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The Strap When the Train Departs (illustration)
FILE No.200Unsolved

The Strap When the Train Departs

Difficulty ★☆☆about 5 minEveryday MysteryInertiaTrains
When a train departs, which way does the hanging strap swing?

Case Record

Your question

When a train departs from the station heading forward, which way does the hanging strap lean: forward or backward?

Case Files

Diagram

Pulling out of the stationInside the train (heading →)Do the straps swing forward or backward?
Diagram

Hints

If you get stuck, open the hints one at a time, in order.

Open hint 1

When the train starts to move forward, what does the strap do?

Open hint 2

It is like the feeling of being pulled backward as a passenger.

Open hint 3

Which way does it lean when stopping?

Solve It

Your question

When a train departs from the station heading forward, which way does the hanging strap lean: forward or backward?

Choose the answer closest to the truth.

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The Truth

Leans backward

The answer is "Leans backward."

When the train starts moving forward, the strap tries to stay still, so relative to the train it is left behind and leans backward.

When stopping it is the opposite, and it leans forward.

The straps tend to stay putInside the train (heading →)AcceleratingThe train moves forward, the straps lag behind → they lean backward.When braking it is the reverse.
Diagram of the solution

Key Points

  • Inertia tries to stay at rest
  • Starting leans backward, stopping leans forward
  • Same as the feeling in your own body

Why people get fooled

Because you think the strap moves in the direction of travel.

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