# 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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### Measuring pressure or weight from an uneven weight distributed surface

I am new here so I hope I'm posting it at the correct place. I am having some troubles with some of my force sensors. My case is like this: I have a body which have a weight. However, the surface is ...
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### Which weighs more in atmosphere, $1\,{\rm kg}$ of steel or $1\,{\rm kg}$ of feathers?

I'm having a discussion at the moment regarding the mass of $1\,{\rm kg}$ of feathers and $1\,{\rm kg}$ of steel. The person I'm arguing with states that $1\,{\rm kg}$ of feathers will be lighter ...
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### Mounting spots for a rectangular shaped object on a wall for optimal weight distribution [closed]

I want to mount a rectangular metal plate (45 cm height, 32 cm width, 0.5 cm thickness) to my wall. For that I plan to glue magnet plates to my wall. A proper weight distribution on the mounting ...
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### Is the notion of 'weight of Earth' meaningless?

I am not talking about the distinction between mass and weight, just the concept of 'weight'. In University physics (book by Young & Freedman, 14th Ed.) it is given that the weight of an object ...
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### Force acting on an object traveling upwards (ignoring air resistance) [closed]

Could someone please help explain to me which formula should be used for a question like this... A ball with the mass of 166.1 g is thrown vertically upwards with an initial velocity of 18.5 m/s. It ...
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### Why consider only $x$ component of accelerating block pulled by cord at an angle?

A $5 \, \text{kg}$ block is pulled along a horizontal frictionless floor by a cord that exerts a force $F=12 \, \text{N}$ at an angle $\theta = 25 \, \text{deg}$ above horizontal. What is acceleration ...
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### Weight and Inertia (are they related?)

R. Feynman wrote in his lecture (The Feynman Lectures on Physics: Chapter-9) "Weight and inertia are proportional, and on the earth’s surface are often taken to be numerically equal, which causes a ...
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### Effect on the weight of a bird in a closed cage with a spring attached to it

I have read the question in which the difference in the weight of a bird in a closed and a open system is described. But what happens if there is a closed cage with wires and also a spring attached ...
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### How to position table legs to distribute weight optimally? [closed]

Background I'm building a table using 4 table legs and a table top. The table top, made out of wood, tends to be quite elastic. Yet, I want the table to be able to hold heavy objects without worrying ...
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### How do we define “mass” in the context of particle physics and relativity?

In laypersons terminology, mass is defined as the amount of matter. However, consider the following: The $W$ and $Z$ bosons have mass. An antiparticle has the same mass as its corresponding particle. ...
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### Temperature relation to Archimedes principle

I have a probably very simple problem which I cant solve. I am weighing animals in seawater by placing them on a small PVC arm that is fixed on a balance and reaches into a beaker of seawater. On the ...
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### What Does a Balance Scale Weigh?

This is, I feel sure, a question I'll eventually be embarrassed about having had to ask, but: Here is a picture of a balance scale. The black rectangle is a vacuum caused by an incredible coincidence ...
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### Does the weight of a steel ball changes when submerged in water? [duplicate]

Will there be a difference in the weight of just the ball under water Vs in normal atmospheric pressure conditions i.e. a weighing scale with the steel ball on it Vs in vacuum assuming earth's gravity ...
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### Does a non-buoyant (denser than water) object (such as a lead diving weight) weigh any less when submerged in water?

I've just been discussing this question with my eldest son, who is an extremely intelligent man, as well as being an engineer, a sailor and a scuba-diver, and he believes that an object heavier than ...
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### Weighing machine, kg vs. N

When I stand on a weighing machine and it shows me the number 75 , is it my mass in Kg or the Normal Force due to gravity in N
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### Why should Vector Components of a Weight be Perpendicular to each other?

So this question came to my head this morning. When analyzing such a problem, its easier to break the W component into 2 seperate components, here I've marked the components in Red & Pink arrows. ...
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### Earth gravitational field [closed]

If the gravitational vector field of the earth is something as in the picture above, then the net field would sum up to zero by symmetry, but why don't we experience weightlessness?
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### How is weight dispersed among multiple points?

I was recently viewing remembrance photos from the 1995 bombing of the Alfred P. Murrah Federal Building on MSN news where slide nine shows a photo of firemen teaming up to carry a $40'$ steel bar ...
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### How the apparent weight varies due to the rotational motion of Earth?

I learned that as the earth rotates about its axis, the bodies on the earth also follow a circular path. In most books I read, they give the example of a person standing on a weight balance at the ...
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### What is the explanation of weight in terms of general relativity?

In GR a massive particle falls along geodesics of curved spacetime because there is no “force” on it and it has to follow straight lines. But how can the weight felt by an object on the surface of ...
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### Will a bathtub full of water weigh more if I add something that floats in the water?

Let's say I have a bucket or something bigger, like a bathtub full of water. I weigh that bath and get some value, $x$. Then I add a small boat made of wood to that bathtub that doesn't touch the ...
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### the weight of a hose with water passes through it [closed]

a hose is connected to a water supply at the ground and is held by hand from point B. I want to calculate the tension at point B. but how does the resultant weight (W) of the hose will change if water ...
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### Is there a difference between Weight and Force of Gravity?

Is there a difference between Weight and Force of Gravity or they just mean the same thing? My textbook does not clarifies this point.
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### What is the weight equation through general relativity?

