Force and Acceleration on a Turntable, Part 1
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- Опубликовано: 23 ноя 2024
- Part of NCSSM Online Physics Collection: This video deals with force and acceleration on a turntable. Part 1 of 2. www.dlt.ncssm.edu
Please attribute this work as being created by the North Carolina School of Science and Mathematics. This work is licensed under Creative Commons CC-BY creativecommons...
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This guy knows how to party!
Absolutely
thank you sir! this is how physics should be taught
Friction Force = Maximum Centripetal Force that can be applied on coin
friction coefficient * normal force between coin and disk = mass * (velocity)^2*radial distance between coin and disk
uN = mV^2/r
uNr/m = V^2
V = w * r
uNr/m = w^2 * r^2
uN/m = w^2 * r
uN/mr = w^2
w = sqrt(uN/mr)
w = (uN/mr)^0.5
Using this we can find the disk rpm that will cause coin to slip away
We can see angular speed is inversely proportional to Radial distance so it means large radial distance lower angular speed required to fly off coin which means for any given scenario coin farthest will fly off first and coin nearest to disk center will fly off last
I would like to use this with my students. Do you still have the link to the answer?
Saviour cleared my all doubts
thank you! this was well explained :)
Thank you! It was very helpful.
Sir, i have a question, could you please explain the effect of weight, suppose there are different pennies of different weights placed at same distance from from center, while rotation which one will go outward First? Lighter or heavier? Please
Abdul the weight of the pennies is irrelevant. It does not matter what they weigh.
@@scottsimmons9296 Doesn't the weight affect the friction? And wouldn't a larger friction cause the penny to stay on the turntable longer?
@@rohankrishnakumar7432 Here check this out... you will see that masses will cancel out after going through the maths.
imgur.com/Bfg1KIG
Plus check out the 3 min video explaining what static friction depends on
@@scottsimmons9296 Dear Sir, How a friction force which is considered as centripetal force itself is created towards the center of table?. At the very beginning of rotation of table, a tangent friction force should originate on the penny. Otherwise penny doesn't start to move along a path which is tangent to circle. It is not clear how this tangent friction is converted to a centripetal force.
@@senakawijayakoon This is a great question and one that will need a picture to help with your understanding.
Maybe the simplest way to understand way it points inwards and not tangential is by considering that the object as an isolated system, which means it is best to forget about the turntable.
Consider the motion of the object. You are correct that there must be an initial friction force in the tangential direction which will give an initial velocity to the object.
But now the object wont be going in a straight line for long. It needs to change direction. This occurs by "Some force" acting towards the circle center. The force happens to be friction. What else can it be?
This answer is not detailed enough for someone like you. So here is a link physics.stackexchange.com/questions/277310/why-does-friction-act-radially-inwards-when-a-car-turns
You neglected to show the centrifugal force vector. The fbd representation would have been far better had that been included.
It is still possible to get the link to the video?
@@liutinnamkatrina7165 thanks, even though i forgot what i was even asking for xD
@@liutinnamkatrina7165 Yeah at least at that time we didn't have corona :)
@@kingdemon4236 but corona is gone anyway
This analysis is incorrect. When the speed of the object is increasing, it has a tangential acceleration caused by a tangential component of the static friction.
The tangential component + the centripetal component make the static friction vector. The magnitude of this vector equals the magnitude of the maximum static friction when the object begins to slide off.
صحيح
The analysis is correct. He simply illustrated it using gradually increasing speed. He could also have said the speed increased in an infinite number of steps.
centripetal force = frictional force
In this case, yes.
Where is Coriolis force?
It is a Pseudo Force
To experience it You need to put camera on disk
In given test setup you are basically at inetial frame
Your camera is at rest
ابو علي المجد
If only we could make aircraft like this but some don’t want it that way and some we don’t say