A few days ago
Human No.2543324757

Science fair help?

i need some ideas for science project something i can test and write a hypothesis about not just a model(volcano,solar system) and not just wich paper towel absorbs the most water

im in 8th and like robotics,tecgnology and testing chemicals

please post as much detail as you can

(the project have to follow some safety rules,no human test subjects(omg!!!),no toxic chemical,no illegal chemicals,nothing that has to do with DNA or blood,no animal subjects and stuff like that)

Top 3 Answers
A few days ago
Theresa W

Favorite Answer

When I was in 8th grade I tested 3 laundry detergents to see which one got out the ketchup stain the best. You take 3 white cloth diapers (or just one and cut it into three sections). Stain it with ketchup and leave it over night. The next day wash each individual diaper with your choice of laundry soap(s). Then report on your findings. Your hypothesis would something like I think that detergent X will eliminate the stain while detergent Y will be the least effective. I hope this helps.
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A few days ago
RICKY R
Non-newtonian fluid: I found this info on wikipedia.org there is much more info on the web about this stuff. I think it would make a good project. There is several web sites with more info.

A non-Newtonian fluid is a fluid in which the viscosity changes with the applied strain rate. As a result, non-Newtonian fluids may not have a well-defined viscosity.

Although the concept of viscosity is commonly used to characterize a material, it can be inadequate to describe the mechanical behavior of a substance, particularly non-Newtonian fluids. They are best studied through several other rheological properties which relate the relations between the stress and strain tensors under many different flow conditions, such as oscillatory shear, or extensional flow which are measured using different devices or rheometers. The rheological properties are better studied using tensor-valued constitutive equations, which are common in the field of continuum mechanics.

An inexpensive, non-toxic sample of a non-Newtonian fluid sometimes known as oobleck can be made very easily by adding corn starch (cornflour) to a cup of water. Add the starch in small portions and stir it in slowly. When the suspension nears the critical concentration – becoming like single cream (light cream) in consistency – the so called “shear thickening” property of this non-Newtonian fluid becomes apparent. The application of force – for example by stabbing the surface with a finger, or rapidly inverting the container holding it – leads to the fluid behaving like a solid rather than a liquid. More gentle treatment, such as slowly inserting a spoon, will leave it in its liquid state. Trying to jerk the spoon back out again, however, will trigger the return of the temporary solid state. A Cat moving quickly and/or applying sufficient force with their feet can literally walk across such a liquid.

Shear thickening fluids of this sort are being researched for bullet resistant body armor, useful for their ability to absorb the energy of a high velocity projectile impact but remain soft and flexible while worn.

A familiar example of the opposite, a shear-thinning fluid, is paint: one wants the paint to flow readily off the brush when it is being applied to the surface being painted, but not to drip excessively.

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A few days ago
melfluffy
Maybe try something with plants or seeds. Microwave the seeds so many seconds and see if they still grow? Remember to keep the seed up on something in microwave, waves don’t usually bounce and hit flat bottom
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