**4.342 forces questions.**

Im curious what solving a statics problem of a hanging white board can tell me. My whiteboard recently fell because the sticky hook peeled off the wall.
By finding the tension forces in the string ...

Consider the following case of a drum unrolling a mass that is on a massless string wrapped around the drum:
According to my professor, here we must consider the mass $m$ being in a gravitational ...

When you try to put two electrons or neutrons close together (e.g. in a white dwarf or a neutron star), these spin-$\frac{1}{2}$ particles, by the Fermi principle, tend to push each other apart.
For ...

I want to know how a body moves on a circular track.
Suppose a car enters a circular path.
If I don't turn my steering wheel, then the car would travel in straight line and perpendicular to the radius ...

At my gym, some of the weight machines provide a double mechanical advantage using a gun tackle pulley configuration.
For a long time when I was using such machines, I convinced myself that if I were ...

If we exclude the motion due to the rotation of the Earth, what are the forces acting on the book? I know about the force of mg acting on the book and its opposite acting on the Earth, but I have some ...

As I was trying to find an answer to another problem, I was informed that the equation I was using would not work.
The equation I was using was
$$F = (NI)^2\mu_0\frac{\text{Area}}{2g^2}$$
If this ...

I understand that people explain (in layman's terms at least) that the presence of mass "warps" space-time geometry, and this causes gravity. I have also of course heard the analogy of a blanket or ...

Is magnetic field conservative in nature?
Magnetic field lines do go in closed paths but that's not the definition of conservative.
Rather, a field is conservative when the force on a test particle ...

How do I find out the tensions $T_1$, $T_2$, $T_3$, and $T_4$ in the arrangement in which two blocks of 1 kg and 2 kg are hanging through a rope which is making an angle of 45 degree and 60 degree ...

Varignon's theorem states that "If many coplanar forces are acting on a body, then the algebraic sum of torques of all the forces about a point in the plane of the forces is equal to the torque of ...

A block of mass $m$ is placed on an inclined plane (a ramp). If a constant force $f$ is applied to the ramp so that it is accelerating horizontally at a proper rate, the block will remain at the same ...

I saw this mind boggling result that if the tires don't slip then the work done by an engine to move a car is zero. Why is this true? Moreover, what does this truly mean?
Update: Sorry about not ...

Consider a massless, frictionless piston fit into an airtight container containing an ideal gas. And let us say that the gas undergoes quasi-static isothermal expansion by lowering the pressure ...

I have a force $$\vec{F}=x^2 z \hat{i}+3y^3 \hat{j} +xz \hat{k}$$
which can readily be seen to be non-conservative.
I want to compute the work done moving a particle of unit mass from point $(1,0,\...

So, I'm having a friendly disagreement wherein someone and I are theorizing about the lethality of a vaporized bullet.
I'm under the impression that if a bullet is vaporized, mid-flight, the ...

I have stumbled across these and have taken some interest. Are the meanings of generalized "force" and "potential" the analogous to the case of mechanics where the derivative of one with respect to a ...

bear with me, but i would like a definite answer, now, starting off the external charge density on the outer surface of sphere WILL be uniform by unique solution of Laplace equation and letting the ...

I am thinking of an approach to physics in which physics is built without a concept of force, that is, an approach that explains motion inside a framework of physics in such a way that it is done ...

Assume I have a system 4000 lbs with 4 casters. The static coefficient of friction is 0.7 to the floor. Do I need to provide 2800 lbs as initial pushing force in order to make the system to roll? (...

It is known classical mechanics doesn't works to describe atoms mechanics. I'm studying Coulomb's law, i.e:
$$F=\frac{k\,q_1q_2}{r_{12}{^2}}$$
that all of you know. I wonder if it is possible to ...

I am working on the dynamics of a membrane under various forces. My membrane is made up of discrete points $(x_i,y_i)$ with $i = 1,2,\cdots n$. I can model the total energy of the membrane as made up ...

Ok! This kid was riding his brand new bicycle in the park. I asked the kid let me take the bicycle for of wheelie round around the park. He agreed hesitatingly. :P
I did some wheelies 1 pedal ...

I have two PCBs (printed circuit board), and they are glued by adhesives, as show in the pictures. And the location of the adhesives are indicated on the picture (please notice that NO adhesive is ...

An unloaded bus of mass $m$ and a loaded bus of mass $2m$ are having same kinetic energy. Brakes are applied to both, so as to exert equal retarding force. They covered $x_1$ and $x_2$ as distance ...

When a person lifts a book while standing on the earth's surface. Why is his force considered external to the book-earth system? Isn't his force internal like the case of the forces that cause the ...

Assume a pulley and a massless rope. On one end there is a $10.0$ kg mass. On the other there is a $34.5$ kg mass. What is the acceleration of the $34.5$ kg mass?
I created a free-body diagram with $...

I know that mass affects weight, and weight is a force, and $F = ma$. So how does mass affect speed?

