The whole of physics, mechanics and dynamics got its basis for calculation with Newton's discovery and definition of the theory of gravity. Isaac Newton was an 18th century physicist, often considered the father of modern physics, thanks to his knowledge of calculus, his theory of gravity and his laws of motion, known as Newton's Laws. The entire Newtonian physics has its origins precisely in the discovery of the gravity.
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ISAAC NEWTON'S THEORY OF GRAVITY
The theory of gravity indicates that all bodies attract each other. This force of attraction experienced by two bodies endowed with mass is directly proportional to the product of their masses and inversely proportional to the square of the distance separating them, and would correspond to the formula F = G Mm/d2where G would be the gravitational constant, M and m the mass of the 2 bodies and d the distance between them.
The greater the mass of the body, the greater its attraction. The earth attracts objects because of its large mass. On the moon gravity is less because its mass is smaller. On planets larger than the earth, the force of gravity will be greater.
GRAVITY AND THE FORCE OF GRAVITY
Although they are two similar terms, it is worth noting that when we talk about gravity we are talking about a accelerationHowever, when talking about the force of gravity we speak of a force. On earth, the most common example we all have would be our weight. Our weight depends on our mass and gravity. Following Newton's second law.
Force = mass x acceleration . The acceleration to which we are all subjected is gravity, hence our weight: Weight = mass x gravity.
HOW MUCH IS GRAVITY ON EARTH
Gravity on earth is 9.8m/s2 (where m is metres and s seconds). It is often reduced to 10m/s2 to simplify calculations. The higher you go up, the more the earth's gravity on us decreases, as we increase the distance. And as you can see from the theory of gravity, the force of gravity depends on distance. As we leave the atmosphere, gravity decreases, until we reach space, where gravity is less. It is a mistake to think that in a space station or on a spacecraft gravity is zero. Yes, there is gravity. The effect that they are floating is because astronauts in space are in continuous free fall.
HOW MUCH IS GRAVITY IN WATER
Gravity in water is the same gravity as gravity on land, i.e. 9.8m/s2 . The weight of an object is less because of the upward thrust of the water. This corresponds to Archimedes' first principle. Gravity, however, is the same as on earth. It only decreases when we move away from the earth (e.g. in space).
HOW MUCH GRAVITY IS ON THE MOON
Gravity on the moon is much smaller than on the Earth. It has to be said that the gravity on the Moon is no longer exerted by the Earth, but by the Moon itself, which is of a much better size than the Earth. It is equivalent to 1.622 m/s² 1.622 m/s² 1.622 m/s² 1.622 m/s
This means that if your weight on earth is 600 Newton (equivalent to a mass of 60Kg), on the moon it would be 97.32 Newton. In other words, the force you would feel on your body would be only 16.22% less than the force you feel on Earth, and hence the possibility of making bigger jumps, and the sensation of buoyancy.
HOW MUCH GRAVITY IS ON MARS
Gravity on Mars is 3.711 m/s². It is a planet smaller than Earth and the weight you would experience on Mars would be about 1/3 of what you experience on Earth.
HOW MUCH IS GRAVITY IN SPACE
Gravity in space depends on how high you are in space, and under the effect of the gravity of which planet you are on. In the case, for example, of the international station orbiting the earth, the gravity is about 90% of what we have on earth. The floating effect experienced by the astronauts on the international station is due to the free fall the station is experiencing around the earth.
EINSTEIN'S THEORY OF GRAVITY
Isaac Newton's theory of gravity is fully valid for objects on Earth, machinery and the study of forces. However, it is no longer valid in many cases in space, as soon as velocities close to the speed of light are taken. This is why Einstein defined the theory of universal gravity, in which he defines that gravity, which is present whenever two bodies exist, is not a force. It would be a geometry, a space-time warp. In parallel he defines the theory of relativity, where the velocities with which we see another body moving are always relative to its own velocity. For today's physics on earth, however, Newton's theory of gravity is still used, which is fully valid for problems on the earth.
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