Questions tagged [statics]

Analysis of a system of bodies where all forces are in balance and there is no motion relative to a chosen reference frame.

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1answer
21 views

Water column's pressure canceling out problem and it's microscopic point of view

If you see my horrible reference picture, you will see that the U shaped tube is placed inside the field where gravitational force exist. And the bottom of the tube is opened, tube is filled with ...
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If a Triangular Lamina is Held Horizontally by 3 Vertical Strings, What would be the Tensile forces developed? [closed]

Suppose the three Strings (mass less) at A B and C hold the triangular Lamina in a purely horizontal position while remaining perfectly vertical. Now by pure imagination we can visualize that the ...
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5answers
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Does putting a thin metal plate beneath a heavy object reduce the pressure it would have applied without it

My dad bought an earthen pot and he kept it on our glass table. Worried that the glass could break on filling the pot with water. I kept a metal plate beneath it. At first, it seemed like a good idea ,...
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How do we decide which tension forces get included in the force- and torque-balance equations?

Consider a static equilibrium problem like the following: The uniform boom shown below weighs 700 N, and the object hanging from its right end weighs 400 N. The boom is supported by a light cable and ...
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60 views

Two standing sticks with a hinge, seems to lead to a paradox?

I have kind of a paradoxal question about two sticks connected through a hinge that rest on a frictionless floor at the bottom and frictionless walls on each side at the top. What are the forces in ...
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1answer
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Why the dust on the wing cannot be cleaned by air flow? [duplicate]

I recently saw that the dust on the airplane's wings are frequently cleaned by some human workers (generally after every trip, workers clean the fine dust on wing's surface by hands). But I have a ...
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1answer
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How to prove that objects have nonzero torque when center of gravity is outside area of support?

I’ve been learning the concepts of static equilibrium and the book I’m using is providing examples of objects that are unstable when their center of gravity is outside the area of support. For example,...
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What forces are applied to the wall when some thing like a cooler is attached to it? what makes the normal force? [closed]

what force throw to the wall is applied in this situation? what force does this wood is importing to the wall that makes the normal force?
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1answer
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Biomechanics statics of an push-up [closed]

So I am really struggling with a statics problem about calculating forces and torques of an exercise. So I need to calculate the forces acting on the feet and hands, as well as the torques, for 2 ...
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3answers
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How to find the equilibrium point of a system that is bowl shaped and a mass inside the bowl with given potential energy function?

Question: $z=U(x, y)=ax^2+by^2, (a,b \in R^+)$ is the potential energy function of the system. How to find the equilibrium point of this system? We have to find the equilibrium point of this system ...
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Intuition behind First moment of area and link to centroids

I essentially have the same question, however only concerning the First moment, as this user ,however none of the answers satisfy my questions. I understand that we are trying to get a sense of the ...
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1answer
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Forces in statically indeterminate system

I am a bit puzzled about the meaning of statically indeterminate in particular in terms of force distribution. The following system is clearly statically indeterminate: There are four reaction forces ...
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1answer
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Deflection of L bracket [closed]

I want to calculate the deflection for an L bracket like https://imgur.com/a/0PabX0T to determine how thick I will need to make the steel for a workshop shelf. I have done the calculation using the ...
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1answer
56 views

How can I calculate the coordinates of segments that form a hanging chain?

I'm trying to get a chain physics model with segments. I'm feeling rather stupid, but how can I calculate which is the new position of each dot when the chain moves its ends? expressed in another ...
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2answers
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A problem about moment (torque ) [closed]

Everybody knows that moment of a force increases with distance. However, there is a problem about it that makes me confused these days: Let's take a look at this picture due to the formula M = F.d, ...
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How to derive the equation to calculate height of stopper? [closed]

I have a spherical ball of radius r places on an inclined plane of angle θ. What should be the minimum height of the stopper <...
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1answer
59 views

Moment of force about a point definition

In defining the moment of a force about a point as "the tendency of one or more applied forces to rotate an object about an axis [going through a point, hence also about a point]", I see it logical to ...
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1answer
56 views

Leaning ladder problem

Could anyone explain the case of a ladder leaning on a smooth floor and against a rough wall? It's not clear how there is a vertical frictional force at the wall despite having zero normal reaction ...
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1answer
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Physical meaning of internal bending moment

Here's the setup: The textbook, where this is from, first walks through how to find the strain and stress as a function of z, which is fairly straightforward. Then, it calculates the "total internal ...
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1answer
63 views

Questions about potential energy and its corresponding force

The question arises when working at the following problem: A light wire is bent into a right angle and a heavy ball is attached to the bend. The wire is placed onto supports with height difference $...
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1answer
110 views

Is static friction considered to be a conservative force? [closed]

The work done by static friction is 0.So shouldn't it be a conservative force?
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72 views

How to calculate pressure/force on a triangle vertex? [closed]

Assuming those are identical triangles. We add some weights on the upper bar. The only difference is with the location of the weights and the size of the weights. Is there any difference on the ...
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1answer
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Statics Question about Friction on an Incline

So for an object, say a block, on an incline, there hold three cases in which minimum force $P$ is dependent: a.) To start the block moving upwards.This is the case where static friction is at the ...
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Determining the magnitude of the projected component of the force problem [closed]

I can't figure out this homeworm problem. I know the answer is 147 N, but I don't know why. Determine the magnitude of the projected component of the force F = { 450 i - 250 j + 650 k } N acting ...
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1answer
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Why is this force completely vertical?

