# 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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### Calculate the second moment of area around y-axis [closed]

In an exercise in my engineering class, I have to calculate the moment of area around y-axis (the horizontal one). There is a very small (negligible) gap at the middle of the semi-circular arc and the ...
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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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### 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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### 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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### 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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### 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?

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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### 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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### 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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### 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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### 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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### Magnitude of F about line CD (Mechanics, 3D vector system)

I am having trouble with this question: I will write out the question below to make it easier for other people googling the question to find it: 2/139 If the magnitude of the moment of F about line ...