science fair project ideas with independent and dependent variables

The number of dependent variables in an experiment varies, but there can be more than one. The difference between an independent vs. dependent variable is how that they relate to the overall study. 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. . In difficult or simple 8th grade science fair projects, the concentration is kept on including scientific methods and experiment designs. Do the same observation each day for a couple of days more. Hang the string from a dowel rod taped to the top of a cabinet. 0000006791 00000 n The controlled variables are using the same car, using the same ramp at the same angle, and letting go of the car without pushing at the same starting point. Observe the ants coming and goings and record your findings. Controlled variables are quantities that a scientist wants to remain constant, and she or he must observe them as carefully as the dependent variables. 0 Explore Concave and Convex Mirrors STEM Activity. Gatorade and Improved Athletic Performance. Put the other in an area that gets only indirect sunlight. Measure its mass with the balance. If you have access to a very cold freezer, you can look at the effects of freeze and thaw cycles. 6th Grade Science Fair Projects The volume of liquid and the material of the penny are both controlled variables in this experiment. We use cookies and those of third party providers to deliver the best possible web experience and to compile statistics. . Design an investigaton using eye color as a dependent variable. Design an investigation using eye color as an independent variable. 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. 7 Best Dependent and Independent Variables ideas. The varying weights are the independent variable, while the number of swings, or periods, is the dependent variable. Independent and Dependent Variable Examples - ThoughtCo When printing this document, you may NOT modify it in any way. How close does a plant have to be to a pesticide for it to work? You will test different surfaces, such as sand paper, floor tile or bare wood, on top of the ramp and measure the time and distance that a toy car travels using at least three trials each. 0000007529 00000 n Helmenstine, Anne Marie, Ph.D. (2021, February 16). This time eye color is the dependent variable, so you have to research things that might affect eye color. 8th Grade Science Fair Project Ideas. 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. This plant experiment studies the effects of different types of lighting on plants such as radishes and leaf lettuce. Reproduction in whole or in part without permission is prohibited. 4. thickness of slime- Another term for this would be viscosity, which . You will change the temperature of the water, so this is the independent variable. Prior to this, she wrote curriculum and business papers in four different languages. You can. The number of seeds that germinate is the dependent variable. The dependent variable is the reduction in the candle's length after 30 minutes. Does relative humidity? independent and dependent variables science project Why just one? Make a ramp with sides to make sure the car stays on the ramp. Temperature of the water measured in degrees Celsius, Amount of sugar that dissolves completely, measured in grams. Either predict what you expect to happen or form a hypothesis, record the data, determine whether it upholds the prediction, and report your findings. How much water flows through a faucet at different openings? And through your studies Equally long? Planning an investigation Identify the variables. Are goldfish water chemicals really necessary or are they an unneeded expense? Fenders: The bicycle either has fenders or it does not, For Good Variables, You Should Answer "Yes" to Every Question. You should be able to use whatever you have in the fridge. Science Fair Project Ideas for Kids, Middle & High School Students, Science Buddies: Variables in Your Science Fair Project. In most cases, the ball will move fastest on the smooth surface, demonstrating the effect of friction on an object's acceleration. The independent variable is the one that is changed by the scientist. Do all brands of diapers absorb the same amount of liquid? 1. What ratio of vinegar to baking soda produces the best. Experiment #2: Compare the rate of voltage change between devices with low, medium, and high current drain. Scientists use the scientific method to design an experiment so that they can observe or measure if changes to one thing cause something else to vary in a repeatable way. Study the simple transfer of energy with the help of this cool physics science project exploring static energy. For example, in the dog experiment example, you would need to control how hungry the dogs are at the start of the experiment, the type of food you are feeding them, and whether the food was a type that they liked. test results, and 62 normalized values of the SMART test values. What types of words do babies learn to speak first? Suzy has been a successful health, fitness and nutrition writer for more than 10 years, and has been published in various print and online publications. The company wants to claim that when an athlete drinks Gatorade, their performance will improve. 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 . The seed size is the independent variable, because nothing in the experiment affects the size of the seeds. 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. 0000001305 00000 n Tie a weight to the end of a 3 1/2-foot string, leaving a 5-inch tail of string so you can add additional weights later in the experiment. 2. The second experiment does not require any more data . Have you identified all relevant dependent variables, and are they all caused by and dependent on the independent variable? Put one in an area that receives lots of direct sunlight. The independent variable is the one that is changed by the scientist. Plant seeds in identical seedling trays, using two trays of unfertilized soil and two seedling trays of fertilized soil, to see which soil helps the seeds germinate faster. Cover the penny in one container with 1/8 cup of water, and the other with 1/8 cup of vinegar. When a scientist performs a test or survey on different groups of people or things, those groups define the independent variable. Well, if you changed more than one variable it would be hard to figure out which change is causing what you observe. What soils best support structures, such as buildings? Chemistry Projects This variable is affected by seed size and other independent variables in the experiment, such as water, light and soil composition. Water both plants the same measured amount and see which grows better. Students get an amazing chance to win exciting prizes from these projects as well. Norwell Public Schools / Overview. Do white candles burn at a different rate than colored candles? "; then, during your feeding experiments you changed both the size of the dog and the time of day the dogs were fed. Teaching About Variables in Science - The Owl Teacher In some experiments, time is what causes the dependent variable to change. After a week, remove the pennies and see which has been cleaned more. QGT1 Business Management Capstone Financial Document Balance Sheet Forecast . Cookies collect information about your preferences and your devices and are used to make the site work as you expect it to, to understand how you interact with the site, and to show advertisements that are targeted to your interests. In this experiment, you'll determine the percentage of large and small seeds that germinate. Also, a little more on Oxidation with this Rust Experiment! Does the color of a crayon affect how long of a line it will write? . The independent variable is the condition that you change in an experiment. Variables in a Slime Experiment: 1. glue solution type of glue, concentration of the solution. Water pressure, or how much the water is "pushing", Growth of the plant, measured by its height, Growth of the plant, measured by the number of leaves, Make measurements of growth for each plant at the same time, The motor should be doing the same work for each test (turning the same wheel, propeller, or whatever), Same type of bike and tires (except for the fenders! Place a heat source -- like a space heater or a bright incandescent light bulb -- directed to warm the air outside the entrance of the ant hill. A variable is something that can change or vary for an experiment to be a success. Do plants react to the presence of other plants? Ideas for Controlled-Variable Science Projects. ", "More stirring might also increase the amount of sugar that dissolves, and different sugars might dissolve in different amounts, so to ensure a fair test I want to keep these variables the same for each cup of water. If you are new to doing science projects and want to know the effect of changing multiple variables, do multiple tests where you focus on one independent variable at a time. water) then it will increase in mass and volume. 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 . The controlled variable must not change during the experiment. 5th grade. The length of the string and the angle of the swing are controlled variables. In science, a variable is any factor, trait, or condition that can exist in differing amounts or types. When you visit the site, Dotdash Meredith and its partners may store or retrieve information on your browser, mostly in the form of cookies.

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