# 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 weight needed to balance a beam

I have found many sources to determine the weight or force needed for a balance moment, but not one that included the weight of the beam as a variable. I assume this is a very simple equation. Please ...
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### How is this system in equilibrium? [closed]

So, after mathematically calculating the answer I found it to be zero. But my teacher says I don't have to do the calculation as this system is in equilibrium and the initial acceleration is zero. But ...
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### Two sliding blocks and friction [closed]

I was doing a practice problem in prepping for a midterm and then numbers that I got just seem implausible. I know that they are the 'right' answers, I'm just not sure if this situation could exist in ...
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### Static analysis of rigid bodies in 3D [closed]

How to calculate torque due to gravity of a 3D linkage mechanism? I am performing a static analysis of a Baxter Robot arm. How to calculate the torques at each of the joints ?
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### Can this really happen?

I saw an interesting image , would it fall down or stay in stationary?
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### Why exactly is the pressure an object experiences at a given depth in a fluid?

I am currently trying to work through why an object with smaller density than the fluid it is in floats upwards. I know that the object experiences pressure in all directions because it has moved ...
190 views

### Which way will the scale tip? [duplicate]

This problem has bothered me for quite some time and I can't solve it. I have even tried to make a construction, but it sometimes tips to the left and sometimes tips to the right :). When we submerge ...
274 views

### How does torque work?

Why can we assume the the net torque is equal to zero when we pick one of the points as the axis of rotation. For example if we selected the left leg of the table for the axis of rotation why can we ...
170 views

### Counting experiment and standard error

I have a counting experiment: Let's say I have N identical bees. I take one of them, expose it to $\gamma$-radiation and look if it has died or survives. If it survives, I count it as 1 count. If it ...
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### How to calculate the maximal weight that a cable can support? [closed]

Exercise: Exercise from Theory and Problems of Physics for Engineering and Science. In the crane here the boom is $3.2 \text{m}$ long and weighs $1200 \text{N}$. The cable can support a tension of ...
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### How to consider another Cartesian axis?

Well, I solved the problem. The point is that I used a x and y axis with x parallel to the inclination of the box, but I wanted to think differently, if one considers the y axis itself containing the ...
412 views

### Basic Static Equilibrium of a rigid body

I'm trying to understand static equilibrium in 3-dimensions, but I feel like I should understand it in 2-dimensions first let's assume we have a rock with inhomogeneous density (black rectangle) with ...
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### Under what condition would I fall off a cantilever chair? [closed]

So this question is nagging at me and after many rounds of searching I still can't figure it out. I want to know is how load is distributed through a cantilever chair. Under what circumstances would a ...
8k views

### Hanging a hammer from a table and a stick so that its midpoint is outside of the support of the table

I came across this pic on the internet today. At beginning I thought it is just not possible because the centre of mass is way off so gravity will generate torque making the stick and hammer fall. ...
492 views

### How to make a free body diagram of a lever?

So this is what we are working with: Basically, the spring and the lever are used to press in the plug (part no 2). I need to find the force that is acting upon the welding (I painted it in red). Now ...
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### Why is skidding considered kinetic friction when braking on a car?

So according to my textbook applying the brakes hardly to essentially lock up the wheels causes skidding which is kinetic friction so the breaking distance is longer. However, if the brakes were "...
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### What is the difference between Quasi static and Dynamic simulation?

I'm a newbie in Physics, I read some papers in bio-mechanical that model human joint motion, some of them are modeled using Dynamic, while others using Quasi static. All I know so far is that in Quasi ...
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### Finding normal reaction [closed]

In the given figure, find the normal reaction applied by surface OB and OC on spherical mass m = 10 kg as shown
Okay so I have this weird problem in my statics book that wouldn't come to a solution no matter what I tried. It states the following: A body of weight $4$ kg.wt is placed on a horizontal rough ...