hints




Click a Tab to reveal the Hint.

US Version

Remember that the stick isn't staying in one spot--it moves forward 20cm in one turn.

Think about what else is moving.

UK Version

Remember that the log doesn't stay in one spot - it moves forward 20 cm in one turn.

Think about what else is moving.

US Version

The position of the plank changes with the position of the stick and vice versa.

What does the man have to do to the plank to make the stick move?

UK Version

The position of the plank changes with the position of the log and vice versa.

What does the man have to do to the plank to make the log move?

US Version

Even as the stick moves forward, it's still rolling toward the back of the plank.

Think about what this means for the final position of the jug.

If it's too hard to imagine, try it out using a round object nearby.

UK Version

Even though the log rolls forward, it's still moving towards the back of the plank. Think about what this means for the final position of the jug.

If it's too hard to imagine, try it out using real objects.

US Version

The plank rests on the stick.

When the stick moves 20 cm along the ground, it slides the plank 20 cm forward at the same time.

Taken together, this is the total distance moved by the jug.

UK Version

The plank rests on the log.

When the log moves 20 cm along the ground, it slides the plank 20 cm forward at the same time.

Taken together, this is the total distance moved by the jug.


Solution

Incorrect

US Version

Too bad!

If the stick is moving, what else must be moving too?

UK Version

Too bad.

If the log is moving, what else must be moving?

Correct

You're on a roll!

US Version

When the stick rolls round, it moves forward 20 cm. The plank also moves 20 cm as it's pushed.

Added together, the jug moves 40 cm.

UK Version

When the log rolls round, it moves forward 20 cm. It also pushes the plank along 20 cm at the same time.

Added together, the jug moves 40 cm.

LS081S

A big thanks to http://professorlayton4walkthrough.blogspot.com

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