Quiz About Variables And Constants

Variables are anything that can change or be changed in an experiment. In scientific experiments, variables are manipulated or measured to observe their effects on the outcome. They can include factors such as time, temperature, concentration, or any other element that may have an impact on the experiment. By controlling and manipulating variables, scientists can analyze and understand the relationship between different factors and their effects.

In the given table, the variables listed are "Speed of ball," "distance ball rolls," "type of ball," and "color of ball." The independent variable is the one that is manipulated or controlled by the experimenter. In this case, the experimenter is likely changing the type of ball to see how it affects the other variables. Therefore, the independent variable in this table is "type of ball."

In order for an experiment to be valid, the constants must remain the same. Constants are the factors or conditions in an experiment that are kept consistent throughout, so that any changes observed can be attributed to the independent variable. By keeping the constants unchanged, it ensures that any observed effects or changes in the dependent variable are solely due to the manipulation of the independent variable, making the experiment valid and reliable.

The students kept some variables the same in order to ensure that the experiment was valid. By controlling variables such as the time of day, size of the cars, and type of interior, the students were able to eliminate potential confounding factors that could affect the temperature readings. This allowed them to accurately compare the temperatures inside the different colored cars and draw valid conclusions from their experiment.

The dependent variable is the variable being measured that may change when the independent variable is changed. In this case, the number of eggs laid by the chickens is the dependent variable because it is being measured and it may change depending on the independent variable, which is not specified in the given information.

The independent variable in this scenario is the different insecticides. The farmer is testing the effect of using different insecticides on the quality of his corn crop. By using different insecticides, he is manipulating the variable to see how it affects the crop's marketability and ultimately his financial losses. The independent variable is the factor that the farmer is changing and controlling in the experiment.

The experimenter is changing the amount of food the chickens will eat, which means they have control over this variable. This variable is called the independent variable because it is the variable that is manipulated or changed by the experimenter.

The dependent variable in this graph is distance. The graph is showing the relationship between distance and another variable, likely either force, time, or mass. The phrase "DRY MIX" is a mnemonic device that helps you remember how to label a graph, but it is not directly related to the dependent variable in this case.

The student should use a comparative investigation to see how fast the different balls roll down a ramp. In a comparative investigation, different objects or events are compared to determine differences or similarities. In this case, the student wants to compare the speed of four different balls, so a comparative investigation is the most appropriate approach.

The independent variable in this scenario is "every day." The independent variable is the factor that is manipulated or changed by the researcher in an experiment. In this case, the researcher is measuring plant growth every day, indicating that they are changing the variable of time to observe its effect on plant growth. Therefore, "every day" is the independent variable in this context.