Definitions
Definitions
Definitions/ Questions
Questions
NJ Practice
100
an investigation in which you have to go through difficult trials and identify all variables?
What is a systematic investigation.
100
an idea that can be tested by a scientific investigation?
What is hypothesis.
100
having the ability to get similar results from multiple trials.
What is reproducible.
100
Juanita considers shortening the wings, adding weight near the nose, and lengthening the tail. She then realizes this is not the best way to figure out how to improve her glider.Why do you think she decided it was not the best way to improve her glider?
What is she should test one independent variable at a time.
100
Gabe designed an experiment to study how temperature affects the rate at which an enzyme digests a protein. He puts equal masses of liver in equal sized test tube, brought the test tubes to different temperatures, introduced equal amounts of enzyme to each tube, and measured the duration of the chemical reaction. What parameters were held constant in the experiment?
What is B, liver mass, test tube size, and enzyme amount
200
the number of observations when gathering data?
What is sample size.
200
a question used to focus the purpose of a scientific investigation and the procedures used to complete it.
What is a research question.
200
a factor that changes in an experiment?
What is a variable.
200
the number of observations made when gathering data.
What is sample size.
200
How does the scientific community confirm that scientists work is valid?
What is other scientists carry out the same experiment to see if they get the same result.
300
factors that should be kept the same from trial to trial.
What is controlled variables.
300
an experiment in which one independent variable is tested by keeping all other dependent variables the same.
What is a fair test.
300
Jack hypothesized that robins prefer large birdhouses to small ones. He built four birdhouses of different sizes to test his hypothesis. What was the independent variable in Jack's stud.
What is A, the size of the birdhouse
300
A Fair test makes a change in one independent variable at a time, to see how the change affects the dependent variable. Why might it be difficult to test just one independent variable at a time?
What is there are many variables that can effect the experiment.
300
Nicole designed an experiment to test the following hypothesis.The mass of a pendulum bob does not affect how long it takes the pudendum to make one complete swing. The steps of the activity are find the masses of four different bobs, construct a table to record data. time the duration of one swing, and tie the four bobs to four strigs of equal length. Which steps should he do in order?
What is D, 2-1-4-3
400
a decision based on investigation and evidence.
What is conclusion.
400
a set of observations in which the independent variable is not changed, to be sure that the dependent variable remains the same also.
What is control group.
400
Paco whether the baseballs used in his league fly farther than baseballs used the year before. He has noticed that many more home runs have been hit this yaer than last year, so he thinks that new baseballs have more bounce. Paco wants to design an experiment to test the idea. State Paco's hypothesis. Then, identify the independent and dependent variable and one variable that must be held constant in the experiment.
What is if a new baseball has more bounce then it will fly farther and lead to more home runs. The independent variable is the new baseball. The dependent variable is the distance it travels and the amount of home runs. A constant in his experiment is the baseball bat.
400
Juanita's study also needs a control group. By comparing the results from the control group with the results from an experimental group, Juanita can figure out how her changes are affecting the glider's flight. What is Juanita's control group?
What is her control group was the first ten test flights.
400
In 1999, a team of researchers claimed that it had made a new element. Two other teams repeated the experiment but could not reproduce the results. The original team took bakc its claim. What do these events say about the process of the scientific inquiry?
What is C, experimental results must be reproducible to be accepted as valid.
500
variable that may or may not change and the variable that always changes.
What is a dependent variable and an independent variable
500
the degree conformity of a measure to a standard of a true value.
What is accuracy.
500
Juantita has built a balsa wood glider with a 1 m wingspan. The glider does not fly as far as she would like, so she needs to make some changes. She could shorten the wings , or add weight along some part of the body, or lengthen the tail. How cpuld she keep track of what changes make the glider fly better and which do not? Juanita takes her glider to the school's gym and makes ten test flights She wants to know the lengths of the shortest and longest flights. Name two things Juanita must do to know the distances of the shortest and longest flights.
What is in order for Juanita to know the distances of her shortest and longest flights, she must measure the distance of each flight and record the distances she measures.
500
Juanita will place the clip 1 cm from the nose, write down where she put it, throw the glider five times, measure each flight distance, and record the results in a data table. She will then place the clip 2 cm from the nose, write down where she put it, throw the glider five times, measure each flight distance, and record the results. Why is it important that Juanita write down the location of the clip and the result each time?
What is she must match the location of the clip to the length of the flight and keep recording to let her know which location of the clip will work best.
500
Lewis wanted to know whether a new brand of shoe could make a basketball player jump higher. He found 18 basketball players who started using the shoes this season and measured how high each player could jump in the new shoes. What error did Lewis make in his investigation?
What is there was no control group for the study.
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