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How fast do you have to be to run on water?

By Archie, Elliot, Phoenix, Tyren

Introduction

As you could see in the video, our question is "How fast would the Flash have to go to run on water?" In the Flash TV series, it says the Flash goes 650mi/h or around 1045km/h. But is this statement mathematically correct?

Introduction

THE

MATHS

The Maths

To solve this question we first had to create a few formulas.

Formulas

Formulas

Force & Weight = CdAv2

C is a coefficient depending on foot shape, d is the density of water, A is the area of your foot, and v is your velocity.

This force must equal the weight of the human to keep them above the water surface.

But...

Working out these numbers for a typical human, you only need to go 8.5m/s (compared to Usain Bolt's record of ~10m/s).

But...

But...

Energy

But then, there is the issue of energy. Usain Bolt can run fast enough on flat ground, but you would need to spend more energy to run over water (similar to how running in loose sand is more tiring than running on the road). Trained athletes can achieve an output power of 0.5kWand an average human is closer to 0.2kW. According to the sources, anyone running on water needs 12kW of average output power.

Atomic

Ideas

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Even the Smallest Details!

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The

Flash

Brainstorm

your ideas on the

atomic level

Summary

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