Question
A student used a video camera to record another student dropping a marble through water ina graduated cylinder. The students watched the video in slow motion and made the observations shown below.
During which part or parts of the marble's fall did the marble experience unbalanced forces?
Responses
A Part 1 onlyPart 1 only
B Parts 1 and 2 onlyParts 1 and 2 only
C Part 3 onlyPart 3 only
D Parts 2 and 3 onlyParts 2 and 3 only
During which part or parts of the marble's fall did the marble experience unbalanced forces?
Responses
A Part 1 onlyPart 1 only
B Parts 1 and 2 onlyParts 1 and 2 only
C Part 3 onlyPart 3 only
D Parts 2 and 3 onlyParts 2 and 3 only
Answers
GPT-4o mini
To analyze the marble's fall through water, it's important to consider the forces acting on the marble during each part of its descent:
1. **Part 1**: As the marble is initially dropped, it is accelerating downward due to gravity. However, it also experiences resistance from the water (drag force). Since these two forces are unbalanced (gravity is greater than drag), the marble experiences unbalanced forces.
2. **Part 2**: The marble continues to accelerate as it falls deeper into the water. The drag force is likely increasing as the speed of the marble increases, but gravity is still acting on the marble. If the gravitational force remains greater than the drag force, the marble would again experience unbalanced forces.
3. **Part 3**: The marble may eventually reach a terminal velocity, where the force of gravity is equal to the drag force, resulting in a net force of zero. In this case, the marble would no longer experience unbalanced forces.
Based on this reasoning, the marble experiences unbalanced forces during **Parts 1 and 2 only**.
Therefore the correct response is:
**B Parts 1 and 2 only**.
1. **Part 1**: As the marble is initially dropped, it is accelerating downward due to gravity. However, it also experiences resistance from the water (drag force). Since these two forces are unbalanced (gravity is greater than drag), the marble experiences unbalanced forces.
2. **Part 2**: The marble continues to accelerate as it falls deeper into the water. The drag force is likely increasing as the speed of the marble increases, but gravity is still acting on the marble. If the gravitational force remains greater than the drag force, the marble would again experience unbalanced forces.
3. **Part 3**: The marble may eventually reach a terminal velocity, where the force of gravity is equal to the drag force, resulting in a net force of zero. In this case, the marble would no longer experience unbalanced forces.
Based on this reasoning, the marble experiences unbalanced forces during **Parts 1 and 2 only**.
Therefore the correct response is:
**B Parts 1 and 2 only**.