Inertia.
When the index card is quickly pulled away from the glass in a horizontal direction, the disk tends to remain at rest due to its inertia. Inertia is the property of an object to resist a change in its state of motion. So, even though the card is removed, the disk maintains its vertical position due to its inertia and falls straight down into the glass.
Why does the disk fall straight down into the glass when the index card is quickly pulled away from the glass in a horizontal direction? (1 point) Responses Static friction Static friction Inertia Inertia Equilibrium Equilibrium Kinetic friction
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