Questions tagged [forces]

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Optimizing the layer lines of a 3d printed part, based on subjected forces

I was directed here from the 3d printing stackexchange... For years I have been fortunate to only have had to make 3D prints that don't require a large amount of force on them. But recently (since ...
nick carraway's user avatar
0 votes
2 answers
43 views

Is it possible to simulate inertial load using brake?

Suppose to have an engine attached to a flywheel, I add power, the flywheel start to rotate and oppose a resistance to motion. More power, more resistance. I'm wondering if I can simulate this ...
Mattia Piron's user avatar
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1 answer
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When something undergoes angular acceleration (like a bar) how does the distribution of forces look along the bar?

This is something kind of explained with propellers and turbine blades but I'd love some good explanations. Thank you!
Mechs_and_Specs's user avatar
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3 answers
75 views

When a catapult is cocked back, is the energy stored primarily in stretching of the rope, or bending of the wooden frame?

Referring to an onager or catapult like this: I searched it but couldnt find a good answer. I believe that theoretically it could work either way. Likely its at least a little bit of both, but where ...
Drew's user avatar
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2 votes
1 answer
173 views

How do I relate tongue weight to weight x distance?

The specification for car hitches routinely state the tongue weight, but do not specify how far that weight can/should be applied. What am I missing? Shouldn't the maximum bending moment be the one to ...
Sam7919's user avatar
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2 answers
111 views

What Tension Force will make the bolt to pull out of the nut?

I know how to calculate the bolt capacity for tension and shear, also how to check bolt bearing against different elelment such as steel or aluminum. There is a hanging bolt by which a bar is hanging ...
Ghilman Dilshad's user avatar
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0 answers
12 views

What forces act ona key in a shaft during the work of spur gears?

What forces act on a key in a shaft during the work of spur gears? Are the forces which act on key only from the torque of shaft or also forces from gears mesh and work?
Mlodzian's user avatar
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3 answers
39 views

Why does restoring force of a spring vary directly with elongation or compression?

The restoring force is electromagnetic in origin, having to do with atomic/molecular interactions. Both electrostatic as well as magnetic forces vary inversly with the square of distance. $F_{_{EM}}\...
Nietsniewton's user avatar
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1 answer
185 views

Calculating forces of TV wall mount with long extended arm. Need help with Physics, torque vs force and anchor requirements

I'm planning to install a wall-mounted TV with a very long arm on a plasterboard wall, although conventional wisdom advises against it. The TV mount is 45cm wide with holes for 6 screws. To address my ...
Mikel's user avatar
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1 answer
22 views

structural engineering - calculating moment & shear forces for a custom floor mounted hangman's style heavy bag stand?

I own a martial arts facility and I have a few hangman's style (single arm) heavy bag stands that a fabricator friend made for me. These will be used to hang 6' heavybags (100lbs each) attached to a ...
Jon's user avatar
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0 answers
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Practical question on force in a molding application

I have a molding machine that is holding a spring loaded mold closed. The mold is basically two blocks of steel, but one half has a slide system that is pushed open by a number of gas springs. Those ...
wenh12's user avatar
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1 vote
0 answers
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How to calculate force / torque between permanent magnets

Given two permanent magnets (for instance, made with ferrite or neodymium with shape of: cylinder, disc, toroid, etc), how can I calculate the force / torque between those magnets? Are there any ...
Julio Otuyama's user avatar
0 votes
1 answer
17 views

Is this axial load or radial load

I am confused by Axial loading mentioned in the figure below. The long black line is a piece of rubber passing over different rollers. And at the point "Axial Load" a weight is attached. The ...
Zaffresky's user avatar
1 vote
1 answer
47 views

Hertz contact pressure formula for cone on a plane

Can anyone please point me to some literature that contains formula for Hertz contact pressure for conical body on a plane? I know that there are general solutions that probably cover also this, but I'...
Grega's user avatar
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125 views

Find the Angles 1 to 3 so that the Reactional Forces Become Minimal

My question regards the following system: This system is supposed to be located in a plane, so it is 2-dimensional. It consists of three rods, which are connected at the ends. Meeting in the hinges $...
San Chairudo's user avatar
1 vote
1 answer
90 views

Passive mechanical element that can act as counterforce for a spring

An elavator is a moving cabin that gravity acts on. On the scales of the typical elevator application (a skyscraper for example), gravity is constant. So the gravitational force can be counteracted by ...
Quantumwhisp's user avatar
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0 answers
25 views

How can I transmit the force induced by magnetic torque?