The gravitational force on your body, called your weight, pushes you down onto the floor. $$W=mg$$ So, what is the weight equation through general relativity?
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### Is there any weight diffenence between sealed/unsealed bottles? [closed]

I have to prepare my chemical report about CO2 molecular mass. I searched and got a sample report from internet. I read it and I can't understand this. Weight of flask covered with glass cover = ...
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### Ought we say 'body mass', rather than 'body weight'?

I'm asking in the context of medicine, where you're "massed" (or is it "weighted"?) on a scale. This answer beneath insinuates that 'mass' may be the preferred term, but it doesn't outwardly clarify ...
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### Why does a person carry more weight when sitting down?

Today, while shopping for a chair at a shopping mall, I saw this poster regarding the amount of weight a person is carrying when doing various activities. When standing upright, one carries 100% of ...
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### Does the weight on a car's wheels decrease with increasing speeds? [duplicate]

Ignoring the reduction in fuel weight as it burns, does the weight on a car's wheels decrease with increasing speeds? If so, by how much and is there a fomula for calculating that? At what speeds ...
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### Weight of mass falling through liquid

If I place a container of fluid on a scale and drop a non-buoyant mass into the fluid, will the scale read less as long as the mass is in motion downward as compared to when the mass is at rest on the ...
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### How do you determine weights from CG when there are more than two locations

On the internet they list ways to calculate weights based on CG when there is a weight on the left and on the right of your CG. Most of the examples show a box truck for determining the weight on the ...
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### Satellite Motion centripetal force

Once I read in a book that the centripetal force that keeps the satellite in its circular orbit around the Earth is approximately equal to its weight. My question is why the word "approximately" was ...
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### Why is torque sometimes reported in kg m, instead of the usual N m?

On various websites I see torque expressed as $\rm kg\: m$, but I was always thought that torque is $\rm N\:m$ or $\rm kg\: m^2/s^2$. These are clearly not the same, so why are they called the same, ...
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### Weight of an object without air

Consider a weigh machine and an object. Both are inside a case. Weigh the object. Then remove all the air in the case. Weigh the object again. If the weight of the object with air is M kg. What will ...
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### Does the order of the weight plates on the bar - matter?

Normally when people going to the gym and want to make "bench press" exercise using a bar with weight plates, the order of the plates (on both sides of the bar) is from the heaviest (internal) to the ...
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### If I drive East, how much lighter am I than if I drive West?

I'm at the equator. Suppose I am driving at x kph, in the direction of the Earth's rotation (i.e. due East), I presume that the force my vehicle exerts on the ground is less than when I am stationary. ...
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### Effect of temperature on specific weight

How much of an impact has a temperature difference when the specific weight of an object in water is measured, e.g. the weight of a mussel in seawater. Would the two scenarios yield the same specific ...
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### Compression of gas within a partitioned cylinder

I have been doing some thought experiments, and would like some help in thinking about two situations: a) There is a (metallic) container on a weighing machine. This container has an upper chamber ...
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### What's the difference between gravitational attraction and weight? [duplicate]

What exactly is gravitational attraction? In my textbook it was quoted " all objects both tiny and large objects are attracted to the earth. This is known as gravitational attraction, or the force due ...
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### Do the weights of two liquids not add when mixed?

I was given an interesting dilemma today. A co-worker saw me adding a liquid (Diisopropyl ethylamine AKA DIPEA) to a flask filled with another liquid (Tetrahydrofuran AKA THF). I needed to weigh out ...
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### Do vibrations increase an object's mass or weight?

does a vibrating object recieve an increase of mass or weight? and if it does, at what frequency or intensity does it need to vibrate at, and what is the rate of increase? is there a formula for it? ...
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### What is the function of this complicated tensioning system?

I saw this arrangement for tensioning overhead cables from my train window (schematic below). Why not just have one pulley wheel leading directly to the weights? What function do the additional ...
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### What is the modulus of Tension Force in the simple pendulum experiment?

The forces acting on the bob are Tension of the string and Force of Gravity, which can be decomposed into two components: Normal or Radial one, which is antiparallel to Tension (mgcosθ) and the ...
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### When we do pull-ups, does the bar takes more weight than when we hang down on the bar?

When I do pull-ups, I feel I push down to the bar. But does the bar really take more weight than just hang down? For people who don't know pull-ups and hang down, here is an illustration. Left: Hang ...
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### Why is 1 newton meter=.225 lbs force?

This is a general question regarding force (mass x acceleration). I understand 1N =1kg mass x 1 m per second sq) all this basically tells me is that the force is proportionally increased and ...
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### What is the difference between weight and mass?

My science teacher is always saying the words "weight of an object" and "mass of an object," but then my physics book (that I read on my own) tells me completely different definitions from the way ...
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### How to calculate the max load a metal bar can hold?

How would one calculate the amount of weight a steel bar could hold before breaking? Apologies for the terrible diagram. So if I had a steel bar of the length 18in, and the cross-section with a ...
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### How to calculate weight of an object orbiting another object?

How do we calculate weight of an object which is orbiting another bigger object in the space? For example, comparing the pair of Sun-Earth, Earth is orbiting Sun due to the force applied by Sun on ...
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### How do you explain the “weight” of helium?

If weight is measured as M * g (mass x gravity), then how does the "weight" of a massive helium filled balloon negative? Let's say you have a 63,000 m^3 helium balloon. The mass of the helium is ...