Another simple machine based on the inclined plane is the blade, in which two inclined planes placed back to back allow the two parts of the cut object to move apart using less force than would be needed to pull them apart in opposite directions.
To calculate the forces on an object placed on an inclined plane, consider the three forces acting on it.
We can break the force from gravity into two vectors, one perpendicular to the plane and one parallel to the plane. Since there is no movement perpendicular to the plane, the component of the gravitational force in this direction ("mg" cos "θ") must be equal and opposite to normal force exerted by the plane, "N". Therefore, formula_1.
If the component of the force from gravity parallel to the surface ("mg" sin "θ") is greater than the static frictional force "f" – then the body will slide down the inclined plane with acceleration where "f" is the force of friction – otherwise it will remain stationary.
When the angle of the slope ("θ") is zero, sin "θ" is also zero, so the body will not move.
Jamestown, New York
Jamestown is a city in southwestern New York State, United States.
Lego
LEGO is a type of building toy created and made by The Lego Group, a company from Denmark. LEGO bricks are colorful plastic building blocks that can be joined together easily to make a tower, house, and more. LEGO bricks are joined together by studs on the top, and holes in the bottom of the brick commonly known as the brick-and-knob connection. LEGO is the most popular building toy in the world.
The LEGO Group was started by Ole Kirk Christiansen, a Danish toy maker, in 1935. Christiansen made wooden toys for children. He made and sold his first plastic LEGO sets in the 1940s. Since then, LEGO has become very popular and are known and loved by people around the world kids and adults alike.
LEGO bricks come in many shapes, sizes and colors. There are wheels, car screens, and plants. LEGO bricks can be joined together in many ways. Vehicles, buildings and even robots can all be built with LEGO bricks.
All the bricks from LEGO sets can fit together. New bricks made today can fit with old bricks made years ago. The bricks can join together no matter which set they come from. LEGO has become so popular that people sometimes use the word "Lego" to talk about any sort of building blocks. There are millions of LEGO fans and many LEGO conventions around the world.
Many LEGO video games are being created for different video game systems. LEGO video games usually come from LEGO themes, such as LEGO Star Wars. LEGO Star Wars has five video games, and the sixth LEGO Star Wars was came out in 2020. Other LEGO video games include LEGO Indiana Jones, LEGO Harry Potter, and LEGO Pirates of the Caribbean.
A LEGO Cartoon Network show "" was aired from 2011 to 2012, and a second Cartoon Network LEGO show aired in 2013. In 2014 "The LEGO Movie" was released, starring Chris Pratt, Will Arnett, Elizabeth Banks, Morgan Freeman, Will Ferrell, and Liam Neeson. The movie was released on February 7, 2014. Since then, three other LEGO movies have been made, like The LEGO Batman Movie, The LEGO Ninjago Movie, and .
Giant panda
The giant panda, "Ailuropoda melanoleuca", is a bear. It lives in south central China.
Although it belongs to the order Carnivora, the panda's diet is 99% bamboo. Pandas in the wild occasionally eat other grasses, wild tubers, or even meat in the form of birds, rodents or carrion. In captivity, they may get honey, eggs, fish, yams, shrub leaves, oranges, or bananas along with specially prepared food.
The giant panda lives in a few mountain ranges in central China, mainly in Sichuan province, but also in the Shaanxi and Gansu provinces.
As a result of farming, deforestation and other development, the panda has been driven out of the lowland areas where it once lived.
Giant pandas are bears. They have black and white fur all around them. The black fur is on their ears, around their eyes, on their legs, and on their shoulders.
Giant pandas are about the size of an American black bear. They are about tall at the shoulder when they are standing on all four legs. They are about long. Males weigh up to in the wild. Females usually weigh less than .
Wild giant pandas have lived in the mountains of central China. They live in forests of tall trees. They eat the bamboo that grows under the trees. The weather is rainy and misty in the mountain forests. There are thick clouds almost all the time.
Bamboo is the main diet of panda . Ninety-nine percent of the food they eat is bamboo. They eat as much as of bamboo every day. They spend 10 to 16 hours every day looking for food and eating it.
Bamboo is a grass. Sometimes giant pandas eat other grasses. They also eat little rodents or musk deer babies (fawns). In zoos, giant pandas eat bamboo, sugar cane, vegetables, and fruit.
Giant pandas get a lot of water from the bamboo they eat. They need more water though. They drink from the fresh water streams and rivers in the mountain. Melting snow high in the mountains runs into these streams and rivers.
There are two kinds of giant panda. They both live in China. The best known is the black and white panda. Its scientific name is "Ailuropoda melanoleuca melanoleuca".
The other giant panda has dark brown and light brown fur. Its skull is smaller than the other giant panda. It has larger molars. This panda lives only in the Qinling Mountains. Its scientific name is "Ailuropoda melanoleuca qinlingensis".
Giant pandas are ready to have babies (cubs) when they are between the ages of four and eight years. They may be able to have babies until about age 20. Female pandas are ready to have a baby only once a year. This is in the springtime. There are only two to three days she is ready for a baby. Calls and scents bring the males and female pandas to each other.
Female pandas may give birth to two young. Usually only one lives. Giant panda cubs may stay with their mothers for up to three years. Then they leave her for a life of their own.
Today, the giant panda is a symbol for China. It is protected by the Chinese government. Killing a giant panda is a crime. The giant panda may become extinct. It will die out if the forests of bamboo continue to disappear.
People outside of eastern Asia did not know about the giant panda until 1869. The first "Westerner" to see a live panda was a German zoologist in 1916. In 1936, Ruth Harkness became the first Westerner to bring a live giant panda out of China. It was a cub (baby panda) named Su-Lin. The cub was taken to live at the Brookfield Zoo in Chicago.
In the 1970s, China began showing giant pandas in zoos in the United States and Japan as a type of diplomacy. This happened until 1984, when China changed how this was done. Starting in 1984, China would allow zoos to keep the giant pandas for 10 years, but the zoo would have to pay China up to $1,000,000 each year. Also, the zoo would have to agree that any cubs born would belong to China.
17 cities outside China have zoos with giant pandas.
The Adelaide Zoo in Adelaide, Australia received two giant pandas in 2009.
The giant panda is an endangered species. It may become extinct. In 2013, it was estimated that there were less than 2,500 mature giant pandas living in the wild. Illegal hunting is no longer a problem. Hunting for pandas is a crime. The penalties are harsh if you hunt pandas.
The greatest threat to survival is the loss of living areas. People are ruining the areas where pandas live. They are cutting down trees. They are building farms. Groups of pandas are forced to live in small areas. They are isolated. They cannot mix other panda groups.
Giant pandas eat bamboo. Sometimes the bamboo dies off. At one time, pandas could move to an area where bamboo was still growing. Moving has become more and more difficult. People are living and working in panda areas. Pandas cannot move about as freely as they once did.