I have learned that
$$\mathbf{F} = m \mathbf{a}$$
where both the force $\mathbf{F}$ and acceleration $\mathbf{a}$ are vectors. This makes sense, since both force and acceleration have a direction.
On ...

The electromagnetic force on a charge $e$ is
$$F=e(E+v\times B),$$
the Lorentz force. But, is this a separate assumption added to the full Maxwell's equations? (the result of some empirical ...

I'm taking what is usually called "freshman's" mechanics course, and I'm basically trying to understand how forces are measured and determined. Starting with the definition of the procedure for ...

Consider the case a rod with hinge on one end in horizontal position. At the instant when it is released, the weight of the rod is going to give it a torque with an acceleration. Why is angular ...

I know similar questions have been asked already but I've been struggling on this for ages so I have come for help.
A hemispherical bowl of radius $r$ is fixed with its rim horizontal. A bead B of ...

In tug of war,
The maximum force that a person can exert on the rope depends on the static coefficient of friction.
Is that correct?

If the dot product gives only magnitude, then how can it be negative?
For example, in this calculation:
$$W = \vec{F}\cdot\vec{r} = Fr\cos\theta = (12\ \mathrm{N})(2.0\ \mathrm{m})(\cos 180^\circ) = ...

Imagine water striking a water wheel. We can find the torque applied by calculating the force of the water and multiplying by the distance from the center.
To calculate force, we can use the formula ...

So I came across this picture on facebook
My logic says it should show 200N, because you are pulling it with 100N on each side. On the other hand (as one of the facebook comments also stated, also ...

We know that the frictional force always opposes the relative motion. Recently, I happened to read somewhere that "It is the frictional force which causes a car to accelerate on road". My question is
...

I was doing some reading on Absolute hot and was wondering what this actually means:
...

I only know few things about waves, but this question just popped up in my mind.
I already know that particles transfer energy to each other,but I do not know HOW they do it!
The truth is that I ...

POTUS was talking about a Space force and people laughed. Not me, it is his desire to rid the world of nukes and make the world a safer place. He would also like to be able to take out the bad ...

I am interested in making a simplified model that represents only the effect that the moon has on Earths tides.
In this model I am going to assume that the earth is completely spherical (with no ...

Suppose we have a two-particle system with particle 1 and particle 2 that obeys Newton's laws. Further assume that the force on particle 1 due to particle 2, $F_{1, 2}$, is conservative. I know then ...

Why should string apply a force on pulley? (like atwood machine cases) and does that mean the pulley will exert an equal force on string (newton's third law)?
Please explain in detail,if possible ...

Let's suppose I have a ring of mass m, and radii r, thickness t, and width w, as shown:
I would like to come up with a way to be able to work out the highest RPM a ring can reach given m, r, t and w, ...

Is there any generic prescription to separate the set of applied forces to the set of forces of constraint with respect to any arbitrary physical system?

I have a rigid body where multiple forces (green) of different magnitude are applied. If I sum up the parallel component of the forces and divide it by the surface area, I can get the average shear ...

I read this example of pushing a table with your hands. So the force is applied on the table to push and the table exerts the same amount of force on our hands.
My question is, if the forces are ...

I can't for the life of me find a way to solve this.
Given is the length of a T girder, which is fixed at one and on rolled support on the other side
Now in the exercises given during class there ...

- newtonian-mechanics
- homework-and-exercises
- free-body-diagram
- friction
- classical-mechanics
- work
- newtonian-gravity
- acceleration
- electromagnetism
- gravity
- energy
- torque
- momentum
- vectors
- potential-energy
- mass
- rotational-dynamics
- statics
- pressure
- string
- kinematics
- reference-frames
- spring
- fluid-dynamics
- collision

- Why didnâ€™t the Spacecraft used for the Apollo 11 mission melt in the Earthâ€™s Atmosphere?
- Unable to charge HP NoteBook 840 G4 laptop while being overseas
- Why is cross chaining 'bad', but 1x is OK?
- What do MAD and SAD mean?
- I can be "educational" (Depending on your opinion)
- Why do airliners have to park so accurately?
- Listing a Stack Overflow user as co-author for having provided substantial programming support
- How to Write an Eldritch Abomination?
- How do I communicate to my players that a door is, for the time being, absolutely locked to them?
- Why were floppy disks invented after hard disks?
- Immersions of the hyperbolic plane
- How do I draw a box with holes?
- PWM, PAM, PCM sine generation and usage confusion
- \text vs \scalebox
- How to ask my employer if a training course I took a while back has a clause attached to it ("stay at x employer for n months")?
- A name for the sound of liquid discharging from a bottle into a glass
- Does a point charge inside a conducting shell cause redistribution of charge in the shell?
- Upgrading core protocol version (docker quickstart, standalone)
- How to print multiline variables in columns (bash)?
- Search for special characters using grep
- Why did I have to wave my hand in front of my ID card?
- Short story about free will and a device which buzzes/lights up moments before you press it
- Does EU freedom of speech allow a license plate that taunts a political party?
- what is the right time for harvesting broccoli?