# Questions tagged [weight]

Weight is the force on the object due to gravity. DO NOT USE weight as a colloquial substitute for mass.

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### What impact does air have on our weight?

Although air is light, it is fluid. So it must exert upthrust on people. So does it mean, in fact, we are heavier than our weight? Also, the gravitational acceleration is bigger than its value?
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### Does general relativity predict different forces on aircraft than Newtonian mechanics?

When taught how airplanes fly, we are probably always given the Newtonian mechanism: that four forces act on an airplane; lift and weight on the vertical axis, and thrust and drag on the horizontal ...
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### Is the non-technical definition of weight same as mass or is it also affected by gravity?

Technically, weight is the force which an object applies in downward direction, with Newton as its SI unit. However in non-technical usage, weight is a measure of heaviness or lightness of an object, ...
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### Simple dynamics im really confused

So my question is a little dumb: if an object on a scale has a weight that points downwards and the scale exerts normal force on the object upwards, cancelling the forces acted on the object then what ...
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### If 1 gram force on Earth is 0.0098 N, what would it be on Mars or others?

I know that this is a very simple question, but I am not really sure about this. If 1 gram force on Earth is $0.001 \;\text{kg} \times 9.8 \;\text{m}\,\text{s}^{-2}$, what would it be on Mars or any ...
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### Why $\rm kg$ in daily life but not $\rm kg~m/s^2$? [duplicate]

I had a question regarding weight so here I begin W=mg (where w=weight,m=mass,g=gravitational acceleration) w= kg*m/s^2(kg is the si unit for mass and weight , m/s^2 is the si unit of gravitation) w= ...
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### Why do physics textbooks mention weight when saying mass? [duplicate]

I've always found in physics textbooks (and in general too) that when a paragraph or question mentions mass it actually is succeeded by weight of the object in question. For example, The mass of the ...
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### Why is weight in a fluid not equal to the buoyant force?

We know that, weight is the normal force acting on us. And for this 'normal force' to exist 'something' has to be under us. My question is when we're in water on any other fluid, is that fluid that '...
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### Why is the weight of object is not included as a force pushing an object down in fluid?

In fluid mechanism, I have one doubt always, When calculating the force upon object They said force pushing object down is $F=PA$ ($P$=atmosphere pressure, $A$=surafce area of object) But why don't we ...
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### Do things weigh the same in different orientations?

What experiments have been done to check that objects weigh the same in different orientations? To what accuracy has it been checked that the two weights of the same object in the positions below (for ...
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### How is light affecting the weight of different colored objects?

I was told here that light can move an object and that it pushed against it. Lets say I have objects of the colors Red, Green, Blue, Yellow, Magenta and Cyan, each placed on different balances that ...
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### Weight dependency on the location on Earth relative to Sun

In this post a theoretical physicist says that one will weigh less at the point on the Earth closest to the Sun due to the Sun's gravity, which makes sense to me. But he also says that one will weigh ...
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### How would a weightless object behave on earth?

DISCLAIMER: Bear in mind that I am a mere 11th-grader: It came to me that an object with a net zero pounds (on earth) might sit more-or-less statically in the air. An example might be a ball of ...
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### Max angle to avoid cart crash [closed]

How can I calculate max angle to avoid my cart to roll out or crash ? I need to move a weight of 3 kg at a height of 2 m, with a cart that weights 20 kg. Here attached an image: I would like to find ...
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### Discuss the possibility of using force rather than mass as the basic quantity. (Kibble, Classical Mechanics)

I'm starting first year in the Autumn and I'm doing some pre-university maths and physics. One of the questions I had a go at doing was this one, from Classical Mechanics by Kibble: Discuss the ...
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### If you laid a perfectly level beam on a centered scale and an off-center scale, what weight would each scale measure?

Imagine you laid a metal beam on a scale so that the scale was in the center of the beam, so it would be balanced and not fall off. The scale would display the full weight of the beam. But what if you ...
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### Astronauts being able to move "heavier" objects easily in space

I was watching this video where the astronauts demonstrate how an object that would weigh some large amount on Earth is nearly weightless in the microgravity experienced onboard the ISS. What I don't ...
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### The Koi Pond Observation Tower Conundrum [closed]

I am building a koi pond. I want to install an observation tower. The observation tower is made of glass, either cuboid,cylindrical or hexagonal. The bottom of the tower sits on a frame which is just ...
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### Calculating the change in position of center of mass when additional weight is added to a non uniform object

Hi guys I have a good fundamental on basic calculations for position of center of mass, however I am having troubles creating my modelling for my problem as stated above. To make the model easier, let'...
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### Why does the reading of load cell changes with change in the mounting styles?

I'm working on a project in which I have connected the loadcell to Arduino via the HX711 ADC. I mounted the load cell in two different configurations as shown in the image. With the connections, ...
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### Making a structure attached to a pole taller - will it introduce more force on the pole?

I was really trying to find a suitable title for this post, and I understand it might not be suitable for this StackExchange. However, some physics involving bending and forces do come in play, so I'...
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### Why is weight comparison transitive?

Suppose I have a regular pair of weight-comparison scales sitting on my kitchen table, and three weights. When I place A on either side and B on the other, the "B" side always goes down. ...
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### Does a floating ship increase the pressure on a scuba diver?

