Ask an Expert (Page 36)

Question about controlling variables in experiment

Ask an Expert Topic Forum: Grades 9-12: Life, Earth, and Social Sciences

Question about controlling variables in experiment Question about controlling variables in experiment Hi, I am considering doing a project on runoff of harmful materials (such as cow dung) into rivers and streams. Specifically, the effectiveness of different plants in absorbing/preventing it reaching the water in the first place. My vague plan for this so far would be a large box on a slight lean, separated into 3 compartments that allow liquid to travel through them. Compartment 1 to pour… Read more

Obstacle Detecting Glasses

Ask an Expert Topic Forum: Grades 9-12: Physical Science

Obstacle Detecting Glasses Obstacle Detecting Glasses Posted on behalf of student --------------------------------------- Hello, can I ask how I would be able to make an obstacle warning sensor glasses that has 3 sensors in total (one for the front, left, and right side)? I've been looking for tutorials on how to make this sort of stuff ... mostly (I have found) glasses that had 1 ultrasonic sensor instead of 3. I have a consultation tomorrow and I know you might not be able to see this… Read more

Model Mass Driver

Ask an Expert Topic Forum: Grades 9-12: Physical Science

Model Mass Driver Model Mass Driver Posted on behalf of student ---------------------------------------- I have been trying to follow one of the tutorials on your website for making a model mass driver: https://www.sciencebuddies.org/science-fair-projects/project-ideas/Elec_p094/electricity-electronics/arduino-mass-driver#abstract. I have been having an issue with having the current actually run through the coil. I have done some troubleshooting, such as directly connecting the coil to the… Read more

Testing Multivitamins (Titration)

Ask an Expert Topic Forum: Grades 9-12: Life, Earth, and Social Sciences

Testing Multivitamins (Titration) Testing Multivitamins (Titration) Posted on behalf of family/student --------------------------------- We got the Orange Juice Titration kit for my daughter’s science fair project and she was attempting to use it for testing of vitamin C in multi vitamins. The idea was to confirm the milligrams on the label to actuals since they’re not regulated by the FDA. One test on a tablet worked with a color change, but two of the ones she used were capsules and… Read more

How Much Weight is needed to break a concrete brick

Ask an Expert Topic Forum: Grades 6-8: Physical Science

How Much Weight is needed to break a concrete brick How Much Weight is needed to break a concrete brick We are doing the experiment where you mix different ratios of Portland cement, sand and water. I made a standard sized brick and we make a bracket to hang weights from the center of the brick to test how much weight is needed to break the brick. The one brick I got up to 225 lbs. hanging from it and it still did not break. I ran out of weights and a place to put the… Read more

Breast Cancer AI Project Recommendations

Ask an Expert Topic Forum: Grades 9-12: Math and Computer Science

Breast Cancer AI Project Recommendations Breast Cancer AI Project Recommendations I just did the project including the weighted KNN and its amazing. I wanted to use it as an inspiration for science fair. What are still the things that I can do to improve the project? Or to fill in a gap in relation to the project? What can i do to level up or do something novel about it? [Administrator note: project:… Read more

simulating toxic water

Ask an Expert Topic Forum: Grades 6-8: Life, Earth, and Social Sciences

simulating toxic water simulating toxic water I have a student that wants to use bioluminescent bacteria as a water pollutant indicator. We are focused on heavy metals, specifically Cu, Cd, and Pb. To create known concentration solutions of each of these metals (I plan to have her start at 1M and do a serial dilution), would I have her use metal salts or is there a better way to toxify the water? Thank you. Re: simulating toxic water Metal salts are definitely the best option! These salts… Read more

shoes for the visually impaired

Ask an Expert Topic Forum: Grades 6-8: Physical Science

shoes for the visually impaired shoes for the visually impaired [b][i]I want to design a shoe for the visually impaired and I plan to make obstacle sensors on the ends of this shoe and a speaker that tells where to go based on obstacles or a sensor with an audible alarm that detects obstacles. What do you think I can do? I also thought about it, could there be a Bluetooth headset that tells where to go with an obstacle sensor? Can you support you? OR WHAT MORE CAN I IMPROVE? OTHER THAN THESE,… Read more

Question about Alka-Seltzer Science: The Effect of Temperature on Reaction Time activity

Ask an Expert Topic Forum: Grades K-5: Physical Science

Question about Alka-Seltzer Science: The Effect of Temperature on Reaction Time activity Question about Alka-Seltzer Science: The Effect of Temperature on Reaction Time activity Type your question below and then press Submit! Who is the scientist that figured out the rate of temperate at which Alka-Seltzer dissolves bye Leave this to help the Experts: The activity can be viewed at:… Read more

Question about Build a Brushbot activity

Ask an Expert Topic Forum: Grades 6-8: Physical Science

Question about Build a Brushbot activity Question about Build a Brushbot activity Type your question below and then press Submit! Are there ideas for this Brushbot? :?: ------------------------------------- Leave this to help the Experts: The activity can be viewed at: [url=https://www.sciencebuddies.org/stem-activities/brushbot]Build a Brushbot[/url] Re: Question about Build a Brushbot activity Hi! The main purpose of this project is to give you a simple look into robotics and get… Read more

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