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2answers
65 views

How much of an object's mass behaves as if it is located at the center of gravity? [closed]

We recently finished up a physics lab where a 200g weight was balanced at the end of a ruler on a fulcrum (measuring torque). In the analysis portion of the lab, we are asked: "How much of the mass ...
0
votes
0answers
246 views

What are the factors affecting torque (in normal cases)?

I know that force and perpendicular displacement are the factors. I want to know the factors like mass of the body and how and why is the force not distributed throughout the body uniformly. ...
5
votes
3answers
2k views

Why is torque sometimes reported in kg m, instead of the usual N m?

On various websites I see torque expressed as $\rm kg\: m$, but I was always thought that torque is $\rm N\:m$ or $\rm kg\: m^2/s^2$. These are clearly not the same, so why are they called the same, ...
1
vote
2answers
39 views

Can anyone explain me how do I calculate torque?

For my gate automation project, I estimated the amount of force required (in order to estimate the torque) to pull my gate with a spring balance. The display on the spring balance read $2 \text{ kg}$. ...
1
vote
2answers
169 views

How to calculate the weight of a TV, mounted on a different type of brackets and positioned at different swirling angles? [closed]

The problem: So basically I want to calculate the weight/pressure of TV that I want to mount on my wall so I can on my own later on find the right anchors, right fittings, and TBH I am interested in ...
2
votes
3answers
121 views

Why do vehicles with a higher center of mass roll more easily considering that they have a higher moment of inertia?

It is a well known fact that cars with a higher center of mass roll over more easily, but why is this true considering that higher center of mass = higher moment of inertia? I understand that the ...
0
votes
2answers
54 views

Centre of Mass and Reference Point

When calculating the centre of mass for a small body compared to the earth, the equation $$\vec r_c = \frac {\sum_i m_i \vec r_i} {\sum_i m_i}$$ is used, where $\vec r_c$ is the position vector for ...
1
vote
0answers
22 views

Static Equilibrium: cable sag considering equal pulling forces on extremities

When considering a cable with a non-negligible mass and an equal force pulling the cable at both extremities, how can one compute the mid-span sag or a sag function whilst accounting for this pulling ...
4
votes
2answers
81 views

Would a force not cause acceleration $a=\frac{F}{m}$ if part of it is used to cause rotation?

Let's say we have a massless rod of length $2\,\mathrm{m}$ that has a $1\, \mathrm{kg}$ ball at one end and another $1\,\mathrm{kg}$ ball at the other end.$$ \begin{array}{c} {\displaystyle{~\large{{\...
1
vote
1answer
287 views

Angular velocity - Gyroscope

I am currently researching the gyroscope on my own and i came across the concept of angular velocity. The torque ($T$) on a gyroscope is caused by $R\cdot F$, where the force i consider it to be ...
1
vote
0answers
95 views

Determining the mass of my car via m = F/a

I'd like to do something unconventional. I'd like to weigh my car by hitting the gas. I have an accelerometer in my phone (a). I'm trying to determine the force the car is exerting (against the road, ...
0
votes
1answer
520 views

How does center of mass correlate to stability?

"If an object is tilted it will topple over if a vertical line from its centre of gravity falls outside its base" http://www.schoolphysics.co.uk/age11-14/Mechanics/Statics/text/Stability_/index.html ...
2
votes
3answers
476 views

why does unhinged body rotate about centre of mass when off-centre force is applied? [duplicate]

Any force applied to a body creates a torque around some reference point, but if we ignore all other forces (gravity etc.) the body will rotate if and only if the torque is not zero relative to the ...
0
votes
1answer
375 views

Finding the force exerted by a mass at different contact points

Okay so I've been doing a math assignment on torque which has to have real-world applications so I've gone off on a massive tangent trying to incorporate physics principles and trying to get them as ...
0
votes
3answers
3k views

Angular equilibrium on a see-saw

I have a tonne of questions related to see-saw equilibrium because most places I've been to online only deal with horizontal equilibrium - but static equilibrium can occur on an angle too. My ...
1
vote
2answers
3k views

Connection between moment/torque and centre of gravity?

So I understand how moments work with regards to basic examples like pushing a door, in that the further you are away from the hinges of the door, the greater the moment, which is like a turning force....
0
votes
2answers
222 views

Why can't I calculate center of mass via torque? Results off by a few percent

Why do I keep getting a slightly different result from the following two ways of determining the center of mass of a rigid, geometrically simple object? The object is a rectangular 5(x) by 7(y) ...
28
votes
8answers
7k views

Why is there a size limitation on animals?

Why is there a size limitation on human/animal growth? Assuming the technology exists for man to grow to 200 feet high, it's pretty much a given that the stress on the skeletal structure and joints ...
1
vote
1answer
2k views

Does mass concentration affect the torque induced by a force?

If you had two bodies with the same weight but one having mass concentrated more in the center, while the other had most mass concentrated on the outside, but both had the same center of mass and ...
1
vote
1answer
248 views

Stability of balanced masses with different surface areas

Say I have this setup. The two round objects have equal mass and their centers of gravity at the same distance from the shaft. The objects only differ in that they have different surface areas (assume ...