I have the following system, which is in equilibrium: It's a bar that can pivot around A, and is held in place by a string at B I'm supposed to find the force applied to the bar at the pivot. I ...
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2answers
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A question about the vertical part of the beam

I am solving beam type of problems finding reactions, moments...my question is how do I represent the F2 force that is acting on the vertical part of the beam (on the stick). Usually there is only a ...
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1answer
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Problem in statics in applications in engineering mechanics at coursera

in the first image the instructor neglected the reactions at point d and e while he was drawing an fbd to the whole structure ... Shouldn't we give attention to the reactions at d and e while we are ...
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Why is the triangle the strongest shape? [closed]

I've been doing some research about buildings that sustain earthquakes and then it was mentioned that the triangle (or pyramid if we are talking about 3 dimensional space) is the strongest shape, why ...
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Can someone explain how does the -4222.50kN jump happen in the Shear Force Diagram of the beam [closed]

This the the problem https://beamguru.com/online/beam-calculator/?save=02461c5130daee73a8c73a51060e2adc Now I did the reaction forces correctly $R_a$ and $R_b$ and it matches with the ones the ...
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1answer
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Find the center of mass of the body in the figure [closed]

In the figure below is a very simplified model the mass distribution of the human body shown, with head (mass 5 kg), Torso (28 kg), arms (3.5 kg each), thigh (8 kg each), and lower leg incl. Feet (3.5 ...
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Why does the load cause a moment around the support point in column buckling?

Here is a picture from Wikipedia, a free body diagram used to derive the maximum load in Euler's buckling theory. The moment is calculated around point A. It is claimed that the load $P$ causes a ...
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Static equilibrium in an accelerated frame of reference [closed]

TL;DR : I'm trying to resolve an exercice of static equilibrium in an accelerated frame of reference but I do not have the same answer as the correction for the rotation equilibrium. We have an ...
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6answers
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Why is the normal contact force horizontal on an inclined ladder?

There is only one force acting on the ladder which is its weight and it acts vertically downwards. Then why does the normal contact force from the vertical wall act horizontally on the ladder? There ...
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1answer
64 views

Can there be a moment at a hinge?

I've recently started studying statics and I was told that a hinge cannot offer moment reaction. It offers only reaction forces in x and y directions: But when doing problems I've just encountered ...
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1answer
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Mechanics of Material - Forces in a Vertical I beam

Helllo, I was wondering, If I have an I beam like in the rough sketch attached, is the a bending stress that exists in a plane somewhere along the beam? I am thinking there is not since if the ...
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1answer
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What's the direction of the static friction force in this free body diagram? [closed]

I know that static friction is a force that opposes any force of motion and in this case we have two: the parallel component of weight force, tension force. So the static friction can oppose the ...
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1answer
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A question about forces acting on an object

https://youtu.be/KWAvj8ATXmE at 2:43 , when he is testing the force by lifting a mass, does he experience the weight of the mass on his hand(as friction) or is it the atmospheric pressure force that ...
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Equilibrium in a spoon hanging from a toothpick

While searching about equilibrium I came to this YouTube video which was quite astonishing but the video maker didn't explained the physics behind it. My query is that why the spoons aren't falling? ...
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Bridge mechanics [closed]

The emergency bridge shown in picture above is constructed in the form of a framework with 11 bars. On one bank, the bridge is anchored by the bivalent fixed bearing A and on the opposite bank by the ...
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148 views

Can the law of the lever be derived from only Newton's Three Laws of Motion?

Can the law of the lever be derived from only Newton's Three Laws of Motion?
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Can the equivalent point weight extend beyond the body on which it acts?

If the x location of the centroid equals (moment about O)/(equivalent point weight) and there are forces acting above and below the given body, couldn't the value of the x coordinate potentially ...
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2answers
64 views

Where to put weight so that 2 jointed rods are most likely to slip? [closed]

I'm doing the attached mechanics question for school and would like to know exactly why you the man standing in the middle of the system increases the likelihood of the system slipping. The solution ...
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What is the resultant force acting on a body when two equal and opposite forces act on it? [closed]

I feel I am missing a key intuitive insight into understanding a problem like as follows: (Sorry for rough drawing) The system above consists of a hammer, floor, and a ball in between those two. When ...
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Question in measurement uncertainty calculation in projectile motion

For a projectile motion, $\displaystyle t=\sqrt{\frac{2y_0}{g}}$. If you look at page 6 of the article(http://www.hep.vanderbilt.edu/~maguirc/Physics231/p231_lect3.pdf), the fractional uncertainty/...
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Can we construct a (specially designed) truss that is horizontal when supported from one end?

It is not possible to support a horizontal beam from one end, and the same is true for an I-Beam. I believe this can also be proven for a pipe, but that proof is just outside of my reach. But all of ...
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1answer
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Statics and equilibrium of a rigid body [closed]

A vertical cylindrical container contains within it three identical spheres of equal weight P which are tangent to each other and also to the inner wall of the container. A fourth sphere, identical to ...
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5answers
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Which explodes first? Vacuumed tank or pressurized tank?

We have been arguing with a friend and couldn't agree. Here is the question: We have two systems. In both of the systems, we have an identical sphere tank. In the first system, we are vacuuming the ...
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378 views

Why the weight force is not included in this free-body diagram

Take a look at this question. The solution by the author is My question is why the weight force is ignored in the free-body diagram? Is it because the roller(A) and the pint(B) which cancel the ...
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3answers
118 views

How the ladder will slip if the wall and ground were to be smooth?

If I have a situation like this Where my blue thing is wall and the yellow thing is the ground. If both were to be smooth then they will exert a contact force only normal to them which I have ...
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1answer
26 views

Center of mass of a rotating object

I read that if the left block moves up by $dx$ then the center of mass of the rotating object moves down by a vertical length of $\frac{1}{2}dx\sin(\phi)$ but I thought it would move down by $dx\sin(\...

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