science fair project ideas with independent and dependent variables

If there is a direct link between the two types of variables (independent and dependent) then you may be uncovering a cause and effect relationship. Helmenstine, Anne Marie, Ph.D. (2021, February 16). Do different brands of popcorn leave different amounts of unpopped kernels? Science Fair Project Ideas for Kids, Middle & High School Students, Science Buddies: Variables in Your Science Fair Project. How close does a plant have to be to a pesticide for it to work? 0000000016 00000 n In difficult or simple 8th grade science fair projects, the concentration is kept on including scientific methods and experiment designs. Older students are invited to read more about that in our Water faucet opening (closed, half open, fully open), Amount of water flowing, measured in liters per minute. Place the others across the room from the window. 32. 8th grade science fair projects tend to involve the scientific method and designing an experiment and not making models or explaining processes. The result will usually be that the vinegar cleans the pennies better, demonstrating that a lower-pH solution is better at cleaning discoloration due to oxidation. light? How does the shape of an ice cube affect how quickly it melts? 8th grade science fair projects tend to involve the scientific method and designing an experiment and not making models or explaining processes. What soils best support structures, such as buildings? In most cases, the sugar will dissolve in the warm water faster, demonstrating that warm mediums -- in which the molecules are moving faster -- dissolve a solid faster than cold mediums. Strauch holds a Master of Arts in speech/broadcast journalism from Bob Jones University, where she also served on the faculty of the radio/TV department. A variable is something that can change. You will change the temperature of the water, so this is the independent variable. Please enter a search term in the text box. The controlled variables are stirring each container the same amount and using sugar from the same bag. What plastic wrap prevents oxidation the best? The relation between music and plant growth be studied better by plotting the no. Apr 3, 2020 - Explore Owen Koimburi's board "INDEPENDENT AND DEPENDENT VARIABLES" on Pinterest. If you did not, then other explanations could be given for differences you observe in how much they eat. Does an electric motor turn faster if you increase the voltage? xbbc`b``3 ` c Set up a series of bowls on the table and fill them with different solutions like that of baking soda, vinegar, salt, distilled water, etc. Blow Up A Balloon Using Sugar And Yeast. wind?)? Sometimes you may hear this variable called the "controlled variable" because it is the one that is changed. The controlled variables in this experiment are the type of plant used and the amount of water received. Due to the process of osmosis, i.e., the movement of water molecules through a selectively permeable membrane from an area of high concentration to that of a lower concentration, the bear starts to grow. Is the effect the same at very low soap concentrations as compared with high concentrations? %%EOF However, vinegar, which is actually an acid, can dissolve the candy. Water both plants the same measured amount and see which grows better. The Effect Of Colored Light On Plant Growth Science ProjectIts range is between 380-750 nm approximately. Air temperature is the independent variable and ant activity is the dependent variable in this ant hill experiment. When you visit the site, Dotdash Meredith and its partners may store or retrieve information on your browser, mostly in the form of cookies. The number of seeds that germinate is the dependent variable. Independent Variable: Time (how long each battery operates in a given device), Independent variable: Type of current drain device (as quantified by low, medium, and high), Dependent variable: Voltage (same as experiment #1), Controlled variables: Same as outlined in the table for experiment #1. So you turn the up the lights in Tray #1 (the independent variable) and the tomatoes get bigger (dependent variable). What factors influence the effectiveness of a pesticide (rain? Is the nutritional content of different brands of a vegetable (e.g., canned peas) the same? Science Fair Project Ideas for Kids, Middle & High School Students . This plant experiment studies the effects of different types of lighting on plants such as radishes and leaf lettuce. Note where each plant is when you measure it -- outside, inside in a well-lit window or away from direct sunlight -- and conclude which amount of sunlight helps your plants grow the fastest. On the other hand, its mass and volume decrease when placed in a hypertonic solution (e.g. This is what we are observing and measuring. In some experiments, time is what causes the dependent variable to change. This science fair log book is designed for teachers to walk their class through a demonstration science fair project and then have students use that example to . 