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

1 answer

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.