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Chapter 5: Problem 1

A person standing on a horizontal floor feels two forces: the downward pull of gravity and the upward supporting force from the floor. These two forces (A) have equal magnitudes and form an action/reaction pair (B) have equal magnitudes but do not form an action/reaction pair (C) have unequal magnitudes and form an action/reaction pair (D) have unequal magnitudes and do not form an action/reaction pair

Short Answer

Expert verified
The correct answer is (B). The gravity force and the floor's supporting force have equal magnitudes, but they do not form an action/reaction pair as per Newton's third law of motion.

Step by step solution

01

Understanding the Forces

Firstly, it's crucial to note that there are two forces in action. The force of gravity pulls the person downward and the supporting force from the floor pushes the person upward.
02

Observing the Characteristics of the Forces

The gravitational force drawing the person downward is equal to the floor's support force pushing upward. This because the person is not accelerating and is at rest; this is evidenced by their standing position on the horizontal floor.
03

Applying Newton's third Law of Motion

According to Newton's third law of motion, for every action, there is an equal and opposite reaction. Hence, these two forces are an action-reaction pair. However, it's important to clarify that even though these forces are equal in magnitude and opposite in direction, they do not actually form an action-reaction pair according to Newton's third law. In fact, these forces are acting on the same object (the person), while Newton's third law refers to forces acting on different objects.

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Most popular questions from this chapter

A frictionless inclined plane of length \(20 \mathrm{m}\) has a maximum vertical height of \(5 \mathrm{m}\). If an object of mass \(2 \mathrm{kg}\) is placed on the plane, which of the following best approximates the net force it feels? (A) \(5 \mathrm{N}\) (B) \(10 \mathrm{N}\) (C) \(15 \mathrm{N}\) (D) \(20 \mathrm{N}\)

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