Most misunderstood physics concept

[newjerseyrunner]

Being in space vs being in orbit.

I saw so many people wonder why the guy who BASE jumped from the edge of space didn't burn up in the atmosphere the way the space shuttle does. Seems very few people understand that the shuttle doesn't float in space but has ridiculously high lateral velocity which allows it to fall at the same rate as the curvature.

 

[FactChecker]

Conservation of momentum. When a movie shows a shotgun fired with almost no kick and the person hit gets thrown across the room.

EDIT: I see this is really the same as @Nidum 's post #49.

 

[OmCheeto]

Conservation of momentum. When a movie shows a shotgun fired with almost no kick and the person hit gets thrown across the room.

Fargo, season 2, episode 10, 33:20 from the end.

So glad I wasn't an uber science nerd when I first watched Star Trek TNG.
I recently went back and watched the last three seasons, to see if I had missed an episode, and cringed...

#1; "The anomaly is near the north pole"
Capt; "Very well. Ensign, put us into a synchronous orbit above the north pole"​

And I laughed...

ah hmmm...

Probably not on topic, but that would make a fun thread: "Sciencey things that Hollywoodians get confused with real life":

What's a synchronous orbit?
Probably like synchronized swimming. Things just go round and round.

 

[Farang]

I'm not making fun of the Copenhagen interpretation, I'm making fun of the popularizers who to this day continue to misrepresent quantum mechanics.

What is your take on the subject please? Do you think the many worlds interpretation is correct?

 

[Farang]

Well, since physics is the only real science, evolution must be part of it as well. So yeah, evolution. That makes it what, 44% population of the US and 28% UK(even worse in other places), just don't get it.

 

[XZ923]

IMO the answer to this question can't be anything to do with quantum mechanics or relativity because few people actually pay attention to subjects like that. If we're going for quantity of misunderstanding rather than quality (and yes I do know that understanding or lack thereof cannot be quantified) I think you need something everyone's actively engaged in and most don't understand. Thus it has to be a very basic principle.

I admit I'm biased but IMO the most misunderstood concept has to be the concept of P=VI. Electrical labels are ubiquitous in our society, we all read them, and the lack of understanding of the basic units of wattage, voltage, and amperage is almost as ubiquitous as the labels themselves. Note I did specifically separate it from Ohm's Law because a lot of folks don't do resistance measurements, but everyone's gone to Home Depot or Lowe's thinking "I need a 55W bulb" without any kind of understanding as to what that actually means.

 

[Windadct]

"Not everyone can understand all of physics" : IMO no one can!

People (silly humans) seem very uncomfortable when a concept is beyond their mental grasp, and they then MAKE UP an explanation that suits them, no matter how wrong that may be. The longer the have this explanation in mind and do not learn otherwise, the harder it is for them to accept the accurate theory, or even more difficult to accept that their concept is wrong and they still can not grasp the correct concept. i.e. going from "knowing" to not knowing.

This is why we HAVE TO FIGHT pseudoscience in our schools.

 

[Andy SV]

I used to work with a mechanic who thought making the gear in the back of a bike bigger made you go faster as in top speed faster not merely quicker
I turned him down when he offered to work on my kz650
My cousin swore up and down that the way to make power in a car is to have more vacuum in a carburetor. I was of the opinion that more fuel and air was the trick.

 

[Andy SV]

IMO the answer to this question can't be anything to do with quantum mechanics or relativity because few people actually pay attention to subjects like that. If we're going for quantity of misunderstanding rather than quality (and yes I do know that understanding or lack thereof cannot be quantified) I think you need something everyone's actively engaged in and most don't understand. Thus it has to be a very basic principle.

I admit I'm biased but IMO the most misunderstood concept has to be the concept of P=VI. Electrical labels are ubiquitous in our society, we all read them, and the lack of understanding of the basic units of wattage, voltage, and amperage is almost as ubiquitous as the labels themselves. Note I did specifically separate it from Ohm's Law because a lot of folks don't do resistance measurements, but everyone's gone to Home Depot or Lowe's thinking "I need a 55W bulb" without any kind of understanding as to what that actually means.

I have always thought measuring a light by wattage is silly
When there is a perfectly good lumin

 

[mikeyBoy83]

It is my opinion, as an instructor of physics, that one of the most misunderstood concepts is that of Newtonian dynamics. A lot of people that have a first encounter with physics misunderstand the basic notions of force and as a result motion. This leads to misconceptions in almost any other topic in advanced physics.

 

[Deneen2000]

Two items come to mind:

1. For the "Average Joe," I suggest the atom whirl symbol which falsely depicts electrons as merely particles orbiting.

2. That straight lines exist.

 

[PhDeezNutz]

A lot of the stuff you guys are talking about goes over my head and I'm graduating with my BS in physics in a couple of weeks. I'm not the greatest student but I am going to grad school. I guess that's just a sign that I need to work harder.

 

[dkotschessaa]

A lot of the stuff you guys are talking about goes over my head and I'm graduating with my BS in physics in a couple of weeks. I'm not the greatest student but I am going to grad school. I guess that's just a sign that I need to work harder.

Going into grad school thinking you don't understand anything is probably the best way to start out. :D

 

[John Robert Manley]

What do you think is the most misunderstood concept in physics and why? I'm guessing it's something in QM or relativity, but maybe somewhere else?

Hi Greg,
This is my first ever post on a Physics Forum.
For me the thing I have most difficulty understanding is quantum entanglement.
Is it at all possible that the two particles could in fact be just a single particle?
I like the spinning coin analogy that says if you observe on side of the coin as 'heads', the other side must be 'tails'
The moment you observe the qualities of one particle, you instantly know the qualities of the other.
But could it be that the two entangled particles were really only one particle with opposite qualities?
The quantum world is so strange it seems that almost anything is possible.

 

[Carrock]

And to stay on topic, for the most misunderstood concept, I nominate Big Bang. It seems especially prone to breeding misplaced sense of understanding both in laymen and in people who should know better. I blame the name.

Fred Hoyle is still causing problems with Big Bang 60 years after he derisively named the concept...

 

[jim hardy]

entropy.

 

[mfb]

Is it at all possible that the two particles could in fact be just a single particle?

No.
You can even entangle completely different things, like an atom and a photon.

 

[Hendrik Boom]

In fact, if your friend observes a particle, she will then be entangled with the particle, and you can find out the state of the particle simply by asking your friend.