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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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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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214 views

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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2answers
84 views

Where does the buoyant force come from?

If I place a cube in water, the force at the top of the cube, F1 will be Ahρwg. Where, A = cross-sectional area h = height at the top ρw = density of water g = acceleration due to gravity All this ...
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Load weight on a horizontal wireframe ladder

I'm wondering about the following scenario. A wire cable ladder is mounted horizontally and a person uses the rungs to navigate from one end to the other (imagine monkey bars). If the wire cable is ~...
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2answers
170 views

Spring balance with mass in spring

Suppose I have a spring balance kept horizontally on a table, and there is a block of mass hanging from it say from the edge of a table through a frictionless pulley. Let’s say the spring in the ...
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2answers
33 views

Finding pressure of an object whose weight is known is standing on a tilted surface

In the following picture, the striped square represents a box that is standing on a surface that is aligned at $\alpha$ degree angle. Box stands on top of point $T$ (that I forgot to mark on paper), $\...
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2answers
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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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1answer
102 views

changing force without mass or acceleration alteration

A water tank put on scale measuring $50 kg$ , inside the tank a fully submerged balloon tied with a thread to the tank bottom. If the thread was cut, will there be a different reading on the scale ...
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1answer
84 views

Applying downward force on someone without adding to their weight

I am creating a scenario for a superhero comic, and need help with an idea. I'd like the solution to be based in scientific theory, or at least scientific fantasy, as opposed to resorting to simply ...
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1answer
28 views

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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1answer
36 views

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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1answer
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Conversion between mass units

I am enrolled in a course related to physics, and converting between mass units is so tricky for me. I always treat in my work only in SI units and maybe MKS units, at level of weights, I find it easy....
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The Effect of Movement on Readings of a Scale

I am holding a book in my hand and standing on a scale, the scale reads X Newtons. Then at t=1 second, I start to move the book, and by t=2 seconds, the book is at rest 0.5 m higher than its initial ...
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Does a lightning strike have a physical weight?

A lot seems to be unknown about lightning and it is possibly a source of dark energy at the instance of the strike. So if we were to place say a 10kg lightning rod (earthed) on a set of insulated ...
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0answers
37 views

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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0answers
37 views

Audio anomaly identification

I left an audio recorder in the forest in many different locations for fauna identification. I am collecting subjects on my audio recorder that are clearly not in the frequency range of any animal ...
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0answers
202 views

Perceived weight in dumbbell vs. barbell

I had an observation today at the gym when I was lifting weights. Lifting a dumbbell of 10 kg on each hand was as difficult for me as lifting a barbell with 5 kg on either end. It's true that the bar ...
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405 views

Apparent weight can be negative?

Apparent weight can be negative ?? If yes then what conditions are required for this ? If we change the frame of reference is there any change occur in apparent weight due to these changes ?
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The helium balloon and buoyancy

Well I noticed something with a helium balloon which a little weight was tied to its rope to avoid it flying away. When the weight is on the ground and the rope is taut, I pulled it down a little and ...
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0answers
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Why does a digital body weight scale give you the wrong result when put on a soft carpet?

Why does a digital body weight scale give you the wrong result when put on a soft carpet? In particular, it gives you a smaller number. My reasoning is that if the carpet compressed "fully" (which I ...
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514 views

Force exerted by pulley on ceiling

I read in my book that when a pulley is accelerating it exerts more force on the ceiling than when it is still. I know the derivation and I can mathematically prove it but I'm unable to get my head ...