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weight
In science and engineering, the weight of an object is the force acting on the object due to gravity.Some standard textbooks define weight as a vector quantity, the gravitational force acting on the object. Others define weight as a scalar quantity, the magnitude of the gravitational force. Yet others define it as the magnitude of the reaction force exerted on a body by mechanisms that counteract the effects of gravity: the weight is the quantity that is measured by, for example, a spring scale. Thus, in a state of free fall, the weight would be zero. In this sense of weight, terrestrial objects can be weightless: ignoring air resistance, the famous apple falling from the tree, on its way to meet the ground near Isaac Newton, would be weightless.
The unit of measurement for weight is that of force, which in the International System of Units (SI) is the newton. For example, an object with a mass of one kilogram has a weight of about 9.8 newtons on the surface of the Earth, and about one-sixth as much on the Moon. Although weight and mass are scientifically distinct quantities, the terms are often confused with each other in everyday use (i.e. comparing and converting force weight in pounds to mass in kilograms and vice versa).Further complications in elucidating the various concepts of weight have to do with the theory of relativity according to which gravity is modeled as a consequence of the curvature of spacetime. In the teaching community, a considerable debate has existed for over half a century on how to define weight for their students. The current situation is that a multiple set of concepts co-exist and find use in their various contexts.
Hi, can someone tell me how we worked out the weight of lead per foot by using a piece of string and wrapping it around it? I cannot see it on the search bar any where.
Cheers
Hi Everyone,
Just wondered if anyone can recommend good site/book for working out load bearing of joists (also good book for general construction/building). i am quoting a job and 300litre cylinder would be preferred but worried about weight as on 1st floor in airing cupboard.
luckily they...
Hi,
Apologies for such an exciting post but looking for recommendations for new shelves to go in my garage. Having a a sort out on Saturday and need to free up some floor space.
Needs to hold plumbing stuff, the usual bits vehicle battery chargers, motorbike stuff and a small piece of wood...
Nmf 3 last post the radiator views 329 replies 19. 5.79%
Fixings
Ok you've struggled the double panel extended surface radiator into the room ,it's already heavy and when it's full of water it'll be heavier still. As my old. Physics master use to drum in to me "a pint of water weighs a pound...
I'm no weakling by all means, but I'm no he-man either. I've started training to build up my strength again (used to train quite a lot a few years ago) to make my life easier when I start fitting boilers for my firm when I get gas safe.
I was reading through some boiler manuals (this is for a...
Sick of carrying a ton of tools so looking to lighten up my tool bag starting with swapping my stilsons! been looking at the lenox ones, any suggestions on some good (light) stilsons? Whats everyone else rolling with?
The bottom section of our 5 x 4.5`x 4" stack has split and must be replaced imho! It has been suggested that it is a simple job to remove the split section and replace it with pvc...I wonder about the weight of the upper sections - is it realistic to have a CI stack sitting on a pvc bottom...
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Don't need to lose any but decided after pigging out over xmas to try and eat a bit more healthy so cut out biscuits and cake and almost most choccy......have the odd bit of wholenut my weakness in all of this have lost 6 lb without trying really still eat my takeaways but eating more fruit and...
Missus finally had an colonoscopy today and they couldnt find anything other than internal piles. This is good to me as missus may have an ulcer which isnt good but has to be better than possible things it could have been racing through our heads for last 8 weeks. Anyway further investigations...
Hey guys,
Recently managed to get shot of an awful bath I purchased stupidly from one of the DIY chains... now looking at some Carron ones.
There's so many baths with a curved end at the taps these days and the one thing that's bugging me crazy is how do people out there fit the overflow...
Hi,
I have recently had a new bath suite fitted since which time the bath has been leaking and the plumber that fitted it has said there is nothing more he can do :(
the bath is leaking from the plug hole. It leaks when the plug is in and when the bath is being drained or the shower is being...
I plan on moving my hot water cylinder And boiler up into my loft soon just to create a bit more room and to basically get it all out of the way.
my only Concern is I have this type of joist in the loft and was wondering if anyone knows if they are capable of taking the weight of a 125 litre...
Trying to make a homemade adjustable kettle bell (Hungarian core blaster)
Need some advice where to buy the parts which are
3/4 tee
(handles) 2 lengths threaded 3/4 pipe approx 6 inch/150mm long
(down shaft) 3/4 inch pipe threaded both ends about 12 inch long or two bits 6 inch with 3/4...
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Hi to all, I'm new on here so be gentle:wings:
I wish to put a 100 gallon coffin tank in the loft to replace the tank which is not big enough.
Should I be worrying about the total filled weight of it? Any structural engineers here who can reassure me? ( I can measure the joist thickness &...
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