0000002580 00000 n Study the simple transfer of energy with the help of this cool physics science project exploring static energy. All rights reserved. However, it doesnt get dissolved as the gelatin is insoluble in water. You might have a belief that someone is in love, but you cannot really be sure, and you would probably have friends that do not agree with you. In science, a variable is any factor, trait, or condition that can exist in differing amounts or types. Check out this big list of Simple Science Experiments for Kids! The ratios of water to sugar and the amount of stirring are both controlled variables in this experiment. It's free to sign up and bid on jobs. Understanding the definition and different types of variables is vital to properly conducting any science experiment. Planning an investigation Identify the variables. There are two parts of this hypothesis, and thus two experiments: Experiment #1: Measure the voltage of fresh AA batteries as they are used in different current drain devices. Or were there no noticeable changes? The dependent variable is the reduction in the candle's length after 30 minutes. The dependent variables are the things that the scientist focuses his or her observations on to see how they respond to the change made to the independent variable. The dependent variable is the amount of sugar that dissolves in each cup of water. Pour milk into the dish, we made ours about 2cm deep. Take two dirty pennies and place them in identical shallow containers that can hold liquid. startxref Independent variables are not affected by the other variables; they are independent of the others. She has taught science courses at the high school, college, and graduate levels. So, you should keep all the other variables the same (you control them) so that you can see only the effect of the one variable (the independent variable) that you are trying to test. The dependent variables must be able to be measured and caused by the independent variable. Plant the same number of small seeds, such as tomatoes. You'll be expected to present data in the form of tables and graphs. These two variables are: independent variable: Something that you choose to change. 0000007529 00000 n What effect does soap in water have on plants? Variables in a Slime Experiment: 1. glue solution type of glue, concentration of the solution. For instance, maybe the little dog eats more because it is hungrier that day, maybe the big dog does not like the dog food offered, or maybe all dogs will eat more wet dog food than dry dog food. The length of the string and the angle of the swing are controlled variables. How long does it take for milk to go bad refrigerated and unrefrigerated? You should have 2 different graphs for the data pertaining to plants growing with and without music on the same graph paper for a good comparative study. An independent variable is what you intentionally change in order to measure the effect of the dependent variable.To measure both of these, you must also have controlled variables: factors that remain consistent throughout every part of the experiment. Let the bowl sit overnight in a place away from direct sunlight. 295 19 2. 0000003038 00000 n How much water flows through a faucet at different openings? Annette Strauch has been a writer for more than 30 years. Pi Day with Apple Pie. Look at ethylene and enclosing a fruit in a sealed bag, temperature, light, or nearness to other pieces or fruit. Does relative humidity? If you have access to a very cold freezer, you can look at the effects of freeze and thaw cycles. . How to Test Algae Growth for a Science Fair Project, How to Tell the Difference Between Alcohol & Alkene in Labs, Quick & Easy Chemistry Experiments for 10th Graders, Science Experiments on the Formation of Crystals With Ammonia, The Best Ways to Make a Homemade Tornado for a Child's Science Project, Discovery Education: Investigation -- Design Experiment, ScienceProjectIdeasForKids.com: Variables: Independent, Dependent, Controlled, Science Experiments on Evaporation for Kids in Seventh Grade, Science Experiment With Rocks That Absorb Water, Science Experiments on Which Colors of Candles Burn the Fastest. Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. All about WGU Capstone Project: Ideas, . In order to succeed in scoring a 4 or 5 on the Science EOG you should c ome to class every day ready to learn and be prepared . To be clear though, for a science fair, it is usually wise to have only one independent variable at a time. 7 Best Dependent and Independent Variables ideas. Did they appear to move faster or slower when warmer? A sports medicine researcher has been hired by Gatorade to test the effects of its sports drink on athletic performance. Reproduction of material from this website without written permission is strictly prohibited. test results, and 62 normalized values of the SMART test values. Experiments also have controlled variables. There are two parts of this hypothesis, and thus two experiments: You can find this page online at: https://www.sciencebuddies.org/science-fair-projects/science-fair/sample-variables-hypothesis. Weight or mass is an example of a variable that is very easy to measure. On trying out the different ideas, you will find that the degree of expansion of the candy depends on the liquid on which it is kept. 1. Does the shape of an ice cube affect how quickly it melts? Browse independent and dependent variables science project resources on Teachers Pay Teachers, a marketplace trusted by millions of teachers for original educational resources. Experimental Design for Advanced Science Projects page. Does it matter what the liquid is (water as opposed to juice or um.. urine)? The ingredients of gummy bears are sugar, water, and gelatin, with little water content. But it doesn't have to be that way. 1. 8th Grade Science Fair Project Ideas. 0000007306 00000 n Water the seeds equally, and place them where . Copyright 2002-2023 Science Buddies. Place the planks at an angle and roll a tennis or golf ball down each plank simultaneously. Can you make Jello using fresh pineapples instead. How does the voltage of an AA battery change over time when used in low, medium, and high current drain devices? Next day, lift the bear from the water with a plastic fork, sieve or screen. There is no such thing as a "love-meter." Observe the ants coming and goings and record your findings. Try some easy projects that use three variables to understand the importance of each variable in an experiment. Analyze the data to determine if one sex blinks more frequently than the other and which one blinks the most. A dependent variable is the factor, or outcome, that will be measured in an experiment. Science Fair Project Guidebook Page 3 It seems that nothing strikes fear in the hearts of students and parents like these three words: science fair project. Beverlee Brick began writing professionally in 2009, contributing to various websites. Do bicycle fenders keep the rider dry when riding through a puddle? Who listens to music the most: Teenagers or their parents? She pointed out that this problem might make a good project for the upcoming science fair. Do all hairsprays hold equally well? Water the seeds equally, and place them where they get equal sunlight so that the only difference between the two is the size of the seeds. Does the color of a crayon affect how long of a line it will write? Equally long? In this experiment, you'll determine the percentage of large and small seeds that germinate. Some of the control variables might be the brand of sunscreen lotion (using the same brand but different SPF ratings), the amount of sunscreen lotion used for each experiment, the type of materials and the type of UV meter used . If I perform this test in low, medium, and high current drain devices, then the rate of voltage drop will be slowest in the low current drain device and fastest in the high current drain device. Ways to Play with an Apple Carton. Observe which ball reaches the ground first. How permanent are permanent markers? ). An independent variable is what you intentionally change in order to measure the effect of the dependent variable.To measure both of these, you must also . Make similar observations as above for each one of them. 0000003495 00000 n Here are several examples of independent and dependent variables in experiments: In a study to determine whether how long a student sleeps affects test scores, the independent variable is the length of time spent sleeping while the dependent variable is the test score. An experiment usually has three kinds of variables: independent, dependent, and controlled. Groups receiving the survey: Teenagers or parents, Amount of time that each person listens to music per day, measured in hours, Ask the question in exactly the same way to each individual. You can. Hang the string from a dowel rod taped to the top of a cabinet. dependent variable: Something that changes in response to changes in the independent variable. Completely immerse the gummy bear in the water. The dependent variable is the amount of sugar that dissolves in each cup of water. Design an investigation using eye color as an independent variable. Teacher location: The teacher is either in the room or not in the room. When sugar dissolves in water, you cannot see any sugar crystals floating in the water or settling on the bottom of the cup when you stop stirring; you'll use these visual indicators to compare how much has dissolved in each cup. . She completed her Master's degree in Nutrition Sciences, also at the University of Georgia. It is the variable you control. Can all controlled variables be held at a steady value during the experiment? Voltage of the electricity, measured in volts, Speed of rotation, measured in revolutions per minute (RPMs), Height of candle, measured in centimeters, at regular intervals of time (for example, every 5 minutes). 