So I'm working on a project where I'm trying to transmit the force induced by magnetic torque onto people's hands, thereby making it a haptic feedback system. This is the stucture that I designed to ...
NakedRaccoon's user avatar
1 vote
2 answers
128 views

A question on understanding the nature of static equilibrium

In the statics lesson, we do not think about the effects of forces on objects. In other words, we do not assume that an object can break, bend or twist. In the same situation, we can combine different ...
Bilgehan Yılmaz's user avatar
0 votes
1 answer
123 views

Understanding the nature of Force and Moment FBD diagram

Hello, I am Civil engineer Bilgehan Yılmaz. First of all, I would like to ask a question about basic statics, I modelled my question below. The following forces are applied around a wooden stick with ...
Bilgehan Yılmaz's user avatar
0 votes
1 answer
147 views

Moving internal forces for the sake of stress

I am studying mechanics of materials and I'm confused with determining internal forces for the sake of stresses. Consider this diagram: (just for visualization. from Beer Johnston book) when ...
Jacob Martina's user avatar
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2 answers
123 views

How to calculate stiffness to weight ratio of one big tube vs two small tubes (see drawing)?

How does one calculate the stiffness1 of (a) one big diameter tube and (b) two small diameter tubes that are a certain distance apart? I have made a drawing that illustrates and specifies the question:...
aehhhhmm's user avatar
0 votes
1 answer
181 views

How to calculate force acting on axle from hub motor with known torque?

In some electric bikes, a motor is mounted to the hub of the front wheel. When turned on, this hub motor applies a torque, turning the wheel, reacting against the ground, with a resultant force acting ...
Chuck's user avatar
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0 answers
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Shear stress and force

I have got a cantilever beam subject to forces and moments. I found the shear force diagram and moment diagram. I am having trouble finding the shear stress distribution and normal stress ...
Ali's user avatar
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0 answers
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Truss beam like structure strength per height

The second beam is 2x the height of the first one. Is 1 stronger then 2 to bending force (arrow shows direction, supported on the sides)? If it does, I'm trying to figure out why, because they both ...
Simon's user avatar
  • 115
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2 answers
76 views

Is a centrifuge force-based levitation system operable in the real world?

In the sci-fi comic Betelgeuse, the artist Leo presents a flying car with an unusual system for levitation and propulsion. The interesting point is that at the end of the comic, there is a page on ...
totalMongot's user avatar
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0 answers
36 views

How to calculate the force required to move this pawl that swings on a pin?

The structure (pawl) is rotating about a pin and is pushed forward by a spring. I want to calculate how much force it requires to push the pawl forward with the spring. Since the spring is only ...
Thomas Lukose's user avatar
0 votes
1 answer
39 views

Torque created at bottom left corner due to torque in centre of 2D box

If I have a 2D box with uniform mass of width $w$ and height $h$. I apply a torque $\tau_O$ to the centre of the box, labeled $O$. The box has a fixed point $A$ at the bottom left around which it may ...
Krys's user avatar
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0 votes
1 answer
72 views

How to calculate the mechanical advantage of torque reaction arms (or balanced articulated arms)?

So, I was trying to figure out how to figure out how much force I would need to apply to these articulated arms in order to make them extend or "contract", but I can't figure out. I tried ...
Fulano's user avatar
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-1 votes
1 answer
52 views

What is the name of the type of diagram that displays all the forces that act on a moving bicycle so that it stays in balance and does not fall?

If I were to draw a diagram the system of forces acting on a bicycle at high speed in order to demonstrate that the bicycle does not fall over, what is tat type of diagram called?
Luiz Ferreira's user avatar
0 votes
1 answer
50 views

Calculating forces on cables

I have to calculate the pull forces of Fab and Fac. I have used extended Pythagoras to find the length of AC and AB but I have no idea how to calculate the forces. I also tried to use cartesian ...
daan 's user avatar
1 vote
1 answer
154 views

How to calculate the volume of a partially submerged horizontal cylinder and the center of buoyancy?

I was wondering how it was possible to calculate the volume of partially submerged horizontal cylinders and the center of buoyancy considering that these horizontal cylinders are just the supporting ...
Clyde F's user avatar
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0 answers
35 views

Preventing u- tube effect on a fluid

Say you have two cylinders, one fixed bigger outer cylinder and the other is free (lets say a straw with a tapered end 1/3 from the bottom. As you push the straw into the medium (fairly dense viscous ...
blockie's user avatar
0 votes
1 answer
29 views

Why Do the Fingers in Mechanical Pencils Fly Out?

