# 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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### Can anyone explain how this rod (experiencing shear stress and deflection) mysteriously resists the downward force from the weight of the mass?

This fascinating and, in my opinion, very unique question came out of a competition lab I did in a general engineering course. I will leave out or change info about the lab to make this question more ...
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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 ...
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### Does a charged capacitor weigh more than uncharged? [duplicate]

I know that charging a capacitor only moves particles from one plate to the other, so the total amount of charge in the capacitor does not change, nor does the total number of particles. However, the ...
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I have a doubt related to distributed load system. When we apply an external force on the distributed load system, they are treated differently. The above line is what confused me. Here is an image of ...
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### Normal force and weight of a body

Ok let us take an example of a book placed on a table and in first case let us say that it is on an aeroplane at rest. Since the book is at rest this means that the weight is balanced by the normal of ...
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### Why does the liquid column in a capillary tube exert pressure as its weight is already balanced by surface tension?

I read that the meniscus, due to surface tension, exerts an upward pull to the liquid column below it. The water rises to a height until the weight balances the pull. Now liquid exerts pressure ...
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### Weighing scale reading in two different situations in which both my and the scale's proper accelerations are the same

If I'm standing on a weighing scale on the surface of the Earth, both I and the scale have the same proper acceleration of $g$ upwards, yet the scale reads non-zero. But if both I and the scale are ...
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### Work done to slide a circle over another circle assuming a horizontal force and no friction

There are two ways that I think that this problem may be able to be solved, however, they give different answers, therefore at least one of them is incorrect. Let's start with a simpler problem, the ...
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### Why does frictional force depend on normal reaction and not the weight of a body?

One possible explanation I came across for this was that if you have an external force and you press on the body, the body's frictional resistance to motion increases and hence it should depend on ...
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### Would the weight of an object increase if the pressure of the surrounding is increased? [closed]

I'm thinking something like if I take a box and place a weighing machine and an object inside it...then if i increase the pressure inside that box would i observe any change the weight of the object? ...
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### What saves bike rims when one rises before hitting small obstacles at full speed?

When riding a road bike with thin tires over small obstacles such as tree roots, there is a risk of damaging the tires. Cyclists argue that rising off the saddle will all but eliminate the risk of rim ...
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### What is weight at the particle level? How EXACTLY do atoms exert weight on each other?

This is what my intuition says about how the concept of weight works in a solid. The light brown arrows are the vectors of gravitational force, the light gray parts are the electron clouds around ...
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### Do things on top of magnets make the magnet heavier

Say you have a magnet set to repel a platform (a really strong magnet) and then load that platform with 1000 pounds worth of stuff does that then get transferred over to the physical magnet
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### Atwood Machine inside Elevator

Suppose we have a system as shown in the diagram above, inside an elevator, where object $Q$ has mass $M$, object $P$ has mass $m$, and $M>m$. When this elevator accelerates upward with ...
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### Newtons 2nd law experiment

I am conducting an experiment using a cart and pulley system. I am trying to measure the force that is accelerating the cart by using a dynamo-meter and pulling in the opposite direction. I think that ...
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### Can mutual inductance be used to measure weight? [closed]

It's been a long time since I completed my engineering degree and haven't worked in the industry since graduation so please allow for some supidiy on my part. I am trying to determine whether it would ...
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### 60 kg on earth is 60 kg on the moon [closed]

I'm writing a trivia quiz and intend this question, which dates from a high school physics test I took in 1972. An astronaut tips the scale at 60 kg while on earth, what will she be if she steps on ...
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### Should the weight of the lifting surfaces of an aircraft be deducted from The weight used to calculate the C of G of the aircraft?

If the aerofoils are creating lift they are doing the work to lift the helicopter. When the helicopter is hovering, the blades are carrying the weight of the entire ship. The forces on the aerofoils ...
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### Why do we treat weight as acting on the object?

When drawing force diagrams I am really struggling to understand why we put the weight of an object as a force acting on it, rather than as a force acting on whatever else there is around it. For ...
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### Definition of weight

As per CGPM the official definition of weight is "The weight of a body is the product of it's mass and acceleration due to gravity." When I searched for gravity it defined gravity as the ...
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### How much is my weight in Newtons? What is my Mass?

We refer to our earthly weight in "pounds" or "kilograms". The Force I put on my scale is mass × acceleration = mass × 9.8 m/s^2. My scale reads 98 kg, yet the units of Newton are kg m/s^2. Do I ...
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### How to differentiate between mass and weight? [duplicate]

Today while solving numericals in my physics book I got struck over a question which said "A hammer weighing 1kg .....". In the question they told that the weight of hammer is 1 Kg but when i checked ...
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### How do you calculate how heavy you feel from negative g forces? [duplicate]

My physics tacher told me that to calculate the weight that you feel from negative g forces you have to devide your mass by the negative g force, but then my friend told me that it did't make sense ...
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### How much weight do you feel during negative g-forces?

My physics teacher told me and some other students that when you experience negative g-forces, your weight equals: $$\frac{mass}{g_{force}}$$ So when the g-forces equal -4 g your mass will be: \...
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### Converting Gas volume to Liquid Volume

For a test setup, I need to set CO2 flowrate as 130 L/h but I do not have a flow measuring device to set it. So I made one device as mentioned below. Once I set the flowrate, I will remove containers/...
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### Measurement of Changes in the Weight of a Heavy Object

I am searching for an elegant way to measure small changes in the weight of a heavy object (a potted tree) over the period of one year. However, I do not need to know the exact weight of the heavy ...
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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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### 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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### 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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### Is the notion of 'weight of Earth' meaningless? [duplicate]

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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### 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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### 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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### 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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### 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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### 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