Questions tagged [statics]

Statics is branch of engineering concerned with the analysis of forces and moments on physical systems in static equilibrium.

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284 views

Inertia relief in ANSYS - rotating model

I'm trying to use ANSYS to solve statically a dynamic problem. As shown in the image below, there is an orange bar that is constraint to slide horizontally only and attached to another bar (pink) ...
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2answers
827 views

Statics Question

I have shared the question statement, its diagram and my solution but my solution is wrong and I have no idea why is it wrong, please help me out.
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0answers
185 views

statics exam question about friction

In a statics exam I had the question in the picture attacehd and I had some trouble understanding it. The question is so Under the effect of torque Mo rotates a wheel (radius r) with constant ...
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1answer
238 views

I'm taking statics, and I'm stuck on this truss problem, how do do I solve this?

I'm an engineering student, our professor assigned us this truss problem I found $A_y$ and $L_y$ by using the moment about l, and found ab, now what? It seems like I have too many unknowns to solve ...
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3answers
273 views

Statics problem ignoring horizontal reactions seems to require horizontal forces

I'm an industrial engineering student taking engineering mechanics, and I'm quite confused by this problem our proffessor gave us, the chair is supposely in equilibrium, yet in order to counter the ...
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1answer
73 views

Which container orientation, if any, can hold more weight?

These are cross sections of identical shipping containers, except one is rotated 45 degrees. The cross sections are squares, 3 meters to a side. I drew dashed lines to show where they're suspended by ...
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1answer
483 views

Statics problem: Finding resultant force angle measured counterclockwise from positive x-axis

I have this diagram: And I have done these calculations: $$\begin{align} R_x&=-20\sin(30)+30\cos(35)+80\cos(45)=71.14\text{ lb} \\ R_y&=20\cos(30)+30\sin(35)-80\sin(45)=-22.04\text{ lb} \end{...
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1answer
61 views

Stress analysis for the same configuration but different material

The same geometry and the same free body diagram. However, if we replace the material from steel to glass, for example. How does that influence the analysis? Two things I think are 1. steel is ...
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0answers
170 views

Can a propeller be used as a balancer by spinning it perpendicular to ground?

This is a unique idea of mine. In the above image, the torque reaction propeller is rotating clockwise producing a side-thrust of 40N. With its reaction torque alone, it has to balance the moment ...
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1answer
27 views

Estimating planar mass distribution

I have a planar object whose center of mass is not at the geometric centroid, and I want to roughly estimate the magnitude of four hypothetical point masses that at the four corners that would result ...
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1answer
806 views

Bending equation and max deflection of UDL and multiple point loads

I have a beam, simply supported with 2 points loads and 2 UDLs. The loads are symmetric about the centre of the beam. I've tried to derive an expression for the moment along the beam and then via 2 ...
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2answers
268 views

Solar Array Frame Design / Statics Design Problem

I need some help with a statics design problem. I am tasked with designing a solar panel frame to mount on a building and am the only engineer on staff so I don't have anyone else to ask the simple ...
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1answer
158 views

Calculating force exerted on plate by link

I am currently involved with a project using a mechanism similar to that seen in 'table tilters' and we are struggling to work out how to begin resolving the forces. The image shows the state we are ...
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1answer
2k views

Linear actuator on a scissor lifting table

I am designing a scissor lifting table and I have an issue with the linear actuator. This table should be lifting 100 kg. I studied the problem in two ways : a static study and a power study. My ...
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1answer
296 views

Timoshenko Beam Theory for Quasistatic Cantilever Beam: Shear Term

I'm trying to determine the effect of shearing force on the deflection of a quasistatic cantilever beam. In his book, Theory of Elasticity, Timoshenko added the following term to the deflection: $$\...
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5answers
2k views

Do flexible water hose cause pressure drop with constant flow?

