All Questions
Tagged with weight free-body-diagram
41 questions
4
votes
2
answers
328
views
Is the weight of a floating body zero?
My physics book says that the apparent weight of a floating body is zero which is understandable since the buoyant force cancels out the gravitational force on the body.
However, further in the book ...
0
votes
0
answers
45
views
A bird in a container [duplicate]
Suppose there is a bird in a sealed container, and the container is on a scale that measures its weight. The bird is flapping its wings to hover in the middle of the container. If the bird flaps its ...
- 1,148
0
votes
1
answer
36
views
Two weighing scales compressed inside a solid frame
Two weighing scales are placed on top of each other at the bottom of a solid enclosed frame.
At the top of the frame a linear actuator is attached.
The linear actuator can extend and press down upon ...
1
vote
2
answers
200
views
Is it possible to calculate weight with air pressure?
i was wondering if it was possible to calculate a mass of object on top a bag filled in with air
as compared to a bag of air filled up with nothing on top of it
assuming the air pressure going into ...
- 11
1
vote
1
answer
201
views
Does Weighing machine measure normal force or gravity or both?
A weighing machine measures the normal force applied by an object.
However 2 forces act simultaneously on the machine ( normal and mg )
Under normal conditions (a=0) N=mg .
So this would mean that a ...
- 11
12
votes
6
answers
1k
views
Is the weight of something being dropped the same as the force of something being static?
If I have a block of let's say: 10 kg and I put it over my foot in a static manner, what we know from static mechanics is that my foot is opposing the weight of the 10 kg mass with the same force in ...
- 165
2
votes
3
answers
137
views
Weighting unbalanced object
Hopefully my question is not out of order in this site.
I am trying to weigh an object that is too wide/long for my weight scale. If just put it on top of it it tips over.
So my solution is to place ...
- 123
7
votes
4
answers
973
views
Does an open or a closed cage of canaries weigh less when they are in flight? [duplicate]
Okay this is a bit of an old classic, but I don't think I've heard a good reasonable explanation for what happens:
If you put a cage of canaries on a weigh scale and they take off does the scale still ...
- 630
0
votes
1
answer
42
views
How much weight would the scale show if we get on a scale with springs on top of it? [closed]
Lets say we have a scale and on top of the scale there is a big spring and we get on top of the spring. Suppose we weight 70kg and spring itself weights 2kg and after we get on the spring we compress ...
- 103
2
votes
1
answer
645
views
Weight at an angle
My physics knowledge is pretty basic, somebody suggested that I'll get the definitive answer of below question here.
Imagine a barbell of mass m (kg) which is ...
- 23
0
votes
1
answer
63
views
Does the weight of a car increase under cornering? [closed]
Lets say we have a car with a mass of 1000kg, and lets say the car turns a corner fast and pulls around lateral 3g. Since under normal condition car weights 1000 x 9.81 (1g) = 98100 Newtons , will the ...
-1
votes
3
answers
139
views
Do you weigh more with suction cups under your feet on the scale?
The scale weighs everything on top, including the air. So if you turn on the suction cups, and they suck vacuum (i.e., air is taken out), the scale will give a fraction less weight (I didn't calculate ...
- 3,368
1
vote
1
answer
199
views
Weight Distribution when lifting furniture with a partner [duplicate]
Help solving this question would be appreciated: As a short person at 5'3'' with short arms, I find it challenging to lift furniture with a taller person, because they always naturally lift the object ...
- 11
0
votes
1
answer
47
views
Weight on a scale
imagine that you're at the baggage weigh in point at an airport. your luggage is on the scale and you try to cheat the price by pivoting your heel on the ground and toe beneath one end of the suitcase ...
- 1
2
votes
0
answers
115
views
Is there a formal definition for apparent weight?
Is there a formal definition for the apparent weight that does not depend on the situation?
For example, when a body stands on a solid floor the apparent weight is defined via force that floor exerts ...
- 5,230
3
votes
3
answers
2k
views
How to find apparent weight?
Is there a universal formula for finding the apparent weight of an object in a particular situation? I heard that it is the net of all forces acting on the object in the vertical direction? Is this ...
- 33
3
votes
2
answers
450
views
Are normal force and apparent weight the same?
Are normal force and apparent weight the same thing? I'll let ya know the context from which I am asking this question:
Is there a normal force on an object submerged in water?