In this video(https://www.kidzsearch.com/kidztube/watch.php?vid=65fbcb9ca), at timestamp 0:27, it says that in mechanical pencils, the fingers have a taper in them that results in them flying out ...
MeltedStatementRecognizing's user avatar
0 votes
1 answer
73 views

Distributing force over multiple springs evenly

I am trying to build a big push button in the shape of a rectangle. I have 4 springs at each corner (below the plate), but the problem is, that because of button's size, if I press down on one of the ...
Adam's user avatar
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0 votes
0 answers
271 views

Calculation of Cutting forces (tangential , feed and normal) in CNC Milling Process

I am doing my fyp project on 5 axis cnc milling machine.I need to calculate forces on each axis as mentioned in the below picture I first calculated spindle power from https://www.machiningdoctor.com/...
Hamza Zaheer's user avatar
0 votes
1 answer
149 views

Finding hoop stress in a half-cylinder

I have a half cylinder which is significantly thick but not very long. In the half cylinder, a force $F_{app}$ is being applied over a certain area as shown in the figure below: I have to find the ...
s6292_1997's user avatar
0 votes
1 answer
105 views

Angle of attack for torque calculation from buoyancy force

To calculate the torque caused by the buoyancy force I need the length and the angle but what angle should I use? Should I use the angle of from the center at the bottom of the angle from the center ...
Babar's user avatar
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0 votes
0 answers
120 views

Do automatic quick release mechanisms exist?

I'm imagining something like a cable tie that would automatically release after a certain amount of tension was applied. I guess a very basic way to do it would be to use different diameter strings ...
olly's user avatar
  • 101
0 votes
1 answer
45 views

center of mass of rotating rod system

I have a system with a rot connected to a motor and I need to determine the center of mass to calculate the moment caused by gravitation. To illustrate: I am uncertain about how to do this, is it a ...
Nil's user avatar
  • 61
1 vote
2 answers
176 views

Dynamic forces in Simulink

I have the equation of motion: $a = \frac{1}{m} \left( F_1 - F_2 -F_{fric} \right)$ where a is the acceleration and m is the mass of an object. $F_{fric}$ is the friction calculated as: $F_{fric} = B \...
Nil's user avatar
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0 votes
1 answer
52 views

Movement caused by buoyancy

I have a rod that can rotate about a point, the rotation is caused by the buoyancy of 3 balls connected to the rod as in the picture: I need to calculate the angle at different heights and the ...
Nil's user avatar
  • 61
1 vote
2 answers
785 views

Calculate compressive stress in shaft/key surface from torque

When designing shaft keys we calculate compressive stress in hub/shaft/key and compare it with allowable stress. The usual formula is $$p = \cfrac{F}{A} = \cfrac{\cfrac{M}{R}}{L_e \cdot t}$$ where $p$ ...
Trolobezka's user avatar
2 votes
1 answer
113 views

What is the force required to puncture through a sheet of foil against an anvil?

A hardened steel contour with a sharp edge presses against plastic foil which lies on top of a hardened steel anvil plate. What would be the force required to punch through the foil? I am familiar ...
jessegerritsen's user avatar
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0 answers
37 views

precast construction, shear force and home gym

I have home gym machine (see below). I am in building constructed with precast construction (https://en.wikipedia.org/wiki/Precast_concrete). Builder has refused me to assemble the equipment because ...
user1578026's user avatar
0 votes
2 answers
57 views

I am designing a light that is hung from the end of an arm. How do I calculate the amount of force on the fastener where the arm attaches to the wall

I have a light hanging from an arm that is attached to the wall. I need to make sure that the fastener at the wall end is able to hold the weight. How do I calculate this?
Mike R's user avatar
  • 3
0 votes
1 answer
87 views

Calculate uphill efficiency on different gears

I was interested to find whether it would be more efficient to climb a hill on a lower gear, so I did some calculations. I have the following data of a custom vehicle: Gear Drive force (N) Max speed (...
php_nub_qq's user avatar
0 votes
2 answers
61 views

Force required for a power generator in a coal power station

I am unsure about how to word this question properly and I assume that it might take two directions probably because of the unknown variables involved but here goes... On the actual physical power ...
Blurry Sterk's user avatar
0 votes
1 answer
97 views

Dynamic Analysis Of A Four-Bar Linkage Powered By A Motor

Below is the dynamic analysis for a single rotating link which is driven by a motor. It shows the 2d front view and the 3d full view. The equations for the analysis require knowing the location of the ...
Jesse Flynn's user avatar
0 votes
1 answer
297 views

How to calculate wind impact to DIY solar panel array frame?

I'm trying to figure out the calculation for amount of force against the poles/ground I have going up out of the ground, to hold an array of 3 solar panels (9ft by 5ft combined roughly), where each ...
I like to code's user avatar
0 votes
2 answers
759 views

Pull out force for a 5/8" tapped bolt

I am looking for the pull out force on a 5/8" bolt tapped into 1/4" thick tube steel. Does the thickness of the steel need to match or be greater then the bolt diameter?
mark's user avatar
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