Connection: The g-force/gravity force put pressure on the knots in the same way they put pressure on the body and spine.

Question

[ Question] Which pieces of evidence support the connection? Select the two correct answers.
a.) “This acceleration creates inertia, which is the tendency for an object to keep moving once it is in motion.”
b.) “Your foot is experiencing these really high g-forces as you’re running all the time.”
c.) “The videos showed as the shoelaces bounce up and down with each footfall, the main knot begins to deform.”
d.) “To break down the physics of the phenomena, the researchers attached a small device to the free end of the laces that measured acceleration, and then Gregg went for a walk or a jog.”
e.) “We were surprised that the accelerations were so high.”

Answer 1

The two pieces of evidence that support the connection between g-force/gravity force and pressure on the knots (similar to the pressure felt on the body and spine) are:

b.) “Your foot is experiencing these really high g-forces as you’re running all the time.” - This indicates that the body is subjected to high g-forces, which relates to the pressure felt in the body's structures.

c.) “The videos showed as the shoelaces bounce up and down with each footfall, the main knot begins to deform.” - This provides a clear observation of how the forces applied to the shoelaces (and knots) are akin to the physical pressures and strains experienced by the body due to g-forces.

These two statements specifically highlight the direct impact of g-forces on both the body and the knots, forming a connection between the physical phenomena.

Answer 2

I think the correct answers are b and d

Answer 3

Let’s take a closer look at your reasoning regarding answers b and d:

• b.) “Your foot is experiencing these really high g-forces as you’re running all the time.” - This statement does support the concept that g-forces exert pressure on the body, making it a good choice.

• d.) “To break down the physics of the phenomena, the researchers attached a small device to the free end of the laces that measured acceleration, and then Gregg went for a walk or a jog.” - While this mentions measuring acceleration, it does not directly support the connection regarding how these forces impact the knots in shoelaces as analogous to the pressure on the body and spine.

In contrast, c.) “The videos showed as the shoelaces bounce up and down with each footfall, the main knot begins to deform.” demonstrates a direct observation of how the application of forces (due to running) affects the knots, thus supporting the analogy to the pressure on the body and spine.

So, the most fitting pair that links the g-forces and their effect on knots in shoelaces would be b and c, rather than b and d.

If you have any additional context or reasoning, feel free to share it!