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adrianaeslamian · Dec 6, 2009, 12:43 PM

What is 5 newtons in kilograms? What is 10 newtons in kilograms? What is 15 newtons in kilograms?

Unknown008 · Dec 6, 2009, 10:28 PM

If you are talking about kilograms being the weight, then

5 N = 5 kg

And the same thing applies to the others.

I'm talking about weight because it varies depending on the acceleration fdue to gravity.

Remember: F = ma ?
Weight is similar, W = mg
An object having a mass of 0.5 kg will exert a force of (0.5*10) = 5 N or 5 kg (taking g = 10 m/s^2)

If g were to be different, then the weight will be different, although the mass is the same.

MIMi King · Dec 13, 2009, 05:14 AM

5 N is 0.5 Kg. 10 N = 1 Kg , 15 = 1.5 kg

Capuchin · Dec 17, 2009, 02:12 AM

Originally Posted by Unknown008

If you are talking about kilograms being the weight, then

5 N = 5 kg

And the same thing applies to the others.

I'm talking about weight because it varies depending on the acceleration fdue to gravity.

Remember: F = ma ?
Weight is similar, W = mg
An object having a mass of 0.5 kg will exert a force of (0.5*10) = 5 N or 5 kg (taking g = 10 m/s^2)

If g were to be different, then the weight will be different, although the mass is the same.

kg is always a unit of mass. Newtons are the unit of weight. People sometimes "weigh" themselves in kg, but they are actually calculating their mass - scales have built in conversion from N to kg. 5N is NEVER = 5kg except on a planet where g = 1 m/s/s

lbrltom · Dec 17, 2009, 04:33 AM

A Newton is a measure of force (mass*acceleration) and has units of (kilograms*meters)/(second*second)

On the surface of the Earth (assuming you use acceleration as 10 m/s^2) a 10 kilogram person would be exerting a force of 100 Newtons.

If you were on our Moon, acceleration due to gravity is only 1.6 m/s^2, and a 10 kilogram person would exert a force of 10*1.6, or 16 Newtons.

In deep space, with essentially zero gravitational forces acting on a person, a 10 kg person would be exerting a force of 10*0, or 0 Newtons.

10 kilograms does not change, no matter where you are, but the acceleration you are feeling does. Since Newtons of force depends on your acceleration as well as your mass, the force you experience depends on where you are.

Unknown008 · Dec 17, 2009, 06:49 AM

Originally Posted by Capuchin

kg is always a unit of mass. Newtons are the unit of weight. People sometimes "weigh" themselves in kg, but they are actually calculating their mass - scales have built in conversion from N to kg. 5N is NEVER = 5kg except on a planet where g = 1 m/s/s

Sorry, I don't know what was in my mind when I posted it. I'm feeling somewhat bad now... :(
Sorry.