Question

1. max hypothesized that changing the height of an inclined plane would change the speed of a marble rolling down that plane. he tested his hypothesis by rolling the same marble down the plane three times each at three different heights. santos used the same procedures to test the same hypothesis. santos using the same procedures is an example of which of the following?

a. replication
b. repeated trials
c. drawing a conclusion
d. testing a new hypothesis

1. joshua was testing the effect of mass on force and acceleration. he built a rubber band launcher and used it to control the amount of force used to accelerate a car with three different masses, as shown below.

which of the following should he do to make sure his data is valid?
a. use the same car and test each mass three times
b. use the same car and test each mass one time
c. use a different car and test each mass one time
d. use a different car and test each mass three times

1. khajit is reading a story about james lind’s experiments with vitamin c in sailors. the story explains that lind divided sailors into pairs, and gave each pair a different treatment for scurvy. what is the most likely reason that lind divided sailors into pairs?

a. lind was conducting multiple trials for each treatment.
b. lind didn’t want sailors to be alone during the experiment.
c. lind was conducting two different experiments at the same time.
d. lind planned to use only the best result from each pair in his report.

Explanation:

1. Replication in science is when another researcher repeats the same experiment. Max tested a hypothesis and Santos used the same procedures, which is replication.
2. To ensure valid data in an experiment testing the effect of mass on force and acceleration, one should keep the car (a variable that should be controlled) the same and do multiple trials for each mass to account for random errors.
3. Dividing sailors into pairs was likely for conducting multiple trials for each treatment to get more reliable results.

Answer:

1. A. replication
2. A. use the same car and test each mass three times
3. A. Lind was conducting multiple trials for each treatment.