# Feedback Q&A on Science Projects

by Ron Kurtus

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

## List of most recent 10 letters

### Country

Friction Overview Mass and movement Canada

Measure Friction with a Scale Procedure for doing experiment Nigeria

Control Mold on Bread Experiment control factor South Africa

General CO2 and photosynthesis experiement Uganda

Resources Thanks for the resources USA

Static Electricity Suggested experiment USA

Measure Volume of Irregularly Shaped Object Amount of liquid in a certain vessel India

Forces Pulling glass sheets and water apart South Korea

Measure Volume of Irregularly Shaped Object Volume of a cone Zimbabwe

General Project resource from student USA

Next 10

## Mass and movement

Topic: Friction Overview

### Question

October 22, 2019

Why is mass not dependent on how object move

29233

Friction is usually greater when the mass or weight of an object in greater.

See the section on Friction for more explanations.

## Procedure for doing experiment

Topic: Measure Friction with a Scale

### Question

February 23, 2019

What are the procedures and precautions required for carrying the experiment of ""determining the coefficient of static friction using the scale pan method""

Favour - Nigeria

28952

The coefficient of static friction is the resistance just before the object starts sliding. You must gradually pull on the object with your spring scale, so that it does not start sliding. You can observe the force on the object by watching your scale indicator.

Of course, if the object slides easily, it may be very difficult to get an accurate reading, so you may have to try several times.

I hope that helps. Best wishes in performing your experiment.

## Experiment control factor

### Question

March 23, 2018

Which graph indicates the control for this investigation

Penelope - South Africa

28483

Pick one factor to vary, keeping everything else constant. You can then use that factor as a control.

## CO2 and photosynthesis experiement

Topic: General

### Question

January 27, 2018

Describe An experiment to demostrate that carbondioxide is necessary during photosynthesis.

Kajingo - Uganda

28406

See The effect of carbon dioxide on plant growth and Experiment to Show that Carbon Dioxide is Necessary for Photosynthesis.

Best wishes for success in your experiment.

## Thanks for the resources

Topic: Resources

### Question

April 13, 2017

My daughter Ava and I just wanted to reach out and say thank you for your Experiments Resources page. Ava has expressed a real interest in (and knack for) science the past couple of years. This year she decided to join the school's science club - a HUGE step for her. She's generally very introverted and shy. My husband and I haven't been successful in getting her to join anything until now.

Since joining the club she's been constantly on the hunt for new science websites and experiments to try. She came across your page and it has been so great for her I wanted to reach out and say thank you. I can't tell you how happy I am that she's found a hobby she loves so much - especially an educational one!

When I told Ava I was going to email you to thank you for your page, she suggested (insisted) I tell you about this other page she loves on "Car Science Experiments." She thought it might be a good addition to your page. I know the science club used one of the experiment ideas on there for rubber band cars or something of that nature - so hopefully you find some use for it too.

Thanks again and enjoy the rest of your week!

Susan - USA

27999

I'm glad that the material has been useful to Ava. It is great that she has found an interest and knack in science and experiments. Her love of science can go beyond a hobby into a great career. And I am sure she will be successful in the things she does.

I added the link for the Car Science Experiments on the Experiments Resources page and included a "thank you" to Ava.

I am sure you are proud of your daughter. Best wishes to her success.

## Suggested experiment

Topic: Static Electricity

### Question

February 18, 2017

In answer to the Cambodia teacher. I taught math/science camp. Retired math teacher. Shred tissue paper up into tiny pieces, use a plastic notebook binder sheet to pick up shreds with static electricity, kids k-12 love the experiment, plus it's cheap. MK BS M Ed. I even had Pre-K students try it.

Martha - USA

27887

Thanks for the suggestion. I'll pass it on.

## Amount of liquid in a certain vessel

Topic: Measure Volume of Irregularly Shaped Object

### Question

February 1, 2017

Hello sir my question is that there is a non uniform vessel which volume is known and there are two valves on it: inlet and outlet. We fill some it with some liquid. Then how do we know how much liquid we filled in with?

praveen - India

27850

The inlet and outlet positions will determine how much liquid can be put in the vessel, according to the height of the lowest valve.

You could fill the vessel until the liquid starts coming out of the output valve. Then pour the liquid into a regular shaped container to measure the volume of the liquid.

It seems like extra work, but that is the best way to do it.

## Pulling glass sheets and water apart

Topic: Forces

### Question

December 30, 2016

Hello. I am currently a high school student in South Korea. I was assigned to conduct a physics research project in school, but I really cannot even get started on solving it. I read some lessons on your website, and I was wondering if you could help me.

The question is: Investigate the various forces involved when you try to separate two sheets of glass separated by a thin layer of water.

So far, I've found that two main forces will work to make separating the glass harder. First is the fact that you have to break the bonds within the film of water to separate the two sheets, and the second is that sandwiching water between the two sheets creates a pseudo- vacuum which means that air pressure will be pressing down in all directions, and that is what makes separating them harder.

Any and all help will be appreciated. You could basically send me a few key terms to help me get my research started, or send me the name of a research paper, or suggest ways for me to get an experiment designed, and have my gratitude forever.

Hojin - South Korea

27725

If you try to pull the glass sheets apart, keeping the surfaces parallel, vacuum areas will be created within the water. Atmospheric pressure will push the glass sheets together. That pressure is much greater than the adhesive bond of the water on the glass.

However, if you pull the glass sheets apart at an angle--almost like peeling them apart--the only forces will be from the water adhering to the glass.

I am sorry, but I don't know of any research papers that you can refer to.

Best wishes for success in your research project. I am sure you will do a great job at it.

## Volume of a cone

Topic: Measure Volume of Irregularly Shaped Object

### Question

July 20, 2016

How can l calculate the volume of cone

Flourish - Zimbabwe

27158

The equation for the volume of a cone is: V = ?(r^2)h/3 where:
-- ? is pi = 3.14
-- r^2 is the radius of the base squared
-- h is the height of the cone

Thus, if the radius of the base was 2 and the height was 6, the volume would be: 3.14 * 2 * 2 * 6/3 = 25.12

## Project resource from student

Topic: General

### Question

July 20, 2016

My name is Jackie, and I'm a summer camp director in Scranton PA. This summer, for the first time, we decided to have a "mad scientist" themed week at camp. Last year we had one fun science day where we made bottle rockets, and it was such a huge hit we decided to kick it up a notch and dedicate an entire week to science this year!

We stumbled upon your page http://www.school-for-champions.com/experiments/resources.htm (thank you google) and it was so helpful to us, I wanted to reach out on behalf of the entire camp and say THANK YOU!:) The same kids that were complaining "I thought this was supposed to be SUMMER why are we doing SCHOOL WORK" were the ones that by Friday were begging me to have another week of science experiments!

One of our campers, Max, let the camp know about another science experiment page he found (he's quite the researcher) called "Science Experiments for All Around Your Home," at http://www.homeadvisor.com/article.show.Science-Experiments-for-All-Around-Your-Home.17372.html . When I told the campers I was going to email you to thank you for your page, Max suggested(insisted) I pass it along to you as a suggestion to add to your resources. Who knew 9 year olds could be so resourceful - and persistent;). Anyway, it is a great resource - my counselors and campers took some awesome ideas from there, so I hope you find use for it too.

Thanks again and have a great summer!

Jackie Campbell

Jackie - USA

27159

Thanks for the comments and the suggested resource. I included the link in Science Project Resources and included a credit to Max.

Best wishes for success in your summer camp.

Next 10

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