A rotation is a circular movement of an object around a center (or point) of rotation. A three-dimensional object can always be rotated around an infinite number of imaginary lines called rotation axes. If the axis passes through the body's center of mass, the body is said to rotate upon itself, or spin. A rotation about an external point, e.g. the Earth about the Sun, is called a revolution or orbital revolution, typically when it is produced by gravity. The axis is called a pole.

This live-action video program is about the word rotation. The program is designed to reinforce and support a student's comprehension and retention of the word rotation through use of video footage, photographs, diagrams and colorful, animated graphics and labels. Viewers will see and hear rotation used in a variety of contexts providing students with a model for how to appropriately use the word. Related words are also used and reinforced with visuals and text.

In astronomy, rotation is a commonly observed phenomenon. Stars, planets and similar bodies all spin around on their axes. The rotation rate of planets in the solar system was first measured by tracking visual features. Stellar rotation is measured through Doppler shift or by tracking active surface features.

This rotation induces a centrifugal acceleration in the reference frame of the Earth which slightly counteracts the effect of gravity the closer one is to the equator. One effect is that an object weighs slightly less at the equator. Another is that the Earth is slightly deformed into an oblate spheroid.

Another consequence of the rotation of a planet is the phenomenon of precession.

While revolution is often used as a synonym for rotation, in many fields, particularly astronomy and related fields, revolution, often referred to as orbital revolution for clarity, is used when one body moves around another while rotation is used to mean the movement around an axis. Moons revolve around their planet, planets revolve about their star (such as the Earth around the Sun); and stars slowly revolve about their galaxial center. The motion of the components of galaxies is complex, but it usually includes a rotation component.

The speed of rotation is given by the angular frequency (rad/s) or frequency (turns per time), or period (seconds, days, etc.). The time-rate of change of angular frequency is angular acceleration (rad/s²), caused by torque. The ratio of the two (how heavy is it to start, stop, or otherwise change rotation) is given by the moment of inertia.

The angular velocity vector (an axial vector) also describes the direction of the axis of rotation. Similarly the torque is an axial vector.

The physics of the rotation around a fixed axis is mathematically described with the axis–angle representation of rotations. According to the right-hand rule, the direction away from the observer is associated with clockwise rotation and the direction towards the observer with counterclockwise rotation, like a screw.

The laws of physics are currently believed to be invariant under any fixed rotation. (Although they do appear to change when viewed from a rotating viewpoint: see rotating frame of reference.)

In modern physical cosmology, the cosmological principle is the notion that the distribution of matter in the universe is homogeneous and isotropic when viewed on a large enough scale, since the forces are expected to act uniformly throughout the universe and have no preferred direction, and should, therefore, produce no observable irregularities in the large scale structuring over the course of evolution of the matter field that was initially laid down by the Big Bang.

In particular, for a system which behaves the same regardless of how it is oriented in space, its Lagrangian is rotationally invariant. According to Noether's theorem, if the action (the integral over time of its Lagrangian) of a physical system is invariant under rotation, then angular momentum is conserved.

Bully Education on the Learning Videos Channel

Bullying is the use of force, coercion, or threat, to abuse, aggressively dominate or intimidate. The behavior is often repeated and habitual. One essential prerequisite is the perception (by the bully or by others) of an imbalance of physical or social power. This imbalance distinguishes bullying from conflict. Bullying is a subcategory of aggressive behavior characterized by the following three minimum criteria: (1) hostile intent, (2) imbalance of power, and (3) repetition over a period of time. Bullying is the activity of repeated, aggressive behavior intended to hurt another individual, physically, mentally, or emotionally.

Bullying ranges from one-on-one, individual bullying through to group bullying, called mobbing, in which the bully may have one or more "lieutenants" who may be willing to assist the primary bully in their bullying activities. Bullying in school and the workplace is also referred to as "peer abuse". Robert W. Fuller has analyzed bullying in the context of rankism. The Norwegian researcher Dan Olweus says bullying occurs when a person is "exposed, repeatedly and over time, to negative actions on the part of one or more other persons", and that negative actions occur "when a person intentionally inflicts injury or discomfort upon another person, through physical contact, through words or in other ways". Individual bullying is usually characterized by a person behaving in a certain way to gain power over another person.

A bullying culture can develop in any context in which humans interact with each other. This may include school, family, the workplace, the home, and neighborhoods. The main platform for bullying in contemporary culture is on social media websites. In a 2012 study of male adolescent American football players, "the strongest predictor [of bullying] was the perception of whether the most influential male in a player's life would approve of the bullying behavior."

