Question

in the context of newtons third law, what is the reaction force? *
3 points
○ the initial push or pull that one object applies to another.
○ the force that resists the motion of an object.
○ the combined force of two objects acting in the same direction.
○ the force that the second object applies back to the first object.

what is the formula for newtons second law of motion? *
2 points
○ f = m + a
○ f = a / m
○ f = m / a
○ f = m * a

what is the net force? *
2 points
5 n ← □ → 5 n

Explanation:

First Question (Reaction Force in Newton's Third Law)

Newton's Third Law states that for every action, there is an equal and opposite reaction. The action is the force one object applies to another, and the reaction is the force the second object applies back to the first. The first option is the action force, the second is friction (not reaction force), the third is not related to Newton's Third Law. So the correct option is the one about the second object applying force back.

Newton's Second Law of Motion states that the force (\(F\)) acting on an object is equal to the mass (\(m\)) of the object multiplied by its acceleration (\(a\)), so the formula is \(F = m\times a\) (or \(F=ma\)). The other options have incorrect operations (addition, wrong division).

Step1: Identify the forces' directions and magnitudes.

There are two forces: \(5\,\text{N}\) to the left and \(5\,\text{N}\) to the right.

Step2: Calculate the net force.

Forces in opposite directions subtract. So net force \(F_{\text{net}}= 5\,\text{N}- 5\,\text{N}=0\,\text{N}\).

Answer:

D. The force that the second object applies back to the first object.

Second Question (Formula for Newton's Second Law)