Question

Emily and Sarah are designing an experiment to test how far 1-kg, 2-kg, and 4-kg metal washers can be pulled using the same force. What must remain constant in the girls' experiment?

A) The amount of force applied.
B) The mass of the washers.
C) The size of the project board.
D) The time it takes to pull each washer.

Answer 1

The amount of force applied must remain constant in Emily and Sarah's experiment to test how far metal washers of different masses can be pulled.

Step-by-step explanation:

Emily and Sarah are designing an experiment to test how far different mass metal washers can be pulled using the same force. In order for their experiment to be valid, the amount of force applied must remain constant. This is because they are trying to isolate the variable of mass to see its effect on the distance moved. Other factors such as the mass of the washers, the size of the project board, and the time it takes to pull each washer will differ naturally as they are part of the experimental design to test the effect of mass on the distance moved when the same force is applied.