# Questions tagged [applied-mechanics]

Questions about using applied mechanics to model engineering problems.

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### I need to determine the RPM of a rotating cylinder over which a silk thread is wound and is moving along in the fashion of a screw.

Recently I visited a sericulture facility in India and I saw that people there 'degummed' (https://www.youtube.com/watch?v=h13fctiTylI) silk in a batch process. As a Chemical Engineer, I thought of ...
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### How to calculate bending of shell

I'm an electrical engineer, so please bear with me :). I came across this situation and I tried to find some equations to solve it, but all I could find was some Finite Element Theory, and I was ...
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### Worm Drive Calculation

I have this setup: -Pully with a mass attached. -Worm gear drive to lower the mass with a constant speed. (Section A-A) Now if we look at the cross-section A-A, we can see the worm gear drive: ...
224 views

### How does friction help a car to turn?

I know that friction helps car to move forward. The engine of the car turns the wheels, and the tyres have to grip the road in order for the car to start moving forward. If there is no friction, tyres ...
293 views

### Two-way pulley system considering inertia of pulleys

This is the following question. [![This is how i tried, but I know it is wrong.][2]][2] This is our attempt but We can't seem to solve it with inertia.
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Previously, I was told by someone I trust well that a column can avoid buckling at the first critical load by applying the load "instantaneously" with a magnitude between the first and second critical ...
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### Design a trolley with four casters

I need design a trolley with four casters, the four casters are installed on the four corners of a 460mmX405mm metal plane. And the load will be a cubic 380mmX225mmX350mm (Height is 350mm), weight ...
537 views

### Reaction forces in a structure

I have the following structure, in which I am failing to calculate the two reactions: Cz (apparently vertical) and Dz, in the roller support of the beam. The beam length is 7.5 m, the reactions Az, Cx,...
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### How I can compute cutting processes with continuum mechanics?

In YouTube I have seen various videos where someone cut with a sword into hard objects and has cut that into pieces. For example: https://www.youtube.com/watch?v=EVCWGwvctt4 Given the mass, the ...
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### Reaction force on a beam

I have the following problem most of which I have calculated but have a difficulty with the beam under angle. The angle is 56,30 degress. I just cannot figure out how the forces there are acting - the ...
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### Applications with combination of high friction and low wear?

What would be some common applications involving high friction and low wear rates? for example, gear-driven mechanisms which require high friction between the gear teeth but ideally low wear between ...
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I want to build a drone that can carry around 7lbs. Is it possible to make a drone that can carry that much weight using electric motors without it being over /$500? 2answers 4k views ### Why do we neglect the radial stress in case of a thin pressure vessel? A cylindrical or a spherical pressure vessel, having inner diameter$d$& thickness of wall$t$, is called thin if$\large \frac{t}{d}<\frac{1}{20}$.$\bullet$Thin cylindrical pressure ... 1answer 1k views ### Is there a way rotate a wheel in a single direction but have opposing motions every 180 degrees? In order to give you a good idea of what I want to accomplish suppose you have a telescope mounted on a single rod extruding from the ground. The telescope is free to move such that you can tilt it to ... 1answer 1k views ### “u” vs “n” orientation of channel profiles: why difference in strength? For example, metal tape measures can be extended and stay straight when in a "u" orientation, but collapse the other way round. I presume the same phenomenon is why metal shelving has sheet metal on ... 1answer 303 views ### Isotropic materials and levels of stress I was wondering if I was to have two objects both made of isotropic materials such as steel and aluminum and the two objects were the same geometry and I was to apply the same load and boundary ... 2answers 333 views ### Mechanical Linkage Question - Velocity Diagram Can someone confirm the velocity of B, given point C has velocity of 3 units/s down and point A has a velocity of 5 units/s upwards? My approach has been to resolve for the tangent velocity component ... 5answers 7k views ### How can I improve traction on a wheeled vehicle yet reduce friction? This is inspired by a project I undertook for my Physics class last year; I'd like to apply it in the future. Background: For the project, I and a few classmates were required to build a small car ... 3answers 13k views ### What is the difference between the Polar Moment of Inertia,$ I_P $and the torsional constant,$ J_T \$ of a cross section?

This question is so fundamentally basic that I am almost embarrassed to ask but it came up at work the other day and and nearly no one in the office could give me a good answer. I was calculating the ...
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### Find the load applied to each wheel by the anti-roll bar

Wikipedia says that an anti-roll bar is a device that balances the weight of car between the wheels, preventing it from rolling. I want to simulate this in a game, but I don't know the equations ...
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### Final speed of a truck on a slope?

I have a truck which weighs 190 kg and will travel 100m down a 38° slope. How I can find the trucks speed at the end of the 100m?
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### Bearing Alignment Moment Reactions

I'm trying to analyze a simple shaft supported by two bearings and subject to a single point load. But I keep coming across assumptions that only consider the vertical reactions and neglect the moment ...