My dad has a tub by a lake. He has a water pump in the lake to pump up water into a tub. He claims that if he use a flexible hose, the pressure in the hose at the top will be lower than if he use a ...
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0answers
88 views

Determining the load on a pump vibration isolator

It seems to me that pump vibration isolators need to support: The weight of the pump The weight of the water in the pump The weight of the water (only) in the drop to the pump The supplier of ...
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2answers
2k views

How would I find the Second Moment of Area of a Parallelogram?

How would I find the second moment of area of a parallelogram, as shown?
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2answers
702 views

What is the distance at which the triangular UDL is acting on in this problem?

I'm working on the statics problem below: I'm tasked to draw the shear and bending moment diagram for the frame. I'm trying to work out the reactions and I'm taking the moment about pin E.Here's my ...
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1answer
199 views

How to draw a shear force diagram when two forces are acting at the same point

I am working on this question on my statics assignment: Approximately at point B there are two forces, 20kN and 50kN.So far, I have only calculated global equilibrium and got the following values: $...
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2answers
623 views

How can I determine horizontal force reactions in a fixed on both ends beam [closed]

How can I determine horizontal force reactions in a fixed on both ends beam like this one?
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2answers
355 views

Does a washer really increase static friction force?

Suppose I have a bolt that goes through a hole in a plate and is under tension. If I place a washer between the bolt head and the plate, does static frictional force (torque actually) really double? I'...
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Shift of joint in kinematically indeterminate system

Given ist the following system: $$EI=100000\frac{\text{kN}}{\text{m}^2}$$ $$EA\to \infty$$ I'm suppossed to find the horizontal and vertical shift of joint g. My first approach was to use the ...
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1answer
132 views

Skewing of joints using virtual work

Given ist the following framework: $$E=210 \frac{\text{kN}}{\text{mm}^2}$$ $$ EA \to \infty $$ $$ I_1 = 80000\text{cm}^4 $$ $$ \frac{I_1}{I_2} = \frac{3}{4} $$ $$ I_3=I_1 $$ Using the principle of ...
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189 views

Engineering mechanics(statics) [closed]

I don’t get how to get the answer to part e. Should we assume reactions at A and B in all three figures are same? If so, why?
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8k views

Shear Force Diagram of a Simply Supported Beam with triangular load distribution

I've been attempting this fundamental shear force diagram problem for several days, but can't seem to get the correct result. I'm trying to calculate the shear force diagram in terms of $x$, but I'm ...
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2answers
2k views

How can I calculate the buoyant force on an object without knowing in advance the amount of water displaced?

Suppose I know the mass and volume of an object, as well as its exact shape and density distribution as a function of space (x,y,z). Without submerging it to determine the amount of water displaced, ...
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3answers
1k views

Calculating moment of inertia for a hollow discontinuous circle?

This is a pretty simple problem, but I'm just not sure how to go about it. I want to find the moment of inertia of a discontinuous hollow circle. But since the shape is so irregular, I'm not sure how ...
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2answers
118 views

Design of multiple wood layers

I am currently working on designing a teeterboard for the circus (a seesaw that people jump up and down on the ends), and need some advice on my methodology for wood selection. The primary wood will ...
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2answers
852 views

How does the number of braces in a balsa wood tower affect the load capacity?

I am deciding between two design ideas for a project in which I have to build a balsa wood tower that can maximize load weight and minimize structural weight (maximize efficiency). I've included a ...
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2answers
67 views

Beam question to find the maximum stress

I tried the question but I didn’t get the correct answer, can anyone tell me what mistake I made? $$\begin{align} I &= \int y^2\text{d}A \\ &= 25^2\cdot10^{-6}\cdot200\cdot50\cdot10^{-6} \\ &...
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1answer
298 views

Beams question help [closed]

I tried to solve this question I arrived at this diagram but taking the moments about the center of the beam I arrived at x=L/2. Can someone tell me what I need to do to get the correct answer?
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86 views

What are the reactions at the supports? [closed]

Suppose that you have a bar of length 2 meters. This bar is along the x-axis. At x=0 there is a pin support. Also, at x=1 meter there is a pin support. A forceof magnitude 50Newtons is applied along ...
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1answer
49 views

How to apply static failure criteria for bending stress in an angled cylindrical surface?

