How do space and gravity work together?
Moon, earth and gravity
06 June 2016
Have you ever seen a fruit or object fall from a tree? Have you ever thrown a stone and watched it fall? The force that makes objects “fall” is called gravity.
It is also gravity that pulls us steadily towards the earth. Because of gravity, our feet stay on the ground. We don't have to touch the earth directly to be attracted to it. Gravity works as long as we are not too far away. Due to gravity, the earth orbits the sun and the moon orbits the earth.
Gravity depends on the mass of an object. The force of gravity acting between two objects is proportional to the mass of the objects and decreases very quickly as these objects move away from each other. We ourselves also attract objects with “our” gravity, but we have far too little mass to be able to recognize an effect! The sun, on the other hand, is so huge that it holds the earth tight with its gravity even though it is so far away. The moon also has gravity. Since it is smaller and lighter than the earth, we would weigh only one sixth as much on the moon as we do here on earth.
One can, of course, wonder why the moon doesn't fall to earth like an apple from a tree. That's because the moon never stands still. He is constantly moving around the earth. Without the earth's gravity, it would float off into space. Because of this mixture of speed and distance from Earth, the moon is in a permanent balance between falling and escaping. If it were faster, it would float away. If he were slower, he would fall to the ground.
As we said before, gravity also depends on distance. If we could move far enough from the earth, we would escape its gravity. That's exactly what we're trying to do with spaceships. When taking off, they must reach at least the so-called escape speed of 11.2 km / s. (At this speed it would only take 10 minutes to travel from London to New York!) When a spaceship reaches the escape speed, it overcomes the gravitational force of the earth and gets into the solar system.
In a spaceship or a space station in orbit, we do not feel the earth's gravity. Objects don't fall down, they float. When you jump up, you don't fall back on the ground. This is exactly what happens to astronauts in a space station orbiting the earth!
- Why is it bad to be proud?
- Why is music not enjoyable
- What kind of food do you eat
- All cars have an OBD connector
- How do you explain population growth
- Why do churches have crosses
- Bitcoin investments are still hot
- Is Draco related to Sirius
- Why do nice people get friendship zones
- How is the environment in DU colleges
- Why is everything so cheap in Poland?
- What is a kilogram
- What is contaminated milk
- How do I help others make money
- What is a crore of rupees in dollars
- How does neuroscience explain introversion
- Can tear your abs during pregnancy
- What is 7x 70
- Should I have a maid
- Why is the sky blue 100
- How can I stop the procrastination 3
- What does Sotoy mean in Indonesian slang
- How powerful are lichens in D D.
- How can I excel in Excel
- How common is hypergamy in women
- Why is sex so addicting and so much fun
- Was Minecraft ever free
- Is a television a computer Why
- What happens if you take baking soda
- Where does nationalism come from?
- How do the hackers communicate
- What's the best Wix alternative
- How do I become a product designer
- Which engineering branch is the toughest