In the article Ship Traffic Increases Dramatically, to Oceans' Detriment , there is a quote (emphasis mine) : "I was surprised to see that in 20 years, the growth is almost fourfold, or almost ...
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### Force of gravity at a level of fixed escape velocity [duplicate]

A brick (1 Kg) is placed on a surface that is stationary, relatively to a non-spinning black hole. The escape velocity at this level is 1/2 of the speed of light. Can we compute the weight of the ...
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### Difference between Kilogram-weight and mass

I got really confused about this $\text{kg-wt}$ and mass when I went through a question which says A body weighs $700\text{ kg-wt}$ on Earth surface. How much will it weigh on the surface of a planet ...
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### What is Newton's original definition of mass?

What is Newton's original definition of mass. The following is from the English translation of Newton's Principia by Andrew Motte. "The quantity of matter is the measure of the same, arising ...
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### What does it mean that the relationship between material mass and weight is constant and proportional?

I hope someone can help me with this apparently very basic doubt, but I feel like a stupid monkey trying to join two sticks to reach bananas and without success. My English is not good, I am Mexican ...
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### Got confused about weight loss in liquid [closed]

Suppose two objects of the same mass but of different densities are dropped on water. The large object (say polypropylene) has a lower density than water and the small one (say stainless steel) has a ...
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### Understanding what a scale outputs and converting between Mass and Weight

I understand that weight is a measure of force acting on an object due to gravity and mass is a measurement of the quantity of matter than an object contains. With mass having units of kilograms or ...
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### Weight in Newtonian mechanics

What do we mean by the term weight? Is it an upward force exerted by an object to counteract the downward force of gravity (or) is it the downward force itself? Is the magnitude of the weight always ...
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### Measuring Weight with Multiple Scales

If I am weighting a long tube of (nearly) uniform weight with multiple hang-scales (really a 10-ft long Helical Antenna), how do I calculate the total weight from the multiple scales? Can I just add ...
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### Measuring the correct mass or weight of an object in the presence of atmospheric pressure?

I know due to atmospheric pressure the weight of an object increases, but when we take measurements we do not omit the weight of the column of air above it. So, doesn't it affect the accuracy of our ...
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### Pressure inside when a container is closed

Let us suppose that there is a container with its lid open sitting at the bottom of an ocean. The pressure at the bottom of the container will depend on the water column above it assuming only static ...
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### What is the weight of body on inclined plane? [closed]

If weighing machine is kept on inclined plane,and a person measures his weight on the scale,will he get less or more weight on scale Acc to me mg cos theta will be shown in the weighing scale, so if ...
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### How can we find the total weight of a pulley apparatus? [closed]

I recently have been trying to solve this problem, which asks me to find T3 assuming that g = 9.8: My idea was to find the ...
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### Weight exerted by two blocks of metal [closed]

Can 2 blocks, composed of different metals, have the same masses but different volumes and still have the same weight if hung on a spring balance?
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### Bath-Scales weight or mass?

I read that bath scales measure body weight and not mass which means they measure m*g and not m. If I got a reading of 50 kg, does that mean that my mass is nearly 5? Units of m*g aren't kg so why ...
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### In Newtonian mechanics, does the motion of an object change its weight (as opposed to mass)?

A wedge of mass $M$ is kept on a spring balance. A small block of mass $m$ can move along the frictionless incline of the wedge. What is the reading of the balance while the block slides? Ignore the ...
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### Air bubble's weight measurement

https://en.wikipedia.org/wiki/Bubble_(physics) https://en.wikipedia.org/wiki/Soap_bubble https://www.instagram.com/p/CE4FSctpCdu/?utm_source=ig_web_button_share_sheet Is it possible to create air ...
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### Does weight have any function in vacuum? [closed]

As we know, that in a vacuum, bodies with different masses fall with same acceleration, which is due to acceleration due to gravity. But Weight of a body is dependent on mass as well. So, is it so, ...
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### Does increasing the circumfrence of a wall around a pond increase the pressure against the wall?

I have a wall that forms a circle around a pond. It is 3 bricks high and 10 ft in diameter. It is made of bricks that weight 20 pounds. ...
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### What theories solve the problem of weight dispersion to minimize damage?

I don't have a physics background; I assume there's some simple link to give me to answer this, but I don't know the terminology for it and so haven't been able to solve this. The use case it to avoid ...
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### How is weight $W = 0$?

One of my physics teachers told me that in the formula of calculating weight i.e. $W = mg$, $m$ is not equal to 0 until and unless you're travelling close to the speed of light. She added, that the ...
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### Does adding weight to a person affect the time taken for a person to run 20 metres?

I am doing a science experiment to see if adding weight to a person affects the time taken for a person to run 20 metres. I am needing to write some background information (1 page) and I am not too ...
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### What happens to weight when ice melts? [closed]

A block of ice is weighed in a container. Then, it is left out to melt. Would the weight of the water be greater, less than, or equal to the ice? I know that it has something to do with density and ...
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### If an elevator and its shaft were weighted, would they weight less as the elevator goes up?

I have a question that would probably be easy for you. If we could put an elevator together with its shaft on a scale and have its motor pull it up, lets say for 50 floors. will the reading on the ...
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### Normal component of force exerted

Suppose a simple setup where a free load (red) is supported by an inclined plane (pink) and a block at the end of the inclined plane (blue) touching the load as shown: Is the force normal to the pink ...
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### Apparent weight due to buoyancy

I was asked whether weight of a submerged object changes. The following is my current understanding of the matter and will likely contain errors. Please correct me, if I made any mistakes. Imagine an ...