# A Mistake 99% Badminton Stores Are Making

Discussion in 'Market Place' started by magiadam, Apr 12, 2008.

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Whenever they describe the weight of the racket, it is described with a unit of 'Grams' or 'Lbs', when it should be expressed with a unit of 'Newtons' since they're talking about the weight technically. They should express the racket's mass properly.

Just a thought XD

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2. ### Tsumaranai Regular Member

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Um.., mass is not the same as weight. Weight is relative to gravity, and will be what you feel. Mass is the measurement of the amount of matter. Also, mass is expressed in grams...

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But my point is, if they express in Weight, they must use a unit of force, such as Newtons.

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4. ### Tsumaranai Regular Member

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But they're not... They're measuring the mass.

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Then it should be:

"Mass: XXX Kg"

"Weight: XXX Kg"

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6. ### jerby Regular Member

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weight is a force, and indeed has the unit of newtons.
Mass however is an (extensive?) property, and has a unit of grams or pounds.

Also, just for poops and giggles... weight is not only dependend of the gravity, it is depended on all the forces acting on the object.
a 5kg table is acting on the floor with a weight of roughly 50N, whent he table is left standing. but when I lean on it with a 100N force the table is acting on the floor with a weight of 150N.

But it's such a common misconception everybody knows what is meant...
Our site happily states weight

(I guess this removes any doubt people had I was a geek, now they know for sure )

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7. ### Fidget Regular Member

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Force is mass times acceleration. (kg*m/s2)

If you consider that the earth is pulling the racquet's mass at all times downward, I guess you could certainly describe it in Newtons....and that would be handy... when?

You: "Hey doc, my buddy dropped his 0.090kg racket on my head at 9.8m/s2 meaning I sustained a 0.882 Newton force to my forehead."
ER doc [busy stitching] "Mm, thanks for that Sport. Now just sit still, that's a good lad."

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8. ### Tsumaranai Regular Member

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Now there's the argument you were going for.

Well, we're talking about "empty" weight, without other forces acting on the object besides gravity. Of course, that's not technically weight. Weight is one property, while another force is not considered the weight, as it is the addition of the weight of another object while there is also work being done on the object if you were to lean on it.

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Last edited: Apr 12, 2008
9. ### Fidget Regular Member

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That's as clear as mud
Simply put, the weight is the force the Earth has on an object's mass.

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10. ### cooler Regular Member

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u must be a newton fan

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11. ### Fidget Regular Member

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Me too. I loved her in 'Grease'!

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12. ### cooler Regular Member

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oh? i thot she's a neutron bomb

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13. ### jerby Regular Member

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weight is the force than one body acts on another (a rock lying on a table outs weight on the table)
the force the earth has on an object is called gravity

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14. ### Pete LSD Regular Member

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Long lived Newtonian mechanics !!!

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15. ### Fidget Regular Member

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Thanks Jerby. I stand corrected.
Who would have thunk that BC could be so educational?

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16. ### Tsumaranai Regular Member

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Ok, well, to clarify: The "weight" weight of an object is generally considered to be just the object and the force of gravity upon the object. If you were to lean on a table, you are not merely placing your weight and adding to the force the table is exerting on the ground. You would be imparting energy and thus doing work. You would first have to calculate work before you add that additional force. If you placed a book upon a table, I would not call that the weight of the table. I would say that there's the weight of the table and the weight of the book, or else the weight of the table in addition to the force exerted by the book upon the table. I wouldn't combine individual weights to be considered as a number that represents both objects, such as was done with the table and the leaning.

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17. ### cooler Regular Member

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i believe in a newtonian world, both reference objects of mass are attracting to each other. ie, the racket mass is pulling onto earth's mass too.

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18. ### Pete LSD Regular Member

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There is certainly potential energy with the person placing his weight on the table. If the person's feet slipped and fell (PK his/her face on the table), the drop in height is the change in potential energy translated into kinetic energy. Ouuuccchhhh, what a painful way to experiment with Newtonian mechanics .

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19. ### Pete LSD Regular Member

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Yes and the Earth's mass is just overwhelmingly huge .

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20. ### cooler Regular Member

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that is why it is better and simplier to express the racket in gram, not in newton.

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