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.
|Experiment to determine center of gravity||General||Uganda|
|Aluminum strips don't seem to work||Electroscope||India|
|I want simple projects||Electroscope||India|
|Understanding friction theory||Friction||Nigeria|
|Boiling water in a plastic container||Heat||Nigeria|
|Report on determination of coefficient of static friction||Friction||USA|
|How water affects sound waves||Sound Amplified Over Water||USA|
|How does electroscope detect charges?||Electroscope||USA|
|Experment to produce water waves||Waves||India|
|Making a working model of a coal mine||General||India|
|Use a ruler to make static electricity||Static Electricity||Australia|
|Project idea with plants||Biology||USA|
|Making a self-sustaining power source||General||USA|
|Would like a link for scientific instruments||General||UK|
Experiment to determine center of gravity
July 22, 2013
I WANT AN EXPERIMENT TO DETERNIME THE CENTER OF GRAVITY
WASSWA - Uganda (23880)
See Center of Gravity for an explanation and pictures.
You can then devise an experiment to fine the center of gravity in other objects.
Aluminum strips don't seem to work
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 ..
simran - India (23868)
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.
March 30, 2013
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)
Thanks for the offer. I'd be glad to see some new resources.
I want simple projects
March 3, 2013
i want more best and simple projects
Anshu - India (23517)
We will be adding more project soon.
Understanding friction theory
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)
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.
Boiling water in a plastic container
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)
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.
Report on determination of coefficient of static friction
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)
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.
How water affects sound waves
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)
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.
How does electroscope detect charges?
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)
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.
Experment to produce water waves
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
SMALL PIECES OF PAPER
A WOODEN ROD WITH A HOOK
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)
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.
Making a working model of a coal mine
September 28, 2012
I want to make a working model on coal mines. Please guide me of suggest any other interesting working model.
Anubhav - India (22964)
You can make a model of a coal mine by showing its insides with a frame that has glass or plexiglass to show the tunnels and such. You can use regular dirt, but you must have black material or even coal to show where the workers would be digging.
It would be very difficult to make a working model, since you would need model trains and digging machines inside your model. It is better to show what the inside of a coal mine looks like and then show pictures of what the workers do to get out the coal.
Best wishes in your project.
Use a ruler to make static electricity
September 10, 2012
take a ruler, wipe it on your hair the put it on a small piece of paper,the paper should stay on the ruler
Lena - Australia (22890)
Thanks for the experiment idea.
Project idea with plants
September 5, 2012
I had a science fair idea:
See what difference leaves make for a plant.
I entered it into my science fair at school and won third place. Here's what I did:
Collected two of at least three different kinds of plants from the store (two daisy plants, two geranium plants, etc.)
For each pair, one had its leaves cut off. The other kept its leaves.
Each plant was given same amount of water, sunlight, etc.
Each plant was observed (growth was measured, color was checked, number of blooms was counted) every day.
After a certain amount of time, (at least a week) all data was gathered up and a conclusion was made.
I hope I wasn't too detailed or anything. Hope you like it!
Lily - USA (22881)
That sound like a great idea for a science project. It is also good that you keep conditions the same.
Best wishes for success in your project.
Making a self-sustaining power source
July 15, 2012
Thank you sir for all of this helpful information, I asked for this information because I am attempting to build a Self Sastaining Power Source and the last thing I needed was the materials so again I thank you sir and if u would like I was hopping to start a team to start the building and testing of my model. So if ur interested just give me an email.
Holton - USA (22783)
A self-sustaining power source would require energy from some natural source, such as wind, Sun, geothermal energy, etc. Otherwise, it is considered a "perpetual motion machine", which will not run forever.
The best route in forming a team to help build and even fund your project is to write up plan that explains what you are doing, materials needed, and such. If you want to protect your plans, you can omit vital points or register the plans.
You want people in your own community to help, so check with Science Clubs in high schools or among Physics students in your local colleges. Some may want to join your team. Once a working model is made, you might be able to get outside funding.
Best wishes for success with your invention.
Would like a link for scientific instruments
June 11, 2012
We are a Company supplying Scientific Instruments with an educational site. We would like to promote this site for students and I would like to know if I could place a Banner on your home page with a link to our site
I look forward to your reply
Mrs Nicolette Davis
Manager United Kingdom
Nicolette - UK (22713)
You seem to have a wide array of scientific instruments available for industry. Some may be of interest to teachers and students for their experiments.
I will be updating our Scientific Experiments section soon and can add a link to your company website.
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