Identifying forces (normal force, weight, gravity)

[KingAlexander211B]

When an object is resting on a surface such as the floor, there are exerted on it two forces: The normal force - force of the ground - and the weight (the force of gravity, the Earth pushing the object down), the forces drawn on the left.

What are the forces on the right? Are they the same as the ones on the left or are they something else?

Isn't the repulsion by the ground the same as the force of the ground?

 

[Orodruin]

You are mixing up two concepts, the free body diagram and the force pairs from Newton’s third law.

The free body diagram has to do with what forces act on a body of your choice. If you draw a FBD you should only draw the forces that act on the object. If you here take the ”object”, the forces in the FBD would be gravity and the normal force. If the object is at rest they are going to be equal and opposite - but they are not a Newton 3 pair.

The N3 pair of the normal force is the contact repulsion force from the object on the ground and the N3 pair of the gravitational force on the object is the gravitational force that the object excerts on the Earth.

 

[A.T.]

View attachment 239644
Isn't the repulsion by the ground the same as the force of the ground?

Yes. Not a very good diagram. Redundant and not clear on which object the forces act.