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Feedback Q&A on Science Projects

by Ron Kurtus

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

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



List of next 10 letters

Topic

Title

Country

General Experiment to determine center of gravity Uganda
 
Electroscope Aluminum strips don't seem to work India
 
General Experiment resources USA
 
Electroscope I want simple projects India
 
Friction Understanding friction theory Nigeria
 
Heat Boiling water in a plastic container Nigeria
 
Friction Report on determination of coefficient of static friction USA
 
Sound Amplified Over Water How water affects sound waves USA
 
Electroscope How does electroscope detect charges? USA
 
Waves Experment to produce water waves India
 

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First 10 letters


Experiment to determine center of gravity

Topic: General

Question

July 22, 2013

I WANT AN EXPERIMENT TO DETERNIME THE CENTER OF GRAVITY

WASSWA - Uganda

23880

Answer

See Center of Gravity for an explanation and pictures.

You can then devise an experiment to fine the center of gravity in other objects.

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Aluminum strips don't seem to work

Topic: Electroscope

Question

July 17, 2013

With due respect , I beg to say that while making eletro-scope I dealed with a problem .My problem is that while making it can we use aluminum foil strips instead of metal strips .... I tried it several times with aluominum strips ,but no results...
Please help me to make it ..

Thanks..

simran - India

23868

Answer

Thin aluminized Mylar (plastic) strips should work as the foil strips. Aluminum foil may sometimes be too thick to work properly.

See Home Made Electroscopee for some good instructions.

Best wishes with your experiment.

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Experiment resources

Topic: General

Question

March 30, 2013

Hi!

Didn't know if you were taking suggestions for new resources to list on the Resources on Science Projects and Experiments page of your website, but if you are, I recently came across something that might be worth adding. If you're interested in taking a look, let me know and I'll send over the details. If not, then don't worry about it.

Jon - USA

23570

Answer

Thanks for the offer. I'd be glad to see some new resources.

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I want simple projects

Topic: Electroscope

Question

March 3, 2013

i want more best and simple projects

Anshu - India

23517

Answer

We will be adding more project soon.

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Understanding friction theory

Topic: Friction

Question

February 27, 2013

i was give an experiment based on the coefficient of static friction. I'm done with the experiment but writing the theory is what i can't do. Can you help me with the theory based on the experiment(coefficient of static friction )

chibuike - Nigeria

23502

Answer

The equation for friction force is Fr = ¼N. However, the value of the coefficient of friction (¼) is different for static and sliding friction, the with static coefficient being higher.

See Standard Friction Equation for more information.

Also Measure Coefficient of Friction with a Ramp may help you.

I hope this helps you understand the principles. Look at the other Friction lessons for more information.

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Boiling water in a plastic container

Topic: Heat

Question

February 18, 2013

I boiled some water(up to 100C ) in a plastic kettle on a gas cooker and the kettle does not melt. Please explain to me the science behind this process.

Abu - Nigeria

23207

Answer

It is a very clever experiment. The reason the plastic does not melt is because the water absorbs the heat better than the plastic. This means that the temperature of the water and the plastic stays the same as the temperature of the water increases. However, once the water starts to boil, the temperature of the steam can quickly go beyond 100C such that the pastic may start to melt.

This same experiment is often done with a cardboard container over a fire. The cardboard will not burn as the water is heated up.

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Report on determination of coefficient of static friction

Topic: Friction

Question

January 27, 2013

how can we write a report on determination of coefficient of static friction between a cardboard box and a wooden bench?

- USA

23155

Answer

You usually need a spring scale to measure the force required to start the movement of the box. It is better to have some weight in the box, so that the scale will have a reading. Then the coefficient of friction will be the force reading on the spring scale divided by the weight of the box and its contents.

In your report, state your goal, the equipment used, and the steps you take to perform the experiment. Then record a series of readings and take the average results.

I hope this helps you write up your project report.

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How water affects sound waves

Topic: Sound Amplified Over Water

Question

January 8, 2013

My 11 year old son is doing a science project on how water affects the speed of sound and he found this article very interesting. He would like to know if you have any ideas or suggestions on a science experiment he could do to show this information. Unfortunately we live were it is currently winter so all the bodies of water nearby are currently frozen, but any suggestions you may have would be greatly appreciated.

Jennifer - USA

23114

Answer

When sound travels over a body of water, the effect is from the water cooling the air. So, it is not a case of water affecting the speed of sound directly.

Sound should travel faster in ice than in air. If you hit the lake ice with a hammer a distance away and had your ear against the ice, you should be able to hear the difference in sound reaching you. (However, it could be real cold on your ear.)

A similar experiment is done in a large swimming pool by having an ear in the water and the other outside the water, and clicking two objects together.

Of course, for both of these experiments, using microphones to detect the sound would be better, provided you could compare the times.

These ideas may not be practical, but hopefully they'll give you some ideas.

Best wishes for success in his science project.

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How does electroscope detect charges?

Topic: Electroscope

Question

January 4, 2013

What happened to the object when you rubbed the balloon with wool?
How did the device you made detect static electricity?

Sofia - USA

23104

Answer

The wool loses some electrons to the balloon, while the balloon gains negative charges.

The way the electroscope detects the charges involves a number of steps:

When you put the balloon near the electroscope, the charges on the balloon cause the metal end of the electroscope to gain positive charges. This in turn gives the same charge to the leaves and causes them to repel each other.

See Detection of Static Electricity for more information.

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Experment to produce water waves

Topic: Waves

Question

November 15, 2012

GOAL- TO PRODUCE WAVES & STUDY THEIR PROPERTIES

MATERIALS- A 9 VOLT BATTERY
A WOODEN BOARD
A 12 VOLT MOTOR
A RUBBER BAND
A THREAD SPOOL
A STRING
SMALL PIECES OF PAPER
A WOODEN ROD WITH A HOOK
A SWITCH
WIRES

PROCEDURE-
1. TAKE THE WOODEN BOARD AND THEN FIX THE MOTOR AND THE BATTERY ON THE BOARD BY USING THE SWITCH(KEEP THE SWITCH IN A OFF POSITION)
2.NOW TAKE THE THREAD SPOOL AND FIX IT ON THE MOTOR AND TIGHTEN IT BY KEEPING SOME SMALL PIECES OF PAPER(KEEP THE SPOOL ON THE METALIC ROD THAT PEEPS OUT OF THE MOTOR AND THEN TIGHTEN IT)
3.NOW HANG THE WOODEN ROD ON THE SPOOL WITH THE HELP OF A STRING
4.NOW SWITCH ON THE MOTOR , CIRCULAR WAVES WILL BE GENERATED
5.KEEP A SMALL PIECE OF PAPER AND GIVE THE CONCLUSION THAT THE WAVES OF A WATER DOES NOT MAVE FORWARD (INSTEAD ONLY GIVE A UP AND DOWN MOVEMENT)

ROUNAK - India

23037

Answer

Thank you for the information on an experiment to create waves. I will be adding it to our experiments soon.

Best wishes in your science studies.

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Hopefully, this reader feedback has helped provide information about Excellence issues.


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