Bullying may be defined in many different ways. In the United Kingdom, there is no legal definition of bullying, while some states in the United States have laws against it. Bullying is divided into four basic types of abuse – psychological (sometimes called emotional or relational), verbal, physical, and cyber.

Biomass is plant or animal material used for energy production (electricity or heat), or in various industrial processes as raw material for a range of products. It can be purposely grown energy crops, wood or forest residues, waste from food crops (wheat straw, bagasse), horticulture (yard waste), food processing (corn cobs), animal farming (manure, rich in nitrogen and phosphorus), or human waste from sewage plants.

Burning plant-derived biomass releases CO2, but it has still been classified as a renewable energy source in the EU and UN legal frameworks because photosynthesis cycles the CO2 back into new crops. In some cases, this recycling of CO2 from plants to atmosphere and back into plants can even be CO2 negative, as a relatively large portion of the CO2 is moved to the soil during each cycle.

Cofiring with biomass has increased in coal power plants, because it makes it possible to release less CO2 without the cost associated with building new infrastructure. Co-firing is not without issues however, often an upgrade of the biomass is beneficiary. Upgrading to higher grade fuels can be achieved by different methods, broadly classified as thermal, chemical, or biochemical.

Thermal conversion processes use heat as the dominant mechanism to upgrade biomass into a better and more practical fuel. The basic alternatives are torrefaction, pyrolysis, and gasification, these are separated principally by the extent to which the chemical reactions involved are allowed to proceed (mainly controlled by the availability of oxygen and conversion temperature).

There are other less common, more experimental or proprietary thermal processes that may offer benefits, such as hydrothermal upgrading. Some have been developed for use on high moisture content biomass, including aqueous slurries, and allow them to be converted into more convenient forms.

A range of chemical processes may be used to convert biomass into other forms, such as to produce a fuel that is more practical to store, transport and use, or to exploit some property of the process itself. Many of these processes are based in large part on similar coal-based processes, such as the Fischer-Tropsch synthesis. Biomass can be converted into multiple commodity chemicals.

As biomass is a natural material, many highly efficient biochemical processes have developed in nature to break down the molecules of which biomass is composed, and many of these biochemical conversion processes can be harnessed. In most cases, microorganisms are used to perform the conversion process: anaerobic digestion, fermentation, and composting.

Biomass can be directly converted to electrical energy via electrochemical (electrocatalytic) oxidation of the material. This can be performed directly in a direct carbon fuel cell, direct liquid fuel cells such as direct ethanol fuel cell, a direct methanol fuel cell, a direct formic acid fuel cell, a L-ascorbic Acid Fuel Cell (vitamin C fuel cell), and a microbial fuel cell. The fuel can also be consumed indirectly via a fuel cell system containing a reformer which converts the biomass into a mixture of CO and H2 before it is consumed in the fuel cell.

Learn cool facts about vegetables in this lesson video for children!

Music credit:
"Galway" Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 4.0 License
http://creativecommons.org/licenses/by/4.0/

This video was originally uploaded as a shortened version of my Vegetables for Kids video.

Thanks for watching! I hope you have an AMAZING day!

Daniel
"Homeschool Pop"

Did you know gorillas are as strong as bulldozers? In fact, they are one of the strongest animals on the planet! In Gorillas for Kids, you'll learn exactly why that is. Gorillas use their strong arms and hands to gather food and build comfortable nests for resting. This strength also helps them swing from tree branches and move through their thick forest homes. And, of course, it helps them protect the troop, maintain order, and defend their territory.

When it comes to hygiene, gorillas are experts at grooming each other. Grooming is when an animal carefully cleans the fur of other group members. Gorillas use their fingers to pick out dirt, leaves, and parasites from each other's fur. This grooming behavior serves several vital purposes. First, it helps gorillas build and strengthen their social bonds. Second, it helps gorillas stay healthy and clean. Through grooming, they can avoid infections and keep their coats in good condition.

Gorillas are wonderful parents. They treat their young ones with a lot of care and love. Baby gorillas are called infants, and their moms are very protective of them. Moms carry their infants on their backs to keep them close. As the young gorillas grow, they learn essential things from their moms and the rest of the troop, such as what to eat and how to behave. This helps them grow up strong and prepares them to live on their own in the forest one day.

