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Isaac Newton
Isaac Newton
Isaac Newton, a scientist from the 1600s, discovered that the force of gravity depends on mass and distance.
The more mass an object has, the stronger its gravity.
The closer two objects are, the stronger the force of gravity between them.
Gravity is a Force
Gravity is a Force
Gravity is a force that pulls objects toward each other. A force is a push or a pull.
Objects don’t need to touch for gravity to work.
For example, even though the Moon is 230,900 miles away, the Earth pulls it into orbit. The moon pulls back on the earth causing tides!
Planets Orbit the Sun
Planets Orbit the Sun
Planets in our solar system move around the Sun in paths called orbits. The Sun’s gravity pulls them in, while their speed and inertia keeps them from falling into the Sun.
Spacecraft and satellites orbit Earth in a similar way—Earth’s gravity pulls them, and their speed keeps them from falling back to Earth.
Weightlessness
Weightlessness
Astronauts in a spacecraft orbiting Earth feel weightless because they are falling at the same speed as the spacecraft. Earth's gravity pulls the craft and its occupants downward at the same rate.
Gravity is the attractive pull between any two objects.
Gravity is the attractive pull between any two objects.
Gravity is a force. Gravity makes objects fall.
Gravity causes a roller coaster car to roll from the top of its lift hill. Gravity keeps the moon in orbit around Earth. Gravity keeps the planets in orbit around our sun.
Gravity causes a roller coaster car to roll from the top of its lift hill. Gravity keeps the moon in orbit around Earth. Gravity keeps the planets in orbit around our sun.
Aristotle was wrong.
All objects have gravity.
All objects have gravity.
Aristotle incorrectly believed that a heavy object would fall faster than a lighter one. However, Galileo proved that all objects accelerate the same in the absence of air.
Galileo was right.
Isaac Newton
Isaac Newton said that Gravitational Force depends on the mass of objects and the distance between them!
Bigger objects exert more gravity than smaller ones.
Scientific Law = a mathematical way of understanding reality. The following equation is used to calculate the force of gravity between objects.
Isaac Newton (Still)
Isaac Newton (Still)
Newton's Law of Universal Gravitation =
"Any two bodies in the universe attract each other with a force that is directly proportional to their masses and inversely proportional to the square of their distance apart.”
Isaac Newton vs. Albert Einstein!
Isaac Newton vs. Albert Einstein!
Isaac Newton
Isaac Newton
Newton said that gravity comes from objects with mass. Everything with mass has gravity, and bigger objects have more gravity.
In the picture above, you can see that the Earth pulls on the Moon with gravity, and the Moon also pulls back on the Earth with the same amount of force. This shows Newton's 3rd Law, which says that for every action, there is an equal and opposite reaction.
Albert Einstein
Albert Einstein
Einstein said that gravity is not actually a force! Instead, gravity happens when an object with mass, like a planet or a star, bends or curves the space around it. This bending, or curvature, makes other objects move as if they are being pulled towards the larger object. According to Einstein's theory of general relativity, this is why objects like planets orbit around the sun or why things fall to the ground on Earth.
See the picture above to help you understand how space is curved by mass.
Black Hole Videos
Black Hole Videos
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