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Experiments Feedback

by Ron Kurtus

Readers have sent in a total of 162 comments and questions on Experiments issues. They are listed according to date.

You can read them to further your understanding of the subject.



List of next 15 letters

Title

Topic

Country

First year chemistry lessons General Namibia
 
Finding volume of irregular objects Fluids Ghana
 
What are the different variables? Friction South Africa
 
Using plastic strips in an electroscope Electroscope India
 
Aluminum versus plastic strips in electroscope Electroscope India
 
Wants to make a rubber band powered device General India
 
Science fair project classification General Guatemala
 
When is website updated? General USA
 
Experiment with waterwheel in oil General Barbados
 
Wants to know about Electrical Engineering General Nigeria
 
Coefficient of friction experiment Friction South Africa
 
Measuring weight in water doesn't seem to work Fluids USA
 
Static electricity and hair color Static Electricity USA
 
Questions would help learning Fluids Vanuatu
 
Does fiction depend on area of contact? Friction Philippines
 

Next 15 letters

 




First 15 letters


General

First year chemistry lessons

February 19, 2015

Question

how to carry out accurate and quality first year chemistry 1A ,Introduction to biology and physics practicals in the LABORATORY.

Robson - Namibia (25773)

Answer

See the lessons in Chemistry for the basics. We'll be having Chemistry experiments soon.

Likewise, lessons and experiments in Biology will be coming son.

Best wishes for success in your studies.

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Fluids

Finding volume of irregular objects

February 11, 2015

Question

i send u greetings.my question is, how is the experiment "finding the volume of an irregular objects "important 1).globally
(2).in Education (3).in the world of work.Thank you.

- Ghana (25761)

Answer

A major purpose in wanting to find the volume of an irregular object is to help determine the material that the object is made of.

For example, if you have an irregular object that is supposed to be 100% gold, you can find its volume and compare its weight with the weight of the same volume of gold. If there was some other material mixed with the gold, the weight would be different, proving that it is not 100% gold.

Knowing this method can be important in education, as well as in business.

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Friction

What are the different variables?

February 8, 2015

Question

Dear sir/madam
What would be the dependent, independent and controlled variable for this experiment.
2)What would be the Discussion and analysis of results

Please would you respond to me as quickly as possible, It is very urgent.

Mahd - South Africa (25755)

Answer

An independent variable does not depend on other variables. It is one that you can vary. For example, in measuring the coefficient by sliding the object down a ramp, the angle of the ramp is an independent variable.

A dependent variable is one that depends on other factors. It is one that is observed or measured. For example, the force of sliding friction depends on the coefficient of friction and the normal force pushing the objects together.

Controlled variables are quantities that you want to remain constant and must observe them as carefully as the dependent variables. For example, you can see if changing the weight will change the coefficient of friction.

I hope that helps. best wishes for success in your experiment.

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Electroscope

Using plastic strips in an electroscope

January 29, 2015

Question

sir would you please clear my doubt that whether plastic strip do show repulsion in case of aluminium strip in an electroscope
kindly help me

isha - India (25733)

Answer

The strips or leaves in an electroscope should be thin enough to move from the opposing electrical charges. But also, they must conduct the electrons, so that the charges can collect on the leaves. That is why very thin aluminum or gold foil is used.

The problem with something like plastic is that it does not conduct the electrons, so that they cannot collect on the surfaces.

It is a good experiment to compare an electroscope with aluminum foil versus one with thin plastic strips. You will probably see the plastic strips do a poor job of repelling.

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Electroscope

Aluminum versus plastic strips in electroscope

January 27, 2015

Question

hlo sir plz hlp me
i want to know that when the aluminium strips of electroscope replaced by plastic strip then what will happen?

isha - India (25726)

Answer

If the aluminum strips are very thin, they should work much better than plastic strips. Why don't you try an experiment using aluminum and plastic strips to compare them? That would be a good experiment.

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General

Wants to make a rubber band powered device

January 16, 2015

Question

ok so i have to make some rubber-band powered devices that solve 1 technical difficulty in total and the main force of the device should come from a rubberband and we also cannot use direct manual force.
can you help me??

- India (25705)

Answer

Take a look at images of rubber band powered devices to get some ideas. I hope that helps.

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General

Science fair project classification

August 16, 2014

Question

My name is Maria and I'm doing a science fair project. I'm doing the "Shrinking Styrofoam Cup" which consists of putting a styrofoam cup in an oil pressure. The sure particles, the pressure, and vapor cause the cup to shrink. I have a question, is this physical science: chemistry? Or just physical science: physics?

Reply as soon as possible please :)

Maria - Guatemala (25277)

Answer

It sounds like a good science fair project. It probably could be classified as Physics, since it concerns the properties of the material. But it could also be considered under chemistry since it is changing a material. So, wither one would work.

