Question

Q - 2

A student conducts an investigation to determine which magnet is strongest: the horseshoe, the bar, or the ring. The student tests each magnet one time using the same metal object and announces that the bar magnet is strongest.


What is wrong with the student’s reasoning?





A. It is not necessary to test the strength of the magnets because they all have the same strength of force.


B. A bar, a ring, and a horseshoe magnet are unable to be tested against each other because they are too different.


C. A scientist must always report the results of their investigations in a graph, instead of announcing the results.


D. A scientist is unable to be certain of results without repeated investigations to test the reliability of the results.


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Q - 2










Item 5

Think about what is known about gravity.


What would happen to a brick thrown into the air if gravity were nonexistent?



A. The brick would float away without the force of gravity to bring it back down.


B. The brick would fall back faster than usual without the force of gravity.


C. The brick would fall back, but much slower without the force of gravity.


D. The brick would be too heavy to throw into the air without the force of gravity.

Answer 1

The student’s reasoning in the investigation is flawed because the student only tested each magnet one time, which is not sufficient to conclude that the bar magnet is the strongest. To accurately determine which magnet is the strongest, the student should have tested each magnet multiple times and taken an average of the results to ensure the reliability of the data. Therefore, option D is the correct answer.

As for Item 5, if gravity were nonexistent, the brick would float away without the force of gravity to bring it back down. Therefore, option A is the correct answer.