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
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.
When the index card is quickly pulled away from the glass in a horizontal direction, the disk falls straight down into the glass due to inertia.
Inertia is the tendency of an object to resist changes in its state of motion. In this case, when the index card is pulled away, the disk initially remains stationary due to static friction between the card and the disk. However, when the card is moved suddenly, the static friction is overcome. As a result, the disk no longer experiences any external force in the horizontal direction.
Since there are no forces acting horizontally on the disk, it continues to move in the same direction with the same horizontal velocity it had before. Meanwhile, gravity becomes the only force acting vertically on the disk, causing it to fall straight down into the glass.
To conclude, the disk falls straight down into the glass because of inertia, which keeps it moving horizontally despite the removal of the card.