Best wishes for success in your project.

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General

When is website updated?

August 12, 2014

Question

Hello,
I would like to know when this website was last updated and the author of this website. I couldn't seem to find it anywhere and I need to cite this website for a school science project. If you don't mind, e-mail me back as soon as you can so I can continue with this part of the project. Thank you so much for your time and cooperation.
Regards,

Fallon - USA (25259)

Answer

Each lesson page has a date after the author's name. If the page has been revised, it indicates that.

It is usually better to cite individual subjects, but if you want to cite the whole website, the author is Ron Kurtus and the updates are ongoing.

Best wishes fro success in your science project.

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General

Experiment with waterwheel in oil

May 17, 2014

Question

Hello my name is Shaun Durant and I have a question pertaining to leverage. I'm working on a science project of sorts its a table top model. Basically its an artificial waterfall submerged in a lighter density fluid "oil". I'm attempting to capture the falling water with a waterwheel, however I'm not sure what dimensions will work best since water falls unusually in oil. Is this something your experts can help with? Actually the problem is slightly more complicated, I'd like to send a 30 second video clip of the prototype, this will show exactly what the problem is that I'm having. I've being advise to patent the prototype after its completion, so please, please, be discreet with the video clip. Awaiting your response, thank you for your time.

Shaun - Barbados (24968)

Answer

You really should define the purpose of your project. Is it simply to demonstrate how a waterwheel or paddle-wheel would work in a fluid? Or do you want to find the best size or shape of the waterwheel?

I understand that the water would not fall directly down in oil.

Feel free to send the video in a replay email, and I'll take a look at it. I certainly won't show it to anyone.

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General

Wants to know about Electrical Engineering

March 24, 2014

Question

About electrical engineering

holy - Nigeria (24809)

Answer

Right now we do not have a section on Electrical Engineering. However, our section on Electricity and Magnetism can give you a start on the basics you will need to know.

Best wishes for success in your studies.

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Friction

Coefficient of friction experiment

March 16, 2014

Question

Precautions for coefficient of friction experiment

Adolf - South Africa (24790)

Answer

It is a good idea to perform a friction experiment several times to get an average reading. If you are sliding objects, using a spring scale, you should be slide slowly and regularly.

Adding weight to the object being slid and them comparing calculations helps to get a good value.

You can also try different methods to find the coefficient of friction between two materials.

Best wishes with your experiments and measurements.

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Fluids

Measuring weight in water doesn't seem to work

March 8, 2014

Question

Hello! I am doing this experiment with my first grade son and all of the items are weighing the exact same in and out of the water! We had assumed that they would for sure weigh less in the water when they are sinking and displacing the water above. We have tried heavier objects, larger objects, and other variations and no matter what I use the results are the same: the rock is weighing 4.6 oz on land and 4.6 oz totally submerged in water. Am I missing something? My son badly wants to be a scientist and I don't want to lead him down a wrong path of understanding science just because I'm doing something wrong! He wanted to do this due to his curiosity of why he can lift his brother in the pool but not on land. ANY help would be so much appreciated!

Megan - USA (24589)

Answer

The best way to weigh the rock is to hang it by some string from a spring scale or something similar both in air and in the water. There should be a difference in weight. Otherwise, I'm not sure why you are getting the same weight in and out of the water.

I will have to add a drawing to the experiment to clarify the method.

It is good that your son is curious, because that it the first step in becoming a scientist.

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Static Electricity

Static electricity and hair color

November 30, 2013

Question

My name is Mrs. Latoya Bush, I have a nine year old daughter who is doing a science fair project on static electricity and hair color, and would like to get information and use it for as a resource.
1. can you please explain static electricity?

Johnae - USA (24235)

Answer

See Controlling Flyaway Hair from Static Electricity for information about the subject. Your daughter should be able to understand the material.

By brushing or combing a person's hair with a plastic comb, you can create static electricity. Red hair is usually very fine and results in flyaway hair more that thicker hair, such as black hair.

I hope that helps. Best wishes on her project.

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Fluids

Questions would help learning

November 1, 2013

Question

this experiment is very good and it works. do you think that this will help the students if there are no questions that will contribute to the students learning and understanding? Excuse my poor English

kathrian - Vanuatu (24160)

Answer

Thank you for your suggestion. I will be adding questions and answers to the various experiments, in order to help the students learn and understand the material.

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Friction

Does fiction depend on area of contact?

July 24, 2013

Question

Does frictional force depend on the area of contract?

Roberto - Philippines (23884)

Answer

For hard flat surfaces, the resistance force of friction is independent of the area of contact. See Standard Friction Equation for information.

However, most surfaces are not perfectly flat or hard. Variations will result in area of contact having a contribution.

Studying how friction varies with pressure, area, and flatness would be a good set of experiments.

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