0.28 Phy1250: circular motion -- acceleration and centripetal force  (Page 4/6)

 Page 4 / 6

A three-child operation

It took three children to operate this merry-go-round. One child sat on each end and the third child pushed it around and around as fast as possible.

Oops

We quickly learned that if we sat on the plank between the handle and the end of the plank and tried to hold ontothe handle, we would slide off the end of the plank when the rotation of the plank reached a certain speed. Therefore, we learned to sit with our legs across thehandle, with the handle pressing against the back insides of our knees. By doing this, we could survive without sliding off the plank no matter how fast the third child caused theplank to rotate.

Why am I telling you this?

Although I didn't understand it at the time, when the plank was rotating around its spindle at a relatively high rate of speed, the handle exerted a force on the inside of both knees. Inother words, the handle exerted a force on each leg in the direction of the center of the plank. This is a force that we will call a centripetal force .

Centripetal force

According to The Physics Classroom , any object moving in a circle (or along a circular path) experiences a centripetal force. That is, there is some physical forcepushing or pulling the object towards the center of the circle. This is the centripetal force requirement.

The word centripetal is merely an adjective used to describe the direction of the force. We are not introducing a newtype of force but rather describing the direction of the net force acting upon the object that moves in the circle. Whatever the object, if it movesin a circle, there is some force acting upon it to cause it to deviate from its straight-line path, accelerate inwards and move along a circular path.

A centripetal force on my body

The effect of this centripetal force was to cause my body to accelerate in the direction of the force, which was directly toward the spindle at the center of the plank.The spindle was at the center of the circle around which I was experiencing circular motion (although probably not uniform circular motion).

A weight on a string

Consider tying a weight, such as a full bottle of soda, to the end of a string. Then swing the bottle around and around above your head in anapproximate circle. You will feel a force pulling your hand toward the periphery of the circle, so you will exert a force on the string to keep the bottle fromflying away. The force that you exert on the string will be exerted on the bottle at the other end of the string and that force will be directed along thestring towards the center of the circle. That is the force that we will refer to as centripetal (center seeking) force, and that force will act on the mass ofthe bottle to cause the bottle to accelerate in the direction of the center of the circle.

What happens if the string breaks?

If the string breaks, there will no longer be a centripetal force acting on the bottle and it will fly off into space along a line that is tangential to itslocation on the circle at the instant the string breaks. It won't continue moving in a circle. Instead, it will move in a straight line until the resistance ofthe air and force of gravity bring it to a sudden stop on the ground. (Actually, it will move along a parabolic arc under the force of gravity until it strikesthe ground.)

where we get a research paper on Nano chemistry....?
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
what about nanotechnology for water purification
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
why we need to study biomolecules, molecular biology in nanotechnology?
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
why?
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
Got questions? Join the online conversation and get instant answers!