So, from what I ...
- 811
13
votes
3
answers
5k
views
What impact does air have on our weight?
Although air is light, it is fluid. So it must exert upthrust on people. So does it mean, in fact, we are heavier than our weight? Also, the gravitational acceleration is bigger than its value?
- 421
0
votes
2
answers
47
views
Simple dynamics im really confused
So my question is a little dumb: if an object on a scale has a weight that points downwards and the scale exerts normal force on the object upwards, cancelling the forces acted on the object then what ...
- 5
-1
votes
3
answers
936
views
Why is weight in a fluid not equal to the buoyant force?
We know that, weight is the normal force acting on us. And for this 'normal force' to exist 'something' has to be under us. My question is when we're in water on any other fluid, is that fluid that '...
- 811
0
votes
1
answer
74
views
Why is the weight of object is not included as a force pushing an object down in fluid?
In fluid mechanism, I have one doubt always,
When calculating the force upon object
They said force pushing object down is
$F=PA$ ($P$=atmosphere pressure, $A$=surafce area of object)
But why don't we ...
user315475
0
votes
3
answers
93
views
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 ...
- 103
1
vote
1
answer
182
views
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 ...
- 195
1
vote
3
answers
1k
views
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 ...
- 29
0
votes
2
answers
57
views
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 ...
- 213
3
votes
3
answers
2k
views
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 ...
- 8,040
3
votes
1
answer
130
views
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 ...
- 71
0
votes
6
answers
551
views
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 ...
- 127
2
votes
4
answers
1k
views
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 ...
2
votes
3
answers
618
views
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?
- 367
0
votes
1
answer
2k
views
Why do scales measure normal force not weight?
From what I understand, weighing scales measure the normal force acting on the person on the scale. They do this by measuring the displacement of a spring with a known spring constant. Shouldn't the ...
user193025
0
votes
3
answers
260
views
Weight of objects
I recently observed that on a weighing machine(rectangular) a object weighed the same as the half portion of the same object with it's other half hanging out of the boundary of the machine (The ...
- 31
3
votes
2
answers
1k
views
Does a scale weigh a bee flying inside a box?
This question is very similar to this one or even this one except some minor differences.
The box is much larger than the bee.
The box has no top cover.
The bee is flying still in the middle of the ...
- 273
1
vote
2
answers
132
views
Does air resistance give a falling skydiver weight?
An observer in free fall is weightless as he is accelerating at 9.8 m/s^2. However, when a skydiver jumps from a high plane, his acceleration gradually slows until becoming 0 m/s^2 at terminal ...
user94771
1
vote
5
answers
358
views
Reduced-gravity flight (A300 0-G): what is actually reduced?
I doubt I can hide from the effects of gravity when I'm close to Earth. We usually don't question this biker is fully experimenting gravity:
Source.
But with the well-known "reduced gravity" ...
- 183
0
votes
1
answer
3k
views
How is a strength of a pull spread across two springs?
I started thinking about it when I came up with a puzzle which is probably way too elementary for this site, but it is hard for me to understand clearly.
I just bought this small scale thing
and I ...
- 103
0
votes
1
answer
350
views
Why isn't it possible to use the component of the weight in the direction of $𝑅$ to find $𝑅$?
Say, in the example below, the weight $mg$ of the object is $800N$. To find $R$, the conventional method is to use $R\sin(28^\circ) = 800$.
But why isn't it possible to use instead the component of ...
- 1,546
13
votes
4
answers
20k
views
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 ...
22
votes
9
answers
13k
views
Does the weight of an hourglass change when sands are falling inside?
An hourglass H weighs h. When it's placed on a scale with all the sand rested in the lower portion, the scale reads weight x where x = h.
Now, if you turn the hourglass upside down to let the sand ...
- 333
17
votes
5
answers
15k
views
Bird flying in an open or a closed cage
Assume that you are holding a cage containing a bird. Do you have to make less effort if the bird flies from its position in the cage and manages to stay in the middle without touching the walls of ...
- 435
13
votes
1
answer
2k
views
A flying fly inside a sealed box on a scale
suppose there is a scale able to measure weight with an uncertainty of $10^{-9}kg$ . On the scale, an airtight plastic chamber is placed. Initially, a fly of mass $10^{-5}kg$ is sitting at the bottom ...
- 870