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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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 really get confused about this $kgwt$ and mass. When I went through a question which says A body weights $700kgwt$ on earth surface. How much will it weight on the surface of a planet whose mass is $...
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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 of liquid with something swimming on it [duplicate]

I was wondering about the following situation: If you'd weigh a whole body of liquid and then let something float on it, how would the weight of the liquid change? E.g. if you could weigh a whole lake ...
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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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Pressure sensors underneath a plane to calculate position and actual weight of an object on that plane

To begin with, this is an academic project that has been physically done and now the virtual model has to be made (in our case, we're using LabVIEW, but that's irrelevant). Let's assume we have a ...
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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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Distributed load doubt

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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