An object is at rest on the ground. The object experiences a downward gravitational force from Earth. Which of the following pre

Question

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An object is at rest on the ground. The object experiences a downward gravitational force from Earth. Which of the following pre

dictions is correct about why the object does not accelerate downward? Select two answers. Justify your selections.A) The bonded molecules of the object are repelled upward by the bonded molecules of the ground with the same magnitude as the gravitational force downward on the object.B)The normal force is exerted upward on the object from the ground with the same magnitude as the gravitational force downward on the objectC) The bonded molecules of the object are attracted downward by the bonded molecules of the ground with the same magnitude as the gravitational force downward on the object.D) The force of friction is exerted upward on the object from the ground with the same magnitude as the gravitational force downward on the object.

Physics

2 answers:

Yuliya22 [3.3K] · Answer 1 · 2026-03-03T13:18:15+03:00

Answer:

A) and B) are valid.

Explanation:

When an object remains at rest, it is indicative that no net force acts upon it.

The downward gravitational force from Earth must be counterbalanced by an upward force of equal magnitude in order to maintain rest.

This upward force is provided by the normal force, which adjusts to satisfy Newton’s 2nd Law and is always perpendicular to the surface supporting the object (in this instance, the ground).

At the molecular level, this normal force comes from the ground's bonded molecules acting like tiny springs, compressed by the object’s molecules, providing an upward restorative force.

Thus, statements A) and B) are true.

serg [3.5K] · Answer 2 · 2026-03-03T13:18:01+03:00

Answer:

The bonded molecules in the object are pushed upwards by the bonded molecules in the ground, matching the gravitational force pulling down on the object.

The ground exerts a normal force upwards on the object, equal to the gravitational force acting downwards on it.

Explanation: