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Results tagged with forces
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user 204834
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 the [particle-physics] tag for decay channels due to forces and [newtonian-mechanics] or one of the other subtopics of [classical-mechanics] for the dynamics of classical systems.
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Why isn't force $\vec{F}=m \vec{v}$ instead of $\vec{F}=m \vec{a}$?
Both quantities, $m \vec a$ and $m \vec v$, are important quantities in physics. In general, important quantities get names, so it is not surprising that both of these quantities should be named: forc …
- 103k
0
votes
Two People Pushing Off of Eachother, Newton's Third Law, and Unbalanced Force
Say the person on the left pushes with 100 N and the person on the right pushes with 70N. What happens to this system?
This is not possible. They can only push on each other with the same force. …
- 103k
1
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Conundrums on energy and graph
W = fdcos(theta). And clearly, there must be a force enacted to change the velocity of the object. Assume there is a distance present over which the force acts. Now, the work should be negative as …
- 103k
2
votes
Is force frame dependent?
Note: this answer is based on Newtonian mechanics not special or general relativity.
If we start in an inertial frame and consider a particle acted on by a real force in the $x$ direction then the m …
- 103k
2
votes
Accepted
Centripetal force disappearing when switching between inertial frames
from this we can write centripetal acceleration as:
$$ \ddot{r_c} = \frac{| \hat{j}|^2}{ |\vec{r}|}$$
by the formula:
$$ \vec{\ddot{r_c} } = \frac{|\vec{\dot{r} }|^2}{|\vec{r}|^2}$$
These formulas a …
- 103k
1
vote
Accepted
Forces with metric and imperial values
So if you are measuring forces in pounds and masses in slugs then you will see $g$ in all of the same places that you see $g$ using SI units. … But if you are measuring forces in pounds (force) and masses in pounds (mass) then the factors of $g$ are absorbed into the units. …
- 103k
0
votes
Is there an action reaction pair of forces when an object accelerates due to a pull/push?
if I am to pull on a crate and it doesn't move then I know that there is an action reaction pair of forces where the pull from me is resisted by friction
This is not an example of an action reaction …
- 103k
24
votes
How do forces 'know' they need to move when a system is in motion?
Forces are not considered to move in the sense you describe. Basically, a force is not like energy. … Newton’s laws describe how forces act in general. …
- 103k
1
vote
Accepted
Doubt on local distinguishability of non-inertial frames
it's also possible some internal mechanism (e.g. magnetic force) of the room is causing that movement in the acclerometer
This point is incorrect. There are many different mechanisms and designs of …
- 103k
2
votes
Accepted
Why do I feel centrifugal force If I move with constant speed on a turn?
Acceleration is the change in velocity $$\frac{d\vec v}{dt}$$. Importantly $\vec v$ is a vector, meaning that it has both magnitude and direction. So changing the direction of your velocity vector is …
- 103k
1
vote
Why do forces cause objects to move (assuming there is an unbalanced force)?
Thus, forces give acceleration. …
- 103k
2
votes
Why direction of stress is not pointing in opposite to that of external applied force?
Now, at a given point in the object you can look at forces on areas pointing in any direction, but it is sufficient to consider the forces on the six faces of an infinitesimal cube. …
- 103k
29
votes
Are Newtonian forces real forces or just a useful construct?
But if you consider two objects of different weights on the same table, then the table applies 2 different normal forces to the 2 objects. This really seems to be an abstract construct. … Or at least nothing more abstract than the other forces you mentioned as being acceptable.
Consider that the surface of the table is covered in many small springs. …
- 103k
1
vote
Accepted
Why is the force on a rigid pendulum directed radially?
What is the difference between this case and the pendulum? What condition allows us to assume that the force from the rod is radial for the pendulum?
The condition that explains both results is that …
- 103k
3
votes
Accepted
Are Newton's first and third laws contradictory?
They are not contradictory. Contradictory would mean that they both apply in the same situation and have effects that cannot both be true together.
Instead, they apply for different situations. The fi …
- 103k