6 October 2017
The Fountain of Fizz - Physics in the Soda Pop Geyser
Step 1: determine and record the mass of the demonstration ingredients before the demonstration. The ingredients are the 2- liter bottle of soda pop and the Mentos (seven Mentos seems to work well).
Initial Mass: 2 liters/ 2050 g
Step 2: Prepare the eruption in an open, outdoor space where splashing diet soda pop will not create a problem.
Step 3: Prepare the height- measuring mechanism so that it can be used to determine the height of the eruption. We also discuss several other topics like How to define animal science?
Step 4: Prepare to measure the duration of the eruption. That is, you will start timing when the fizz first emerges from the bottle and stop timing when the column of fizz collapses.
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Step 5: When preparations are complete, activate the demonstration and observe the height and time of the eruption.
Maximum Height of Eruption: 27 in
Time of Eruption: after 6 s
Step 6: Measure and record the mass of the ingredients (Mentos, soda pop, and bottle) that remain after the eruption has concluded.
Final Mass: 453 g
1. What type of energy (kinetic or potential) does the fizz have when it emerges from the bottle on its way up?
The fizz has kinetic energy when it comes out of the bottle. 2. What type of energy does the fizz have when it reaches the top of its flight and is about to come back down?
At the height of the eruption, the fizz has potential energy. 3. How much mass was ejected from the bottle during the eruption?
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~ 1597 g
4. Assume that all the mass ejected in the eruption rose to the maximum height measured during the demonstration. Calculate the potential energy of all the fizz at that height. (Start by writing the equation for potential energy. PE= m*g*h
5. According to the principle of conservation of energy, the potential energy of the fizz at the top of the flight is equal to the kinetic energy of the fizz when it emerges from the bottle. Write the equation for the kinetic energy of an object in terms of its mass and speed.
6. Rearrange the equation to solve for the speed of the soda pop as it emerges from the bottle.
KE= 1/2*1,597*20.25 Don't forget about the age old question of What are the two basic classes of property?
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KE= 16,169.63 J
7. Power is the rate at which work is done or energy is transformed. That is, POWER= ENERGY/TIME. Use the energy found above and the time measured during the demonstration to calculate the power developed in the eruption. P= 16,169/6
P= 2,694.82 W