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The forces acting on the cardboard are the Normal Force and the Gravity force of the same magnitude but in opposite directions
The pair of forces acting on the cardboard are forces in Balanced
In Newton's first law, it is stated that if the resultant force acts on an object is zero, it can be formulated:
[tex]\large {\boxed {\bold {\sum F = 0}}[/tex]
then the object tends to defend itself from its state.
or can be stated:
An object at rest stays at rest and an object in motion stays in motion unless acted upon by an unbalanced force.
So for objects in a state of movement, objects tend to move forever. Likewise, for objects in a state of rest, they tend to remain forever. The tendency of objects like this is called inertia
The size of inertia is proportional to mass, the greater the mass of the object, the greater the inertia of the object.
In objects with mass that move translatively, the object will maintain its linear velocity
Forces are balanced when all the forces act upon an object balance with each other
Forces are unbalanced when there is an individual force that is not being balanced by another force
The cardboard is at rest, meaning the resultant force = 0 (∑F = 0 means the forces acting on the cardboard = 0)
Force are categorized as vectors because they have magnitude and direction.
The forces acting on the cardboard at rest :
The force caused by the earth's gravitational force on matter
Formula:
[tex]\boxed{\bold{W=m\times g}}[/tex]
w = gravity (N)
m = mass of object (kg)
g = acceleration due to gravity (m / s²)
= 9.8 m / s² or 10 m / s²
The force acting on two surfaces of objects in contact and the direction perpendicular to the surfaces
So at rest, there are two forces that are equal but opposite in direction, Normal force and Gravity force
Can be formulated:
[tex]\rm \sum F = 0\\\\N-W=0\\\\\boxed{\bold{N=W}}[/tex]
Actually there is also a frictional force that is the force in the opposite direction to the direction of motion of the object. An object at rest is called a static friction force, but this is done when an object is pulled by force
Frictional force formula
inertia
https://brainly.com/question/1149654
example of 2nd newtons law
https://brainly.ph/question/2097158
the first newton's law
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an object remains at rest
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