# Experiments Feedback

by Ron Kurtus

Readers have sent in a total of 166 comments and questions on Experiments issues. They are listed according to date.

## List of next 15 letters

### Country

Static electricity from a comb Electrical Attraction of a Comb USA

Friction hypothesis Friction UK

How to measure pressure drop Fluids India

Find Q General Nigeria

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

Next 15 letters

First 15 letters

## Static electricity from a comb

November 25, 2015

### Question

will ametal comb after I comb my hair lift paper why

- USA (26563)

A plastic comb will work much better than a metal comb in building up a static electric charge to lift the paper. However, a metal comb may be able to hold charges to lift the paper. See Causes of Static Electricity and other lessons.

A good experiment is to compare the two types of combs to see which works the best.

## Friction hypothesis

November 8, 2015

### Question

what is the hypothesis for this particular experiment.

Jeevikash - UK (26505)

An hypothesis is tentative explanation for an observation, phenomenon, or scientific problem that can be tested by further investigation or experimentation.

With measuring the coefficient of friction by some means, you are really not making a guess explanation. Instead, it is a demonstration of the experimental method.

## How to measure pressure drop

October 31, 2015

### Question

how to measure pressure drop through depth I meter or feet

Yogesh - India (26495)

Although you can show how water pressure increases with depth, you would really need a pressure gauge to measure the different pressures.

## Find Q

June 20, 2015

### Question

Find Q if R = 1m

Joshua - Nigeria (26098)

You need to state what type of experiment you are talking about, as well as to define what items such as "Q" and "R" mean.

Science is about being exact and making sure there are no misunderstandings.

## 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)

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.

## 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)

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.

## What are the different variables?

February 8, 2015

### Question

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)

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.

## 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)

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.

## 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)

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.

## 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)

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

## 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?

Maria - Guatemala (25277)

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.

## 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)

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.

## 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.

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.

## Wants to know about Electrical Engineering

March 24, 2014

### Question

holy - Nigeria (24809)

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.

## Coefficient of friction experiment

March 16, 2014

### Question

Precautions for coefficient of friction experiment

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.

## Misc

Do you have any questions, comments, or opinions on this subject? If so, send an email with your feedback. I will try to get back to you as soon as possible.

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