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 Inertia Inertia Static friction Static friction Kinetic friction Kinetic friction Equilibrium
The correct answer is: Inertia.
The disk falls straight down into the glass due to the principle of inertia. Inertia is the tendency of an object to resist changes in its motion. When the index card is quickly pulled away from the glass in a horizontal direction, the disk initially remains in place due to the static friction between the disk and the card. However, once the card is removed, there is no longer any force opposing the downward motion of the disk. As a result, the disk falls straight down into the glass, following the path dictated by gravity.
The reason the disk falls straight down into the glass when the index card is quickly pulled away from the glass in a horizontal direction is due to inertia.
Inertia is the property of matter that describes its resistance to changes in velocity. When the index card is pulled away quickly, it imparts a horizontal force on the disk. However, the disk initially remains at rest due to its inertia. As a result, the disk does not immediately move horizontally with the index card.
At the same time, the force of gravity acts vertically downwards on the disk. Gravity is a force that attracts objects towards each other based on their mass. Since the disk has mass, it experiences a downward force due to gravity.
As the index card moves away, the force of gravity causes the disk to start accelerating downwards. This downward acceleration occurs because the gravitational force is unopposed in the vertical direction.
Since there is no force pushing or pulling the disk horizontally, it continues to remain still in the horizontal direction. Therefore, when the index card is quickly pulled away, the disk falls straight down into the glass due to the downward force of gravity and the absence of horizontal forces.