313 0 obj<>stream It is called independent because its value does not depend on and is not affected by the state of any other variable in the experiment. Social studies. Helpful in u. 3. ratio of solutions- Examples are: 1 part glue + 1 part borax; 2 parts glue + 1 part borax; etc. The independent variable is the condition that you change in an experiment. Do the same types of mold grow on all types of bread? Science Process Skill: Identifying Variables. For your science fair project, you should change one variable to see what affect it has on another variable. A science fair project is an opportunity to research and learn about things that interest you. How attentive have you been in class these past few weeks? different colored light? "Different water pressure might also cause different amounts of water to flow and different faucets may behave differently, so to ensure a fair test, I want to keep the water pressure and the faucet the same for each faucet opening that I test. This experiment checks whether a particular kind of plant prefers direct or indirect sunlight. Statistics are defined as a field that involves tabulating, depicting, and describing. Use a stopwatch to record how long it takes for a teaspoon of sugar to dissolve in each. water) then it will increase in mass and volume. Independent variable - the variable that is altered during a scientific experiment.. Also, a little more on Oxidation with this Rust Experiment! When conducting experiments, you need to properly note variables to make accurate conclusions. Plant a few large seeds, such as pumpkin seeds. Are night insects attracted to lamps because of heat or light? See more ideas about variables, middle school science experiments, scientific method. Remove the heat source and record the ants activity again. 0000006791 00000 n Time how long it takes to swing back and forth five times. You want to know which brand of fertilizer is best for your plants. Select subjects, half female and half male. Vocabulary: scientific methods, observation, inference, hypothesis, independent variable, dependent variable, constant, and control. 0000000704 00000 n 0000001658 00000 n colorblind? 0000003002 00000 n Fill two identical containers with two cups of water each -- one hot and one cold. Experiment with what rolls faster by covering one of two planks with a smooth lining like shelf paper and thge other with a rough lining like carpet or astroturf. A cut and paste worksheet where they need to arrange the scientific method steps in the. ", "The many variables above can each change how fast a plant grows, so to ensure a fair test of the fertilizer, each of them must be kept the same for every pot. 0000000988 00000 n The time for germination to take place and the height of the seedlings are dependent variables. Does the presence of detergent in water affect plant growth? How does the pH of soil relate to the pH of the water around the soil? is the name given for any part of an experiment that changes. ", "The work that a motor performs has a big impact on its speed, so to ensure a fair test, I must keep that variable the same.". Article was last reviewed on 21st November 2015. Controlled variables ensure that the different elements of an experiment are similar enough that you know what is being changed or tested. trailer Have you identified all relevant dependent variables, and are they all caused by and dependent on the independent variable? Typed reports and posters are the norm (sorry, no handwritten text). Put the other in an area that gets only indirect sunlight. Norwell Public Schools / Overview. "; then, during your feeding experiments you changed both the size of the dog and the time of day the dogs were fed. Experiment #2: Compare the rate of voltage change between devices with low, medium, and high current drain. While a study can use dependent or independent analyses to gather as much data as possible, both variables are important because they can impact the . Can a saturated solution of sodium chloride still dissolve Epsom salts? Which soft drink sprays the most liquid after it is shaken? We used a variety of milks in our science fair project below. The varying weights are the independent variable, while the number of swings, or periods, is the dependent variable. In this case, it would be the size of the tomatoes in Tray #1. of days as the independent variable on a graph paper and the average plant height as the dependent variable. Record how quickly each plant grows by measuring its growth rate with a ruler. Label the unfertilized seedling trays A and B and the fertilized seedling trays C and D. The controlled variables are: same kind of seed, same type of soil, same amount of water from the same source applied at the same frequency, same amount of exposure to the sun, same room temperature and same dew point.

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