he picture shows a physics lab setup.%0D%0A%0D%0A %0D%0A%0D%0A%0D%0A %0D%0AWhy does the disk fall straight down into the glass when the index card is quickly pulled away from the glass in a horizontal direction?%0D%0A%0D%0A(1 point)%0D%0AResponses%0D%0A%0D%0AKinetic friction%0D%0AKinetic friction%0D%0A%0D%0AInertia%0D%0AInertia%0D%0A%0D%0AEquilibrium%0D%0AEquilibrium%0D%0A%0D%0AStatic friction%0D%0AStatic friction
The correct answer is inertia.
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 tendency of an object to resist any change in its motion. When the card is pulled away quickly, it reduces the friction between the card and the disk. As a result, the disk retains its horizontal motion initially due to its inertia. However, gravity acts on the disk, causing it to accelerate downward. Since there is no longer any horizontal force acting on the disk, it falls straight down into the glass. Therefore, the correct answer is inertia.
To understand why the disk falls straight down into the glass when the index card is quickly pulled away from the glass in a horizontal direction, we need to consider the concepts of inertia and friction.
Inertia is the tendency of an object to resist changes in its motion. When the index card is quickly pulled away from the glass, the disk wants to remain at rest due to its inertia. However, there is also an opposing force acting on the disk, which is friction.
Friction is the force that opposes the relative motion between two surfaces in contact. In this case, as the index card is being pulled horizontally, it creates friction with the disk. The frictional force opposes the motion of the disk and tries to make it move along with the card.
Now, let's consider the options provided:
1. Kinetic friction: This is the friction between two surfaces that are already in motion relative to each other. In this scenario, the disk is initially at rest, so kinetic friction does not apply.
2. Inertia: As explained earlier, inertia is the tendency of an object to resist changes in its motion. When the card is quickly pulled, the disk wants to remain at rest due to its inertia.
3. Equilibrium: Equilibrium refers to a state where the net force on an object is zero, resulting in no acceleration. In this situation, there is no equilibrium as there are forces acting on the disk (friction and inertia).
4. Static friction: This is the friction that exists between two surfaces that are not moving relative to each other. Initially, the disk is at rest, and static friction helps keep it in place when the card is pulled horizontally. However, when the card is pulled quickly enough, the static friction force is overcome, and the disk falls straight down due to its inertia.
Therefore, the correct answer is "Inertia." The disk falls straight down into the glass because it wants to remain at rest due to its inertia, even though there is friction between the index card and the disk.