# [2014] Scott Fado-Bristow: Dipstick Dave

In Glogpedia

Last updated 6 years ago

Discipline:
Science
Subject:
Experiments
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Why does Dave feel more sting when jumping into a lake during the summer Thermodynamics, a branch of physics/chemistry. Thermodynamics states that the more energy you put into the atoms, or the faster the atoms vibrate, the easier the surface streaches. So the colder liquid is, the harder the surface is to pass through.

Show here is the difference of the atoms at differnt temperatures. At cold tempertures, the atoms are less active, while at higher tempurtures, the atoms are very active.

This graph shows the indirect relationship between the surface tension and temperature. As the temperture increases, the tension decreases.

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This scale is used to measure the surface tension of liquids using the equation F=2sd. F is the force in newtons, 2 is the number of sides the submerged needle, s is the surface tension, and d is the lenght of the needle in meters.

DIPSTICK DAVE

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As shown here, surface tension is whats holds ups water striders and paper clips even though the density is higher than 1. Surface tension is what stops you as you enter the water, making your body lose energy. The more energy you lose, the more pain you feel, for its the sudden stop that kills you, not the fall.

The water striders weight is less then the what the water can hold (the largest water strider requires 0.04 newtons to walk on) allowing it to walk across the water with ease. The Jesus Lizard can run across the water buy using a parralel force to push them across the water.

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The reason why surface tension exists is because the water molecules at the surface do not have as many molecules that are attracted to them as the ones in the center, as displayed by the diagram, so the top layer of molecules share stronger bonds with the molecules next to them.

The video above shows how powerful surface tension is, and that is can take a .50 cal bullet and turn it into shreds. Surface tension is also the reason why from high enough heights, hitting water is just like hitting concrete

Surface tension= mn/m1000 millinewtons= 1 newton

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Surface tension of water is usually measured using millinewtons per meter. For the sake of our experiment, we will be meaureing surface tension using newtons per meter, but we will convert it at the end.