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What is kg wt?

by sphyics
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sphyics
#1
May6-10, 04:37 PM
P: 103
i know its a unit for force... i'm intrigued by the relation 1kgwt=9.8N?

by dimensional analysis

L.H.s [M2L1T-2 {since wt=kgm/s2}
R.H.S [M1L1T-2
i understand i'm wrong somewhere, but i'm not able to figure it out, so pls help me :)

Also how to get the relation between both.( think 9.8 is the contribution of 'g')
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D H
#2
May6-10, 04:44 PM
Mentor
P: 15,167
Quote Quote by sphyics View Post
i know its a unit for force... i'm intrigued by the relation 1kgwt=9.8N?

by dimensional analysis

L.H.s [M2L1T-2 {since wt=kgm/s2}
You interpreted kg wt as mass*weight. A kilogram weight is a unit of force. Specifically, it is the force needed to make a mass of 1 kg accelerate by 9.80665 m/s2.
sphyics
#3
May6-10, 04:52 PM
P: 103
Quote Quote by D H View Post
You interpreted kg wt as mass*weight. A kilogram weight is a unit of force. Specifically, it is the force needed to make a mass of 1 kg accelerate by 9.80665 m/s2.
yes

and how to get the relation 1kgwt=9.8N mathematically.

D H
#4
May6-10, 04:57 PM
Mentor
P: 15,167
What is kg wt?

You can't derive it. The kilogram-force (sometimes called the kilogram-wt) is defined as the force needed to make a one kilogram of mass accelerate by 9.80665 m/s2.
jack action
#5
May6-10, 05:29 PM
P: 565
Quote Quote by sphyics View Post
how to get the relation 1kgwt=9.8N mathematically.
1 kgwt means the "weight of a mass of 1 kg on earth". So:

W = ma = (1 kg)(9.81 m/sē) = 9.81 N = 1 kgwt

kgwt is an arbitrary defined unit for force, just like 1 lb = 4.448 N
sphyics
#6
May8-10, 12:18 PM
P: 103
Quote Quote by jack action View Post
1 kgwt means the "weight of a mass of 1 kg on earth". So:

W = ma = (1 kg)(9.81 m/sē) = 9.81 N = 1 kgwt

kgwt is an arbitrary defined unit for force, just like 1 lb = 4.448 N
Thanks for ur explanation now i understand


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