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This tag is for the classical concept of forces, i.e. the quantities causing an acceleration of a body. It expands to the strong/electroweak force only insofar as they act comparable to ‘classical’ forces. Use [tag:particle-physics] for decay channels due to forces and [tag:newtonian-mechanics] or one of the other subtopics of [tag:classical-mechanics] for the dynamics of classical systems.

When two forces in opposite directions are equal, there is no acceleration. That doesn't mean that there is no movement. It simply means that there is no change in velocity. …
answered May 6 '18 by probably_someone
In order to predict which side an object will land on, generally we need a few pieces of information: The shape of the object and its size. This determines how many "sides" the object has in the fir …
answered Jan 7 by probably_someone
Both the expression for electric field and the expression for capacitance used in the references assumes that the electric field between the two plates is uniform. This is only true if the plates are …
answered Aug 29 '18 by probably_someone
The force doesn't actually instantly change the object's direction. The object follows a curved path under the influence of the force, and then continues in a straight (diagonal) path once the force i …
answered Jul 24 '17 by probably_someone
We have a potential $V=-\frac{1}{2}||\vec{w}\times\vec{r}||^2=-\frac{1}{2}w^2r^2\sin^2\theta_{wr}$, where we have used only the definition of the cross product, and where $\theta_{wr}$ is the angle be …
answered Sep 22 '18 by probably_someone
There's no reason to believe that there should only be four. Four is the highest number of fundamental interactions that we've seen so far, but there may be other, extremely weak* forces that we … simply haven't observed yet. There are plenty of experimentalists working on looking for new macroscopic fundamental forces even today; in fact, as an undergrad I spent most of my research doing exactly …
answered May 25 '18 by probably_someone
Newton's Third Law, as it is most commonly worded, reads: Every action has an equal and opposite reaction. Note that there is nothing in this statement about the action and reaction forces … pair of forces that a pair of interacting objects (sometimes called an "action-reaction pair") exert on each other. A force is defined as an interaction in which momentum is transferred over time from …
answered Nov 27 '18 by probably_someone
change the momentum of one object, then another object's momentum must change in the opposite direction to preserve the total momentum. Forces cause changes in momentum, so every force must have an …
answered Jul 25 '17 by probably_someone
constructed of a lattice of atoms bound together with attractive electromagnetic forces that generally keep their spacing when forces are applied.* At the boundary between the two objects, the electron … object, which means, microscopically, that their lattices are in some way joined together into one large lattice, that again, wants to keep its spacing intact when forces are applied.* Now, when one …
answered Jun 18 '17 by probably_someone
space); specifically, it's a scalar that is derived from a more complicated object called the stress tensor which contains information about the forces at every point in space in a material. Since forces … are vectors, and forces are the inputs for the stress tensor which eventually gives rise to the pressure, one might be able to say that pressure is derived from vector quantities, which is basically …
answered Aug 30 '18 by probably_someone
to external forces. Then the net external force on the car-truck system is equal to the mass of the system times the acceleration of the system. In the following analysis, I'm assuming that there is … truck. In this case, the only external forces are: The weight of the car $mg$, The weight of the truck $2mg$, The normal force exerted by the ground on the car $N_c$, The normal force exerted by …
answered May 21 '18 by probably_someone
If you were to take a block of sandpaper and rub it around in a full circle on a table, the block would afterwards be in the same position as if it had not moved at all. Hence, its displacement is zer …
answered Nov 29 '18 by probably_someone
than this, the ball would not have moved. Forces are the cause of acceleration, not motion. Remember Newton's First Law: in an inertial frame, an object not acted on by forces will continue to move … conservative force. In general, the potential energy is the energy contained in the configuration of a system. What "configuration" means can differ for different forces; in the particular case of the …
answered Jan 29 by probably_someone
You are correct that a constant force $F$ applied to an object of mass $m$ will generate an increasing amount of power as the object accelerates. This extra power doesn't "come from" anywhere physical …
answered Jul 9 '17 by probably_someone
Letting $k=\rho C_D A/2$, and letting $m=m_0 - bt$ for constant $b$, we have $a=\frac {dv}{dt}=\frac {kv^2}{m_0-bt}$. This is a first-order ODE in $v$, with solution $v=\frac {b}{k\log (m_0-bt)-C} …
answered Jun 15 '17 by probably_someone

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