Weight and gravitational force?

[chemistry1]

Hi, I'm wondering if anybody could explain me the difference between these two concepts with a clear definition for someone who JUST began physics. Thanks ! Particularly, concerning this equation w=Fg=mg

Also, just to be sure I'm doing it in the right way, could I say that would be good

Ex : 15N=Fg=m*9,80N/Kg

re arrange like Fg=15N=m*9,80N/Kg

Would this be acceptable to solve for mass, knowing that these equations are equivalent ?

 

[mathman]

Just make sure you have the right unit for mass. It looks like kg. in your description.
Weight is usually defined as the gravitational force on the surface of the earth.

 

[chemistry1]

Just make sure you have the right unit for mass. It looks like kg. in your description.
Weight is usually defined as the gravitational force on the surface of the earth.

Well, it's kg, isn't that the right unit ? And for weight and Fg of an object, it's exactly the same thing ?

If I have X N of weight, it means the gravitational force which gives that weight to the object will have the same numerical value ?

is this a good way of viewing it ? thanks

 

[Doc Al]

Well, it's kg, isn't that the right unit ?

Yes, kg is the standard SI unit for mass.

And for weight and Fg of an object, it's exactly the same thing ?

No. Weight is a force; the standard SI unit for force is the Newton.

If I have X N of weight, it means the gravitational force which gives that weight to the object will have the same numerical value ?

is this a good way of viewing it ? thanks

No. Near the Earth's surface, a 1 kg mass will have a weight of W = mg ≈ (1 kg)*(9.8 N/kg) = 9.8 N.

 

[chemistry1]

Yes, kg is the standard SI unit for mass.


No. Weight is a force; the standard SI unit for force is the Newton.


No. Near the Earth's surface, a 1 kg mass will have a weight of W = mg ≈ (1 kg)*(9.8 N/kg) = 9.8 N.

Sorry if I misleaded you, I didn't mean that weight and Fg was in Kg. xD

It's just I don't see the relationship between weight and Gravitational force of an object.

Does w=mg and Fg=mg mean the same exact thing ? Could you tell it to me ? thanks again

 

[Doc Al]

It's just I don't see the relationship between weight and Gravitational force of an object.

They are the same thing: the weight of an object is the gravitational force exerted on it by the earth.

Does w=mg and Fg=mg mean the same exact thing ?

Yes.

 

[chemistry1]

They are the same thing: the weight of an object is the gravitational force exerted on it by the earth.


Yes.

Ahhhhhhhhhhhhhhhhhh... Finally, that's what I wanted to read and be confirmed. Now, that makes me happy ! Thanks you and everyone else who posted !