Let’s say I have an irregularly shaped bearing with a cross section that looks like the angled surface of a conical frustum, shown below. If a bending moment is applied which causes the inside ...
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1answer
210 views

Failure due to shear stress on rod lip?

Let’s say I have a circular rod that has an outside lip with a larger diameter and certain height. The rod moves axially, and the intent of the lip is to mechanically stop the rod at a maximum axial ...
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1answer
482 views

How to deal with inverse distributed load ramp starts and ends somewhere along the beam?

I know how to solve it by moment line methode but i want to use singularity function here and i'm very confused. My strategy consist of writing the correspond singularity function for each element but ...
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3answers
2k views

is bending moment on roller supports at beams zero?

isn't the bending moment supposed to be zero on roller supports at beams? then why isn't it zero here in this picture at x=2?
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69 views

How to design a shelving unit out of McMaster Carr Struts? [closed]

I apologize for the complete beginner question. I'm an Undergraduate Research Assistant trying to design a shelving 8'tall by 10' Long, 4' wide shelving unit to support about 200 lbs. I'm designing ...
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3answers
858 views

Second Moment of Area for slanted triangle?

Consider this triangle with its centroid at $C$: Then this is how I believe we can calculate the Second Moment of Area along the $x_{C}$ and $y_{C}$ axis: $$\begin{align} I_{xc} &= \frac{bh^3}{...
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5answers
422 views

Height limits of brick and mortar tower?

What are the factors limiting the height of a "tower" made of typical fired brick and mortar? By "tower", I mean a structure whos point is to be tall, and can support a human standing on or near its ...
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3answers
279 views

Difference in shear stress - one bolt vs two

So i have a little diagram to visualize: So lets say i have a 20 mm plate connected with two M8 bolts, and i apply a 30kN force in the direction shown in picture. Question is - would the force be ...
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1answer
153 views

3D construction [closed]

Can someone please tell you what to start with to construct a Kids Bike Trailer as 3D. It should select material and geometry. I think I should start sketching with forces (children's weight) and ...
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1answer
2k views

What is the advantage of statically indeterminate structures?

Most of the real life structures are statically indeterminate. What is the benefit of designing a statically indeterminate structure instead of a statically determinate one? I don't mean only beams ...
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1answer
55 views

Included angle in a semicircle

I'm solving this problem in mechanics, Two cylinders A and B, weighing 100 lb and 200 lb respectively, are connected by a rigid rod curved parallel to the smooth cylindrical surface shown in Fig. P-...
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1answer
704 views

For a bridge/beam, how will the Young's modulus affect the susceptibility of it buckling? [closed]

I originally thought that a higher Young's modulus would increase susceptibility, but now I'm thinking it might be independent.
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266 views

Maximum slope of the road for a car pulling a trailer

I have a five meter long, 2.40 meter wide, 200 kg portable catamaran I've built at home. To transport, I bought a semi-finished trailer, just the running chassis; and built the upper structure, namely ...
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3answers
1k views

Why does the minimum force have to be parallel to the incline?

If we have an object on a frictionless inclined bench, why does the minimum force applied to keep it steady have to be parallel to the incline (or perpendicular to the reaction force)? In other words,...
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2answers
9k views

how to solve internal hinge problem with loading given on hinge [closed]

how to solve internal hinge problem with loading given on hinge
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1answer
2k views

Why are the support reactions of the two pin-connected members different?

Can someone please explain why the support at C does not have a vertical reaction force while the support at E has? Doesn't the support at C have the same kind of pin connection as the support at E?
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90 views

Dimension of the unidirectional mechanical clutch

This is a problem from the book Engineering Mechanics Statics vol-1 by Meriam Kraige. The elements of a unidirectional mechanical clutch are shown in the figure.A torque $M$ applied to the outer ring ...