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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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?

Statement 1: "A race car weighing, say, 1000kg has an "effective weight" of only a few kilograms when it cruises at a speed of, say, 200km/h." Statement 2: A road cyclist with a combined weight (...
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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
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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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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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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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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 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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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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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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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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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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