We hope you and your student(s) enjoyed learning about such interesting apes! If you want to learn even more, head over to our website and download one of our many lesson plans about animals, full of activities, worksheets, and more!

https://learnbright.org/lessons/science/gorillas/
https://learnbright.org/lesson....s/science/reptiles-a

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What you will learn in Gorillas for Kids:
0:00 Introduction
0:22 What is a gorilla?
1:32 Gorillas are wonderful parents
2:03 Diet of a gorilla
3:23 Other interesting facts
4:45 Common traits between gorillas and humans
5:24 Why are they important to the environment?
6:38 Review of the facts

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#gorillas
#apes
#mammals

What's the difference between a wildcat and a wild cat? Well, you could probably say you own a wild cat as a pet because of its crazy personality. But yours would not be considered a wildcat. In this video, you and your kids will learn interesting facts about a group of species that scientists call wildcats, such as tigers, lions, jaguars, cheetahs, and leopards.

Wildcats are carnivorous, so they eat a lot of meat. They have excellent eyesight and hearing to help them find and capture their prey. Their diet includes antelopes, rabbits, giraffes, and even reptiles for some of them. Wildcats that live near human settlements often prey on poultry like ducks and geese.

These majestic animals are part of every culture and can be found on the oldest of cave drawings. They are often the face of companies and sports teams as mascots. Sadly, lots of wildcat species are endangered, and many others are vulnerable or near threatened. Their populations are declining because of habitat loss. Sometimes, habitat loss happens naturally, but in most cases, it's because of the increased use of land by humans for homes, buildings, and roads.

We hope you and your student(s) enjoyed learning about these cool cats! If you want to learn even more, head over to our website and download one of our many lesson plans about animals, full of activities, worksheets, and more!

https://learnbright.org/lessons/science/wildcats/
https://learnbright.org/lesson....s/science/reptiles-a

Thank you for watching and learning with us! We’re constantly releasing new content and videos, so click that “Subscribe” button and you’ll get notified.

What you will learn in Wildcats for Kids:
0:00 Introduction
0:22 What are wildcats?
1:38 Wildcats as a group of cat species
2:26 Carnivorous diet of a wildcat
3:21 Other interesting facts
4:36 Why wildcats are important to the environment
5:47 Review of the facts

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*Teachers and Parents! Did you know? In addition to these great videos, we have also created a library of high-quality and engaging lessons for your elementary aged student(s). Visit us, sign up for a free account, and instantly you'll have access to thousands of lesson plans, learning materials, teaching instructions, activities, and assignments that your kids will really enjoy! We hope to see you soon!

Browse our entire collection of Science lesson plans: https://learnbright.org/lessons/?filter_subject=science

#wildcats
#mammals

As you may know hummingbirds are the smallest birds on the planet. In Hummingbirds for Kids, you'll learn even more cool facts about these little birds! For one, there are over 350 different species of hummingbirds, making it the second-largest bird family in the world? Only 17 species of hummingbird live in the United States. The rest live in Central and South Americas. And they're the only bird that can fly backward.

Hummingbirds get their energy from the nectar of flowers, or from nectar people make themselves using water and sugar. Because they have such a fast metabolism, hummingbirds have to eat all day long! They can't live just on sugar, though. They need protein, minerals, and vitamins, which they get by eating small bugs.

These little birds are well known for their great courage. The ancient Aztecs would wear necklaces made of hummingbird feathers before going into battle. They believed the hummingbird represented courage and power. Despite their small size, they defend their territories against larger birds.

We hope you and your student(s) enjoyed learning about these interesting birds! If you want to learn even more, head over to our website and download one of our many lesson plans about animals, full of activities, worksheets, and more!

https://learnbright.org/lesson....s/science/hummingbir

Thank you for watching and learning with us! We’re constantly releasing new content and videos, so click that “Subscribe” button and you’ll get notified.

What you will learn in Hummingbirds for Kids:
0:00 Introduction
0:21 What are hummingbirds?
1:25 Diet of a hummingbird
2:31 Interesting facts
3:52 Why hummingbirds are important to the environment
4:47 Review of the facts

Find and Follow Us Online:
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*Teachers and Parents! Did you know? In addition to these great videos, we have also created a library of high-quality and engaging lessons for your elementary aged student(s). Visit us, sign up for a free account, and instantly you'll have access to thousands of lesson plans, learning materials, teaching instructions, activities, and assignments that your kids will really enjoy! We hope to see you soon!

Browse our entire collection of Science lesson plans: https://learnbright.org/lessons/?filter_subject=science

#hummingbirds
#birds

In today's lesson, Miss V will teach you how to spell some basic English words using a matching letter game toy. In this activity, kids will improve their vocabulary and reading skills. Your kids will learn matching and letters while improving their memory through this activity.

In this cool video, you'll learn how to spell the names of various vegetables through colorful animations and cheerful music. Perfect for young learners, this video makes spelling practice enjoyable and helps build vocabulary in an entertaining way.

