The picture shows a physics lab setup.
Index
Card
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)
Kinetic friction
Equilibrium
Metal Disk
O Inertia
Static friction
Glass
The most likely reason why the disk falls straight down into the glass when the index card is quickly pulled away from the glass in a horizontal direction is inertia. Inertia is the tendency of an object to resist changes in its state of motion. When the index card is pulled away, the disk wants to stay at rest due to the inertia of its motionless state. However, once the contact with the card is broken, the force of gravity acts on the disk, causing it to fall straight down into the glass. This happens because there is no longer any external force to keep the disk in its initial horizontal position. The other options listed, such as kinetic friction, static friction, equilibrium, and the glass itself, do not directly explain why the disk falls straight down.
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 the concept of inertia. Inertia is the tendency of an object to resist a change in its state of motion.
Initially, when the disk is placed on the index card, it experiences static friction with the card. Static friction is the force that exists between two surfaces in contact, preventing relative motion between them.
When the index card is pulled horizontally, the static friction between the card and the disk is overcome. However, the disk tends to maintain its state of rest or motion in a straight line according to Newton's first law of motion.
As a result, the disk continues to move in a straight line downward due to its inertia even after the index card is removed. The absence of any other horizontal force acting on the disk allows it to fall vertically into the glass.
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 the concept of inertia. Inertia is the tendency of an object to resist changes in its velocity.
When the index card is quickly pulled away horizontally, it imparts a horizontal force on the disk. However, the disk is initially at rest and tends to stay at rest due to its inertia. As a result, the disk resists the change in its horizontal velocity.
Now, let's understand why the disk falls straight down into the glass instead of moving horizontally. When the index card is pulled away rapidly, there is a frictional force acting between the disk and the glass. This frictional force is generally stronger than the horizontal force exerted by the index card.
Initially, the disk is in equilibrium, with the downward gravitational force balanced by an equal and opposite normal force exerted by the glass. However, as the index card is pulled, the frictional force acting on the disk increases, since the index card is creating a force imbalance by trying to move the disk horizontally.
Eventually, the frictional force becomes stronger than the normal force, causing the disk to lose its equilibrium and fall into the glass. This happens because the frictional force prevents the disk from sliding horizontally and instead accelerates it downward due to the force imbalance.
In conclusion, the disk falls straight down into the glass when the index card is quickly pulled away horizontally due to the concept of inertia and the stronger frictional force acting on the disk compared to the horizontal force exerted by the index card.