Visit our website and download our mobile app! https://thekidspictureshow.com/

Welcome to the Kids' Picture Show! We use simple, clear language to teach basic concepts in language and math to toddlers, preschoolers, kindergartners and elementary school-age students. Our videos reach a broad international audience and promote children's reading readiness and literacy. Kids can learn animals, vehicles, verbs, food groups, planets, shapes, colors, numbers, the alphabet, communications skills and more.

We have a board book series published by Penguin Workshop based on our popular vehicles and animals videos. The child literacy experts from Dolly Parton's Imagination Library even selected our books as USA Blue Ribbon Selections for 2020 and 2021!

Our videos are great for all kids including reluctant learners, visual learners, ESL students and children with developmental disabilities such as autism. The clear and simple animated visuals and audio cues are designed to encourage children to read and vocalize. Parents and educators can read along, too. Check us out!

DIY School Crafts | Back to School Craft for Kids

Today we have 5 easy DIY School Crafts for you to make. Be the envoy of all your friends with cute and fun crafts for when you go Back to School

I have listed the crafts below with the start times

Kawaii 1 Page Notebook
Kawaii Corner Bookmark - 2:19
Unicorn Corner Bookmark - 5:43
Donut Notebook - 8:10
Donut Pencil Topper - 10.21

I hope you have enjoyed these easy kids crafts and if you like what you see don't forget to Subscribe and click on the notification bell so you don't miss any Easy Kids Craft ideas.

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💖 Check out our others channels 💖

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hello friends, Today I'm posting a video of 3d paper apple. Actually its like honeycomb. you can make it and gift it to your friends. also can use for school projects. i hope u like this one. Happy crafting :)

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8 DIY paper crafts | Paper toys
8 DIY paper crafts | Paper toys | DIY easy paper crafts

1 - 0:05
2 - 3:40
3 - 6:08
4 - 8:57
5 - 11:51
6 - 14:59
7 - 20:48
8 - 23:02

how to make paper toys
DIY paper crafts

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Greeting cards | how to make greeting cards - https://goo.gl/tQBzVm
How to make paper box easy - Easy paper box - https://goo.gl/jfMuq8
How to make paper toys - Paper toys - DIY paper toys - https://goo.gl/vtJACJ
How to make paper flowers - diy paper flowers https://goo.gl/T5JQiF
DIY paper bag | How to make paper bag https://goo.gl/BSh5ZS
Paper crafts for school - https://goo.gl/X7p3Ha
____________
#paper #crafts #diy
8 DIY paper crafts | Paper toys
https://youtu.be/7HdwaJXfjuk
___________
Follow us on
123 Easy Paper Crafts - https://www.youtube.com/channe....l/UCXUH2dmTnXMSxmJfp
Instagram: https://www.instagram.com/123easypaper/

7 DIY Paper toys paper crafts
7 DIY paper crafts | Paper toys
7 DIY paper crafts | Paper toys | DIY easy paper crafts

how to make paper toys
DIY paper crafts

___
Greeting cards | how to make greeting cards - https://goo.gl/tQBzVm
How to make paper box easy - Easy paper box - https://goo.gl/jfMuq8
How to make paper toys - Paper toys - DIY paper toys - https://goo.gl/vtJACJ
How to make paper flowers - diy paper flowers https://goo.gl/T5JQiF
DIY paper bag | How to make paper bag https://goo.gl/BSh5ZS
Paper crafts for school - https://goo.gl/X7p3Ha
____________
#paper #crafts #diy
7 DIY Paper toys paper crafts
https://youtu.be/B7vqkcQdztw
___________
Follow us on
123 Easy Paper Crafts - https://www.youtube.com/channe....l/UCXUH2dmTnXMSxmJfp
Instagram: https://www.instagram.com/123easypaper/

Home Based School is specially designed this lesson for the audience who learn basic English vocabulary skills and teach about Animals Name and also teach to your friends, family members and relatives. Animals Name Vocabulary helps you to understand in English and used this words worldwide circle so learn their names in English. English is very important for improving our English vocabulary skills. This lesson will help you to enhance your English vocabulary at all levels.
#Animals
#EnglsihVocabulary
#AnimalsName
#homebasedschool

@Nizam's Direction
Story and Directed by Mohamed Nizam

If this video helps you, you can support us by buying us a coffee by clicking here https://www.buymeacoffee.com/tecknowledgemv
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This is an educational video for kids to learn thaana letters. Support us by subscribing to this channel and liking the video and share this to your friends. Our aim is to make more videos like this so do comment.

#Maldivian language

⁣Letter - F

⁣Vaahaka - ކައިނާ އާއި މާމަގެ މިރުސް ގަސް

⁣Sight words

⁣STORY - Ice cream