00:00The force that holds everything together. The first experience of gravity. Think about dropping a stone. It always falls down.
00:07This simple observation is our first experience of gravity.
00:11Gravity is the invisible force that pulls everything toward the earth.
00:15It is the reason we can walk, rivers flow, and thrown objects come back down.
00:20Newton and the falling apple!
00:22The famous story goes that Isaac Newton saw an apple fall from a tree and wondered if the apple falls to the ground,
00:28why doesn't the moon...
00:30This thought led to the law of universal gravitation.
00:33Newton explained that the same force pulling the apple downward also keeps the moon orbiting earth.
00:38Gravity is universal, working everywhere in the cosmos.
00:43Universal gravitation. Everything pulls everything. Gravity is not limited to earth and objects.
00:48Every mass attracts every other mass.
00:51Two small stones also pull each other, though the force is too tiny to notice.
00:56Massive objects like planets and stars have enormous gravitational pull, shaping orbits and cosmic structures.
01:03Gravity in everyday life. Our feet stay on the ground because of gravity.
01:07Water flows downward in rivers.
01:09Buildings, trees, and mountains remain firmly on earth.
01:15Without gravity, everything would float in the air.
01:19Gravity is the unseen glue that holds the world in balance.
01:24Planets and orbits.
01:26Cosmic dance of gravity.
01:27Gravity doesn't just keep us on earth.
01:29It organizes the solar system.
01:31Earth orbits the sun because of the sun's gravity.
01:35The moon revolves around earth.
01:37Satellites remain in orbit because they are constantly falling toward earth, but moving forward fast enough to miss it.
01:43This creates a perfect cosmic dance.
01:46Tides, the moon, and sun's influence ocean.
01:52Tides are a visible proof of gravity.
01:55The moon's gravity pulls water, causing high and low tides.
02:00The sun's gravity also contributes.
02:03Together, they create rhythmic ocean movements.
02:06Mask versus weight.
02:09Mass is the amount of matter in an object.
02:12Weight is the force of gravity acting on that mass.
02:15On the moon, your mass stays the same, but your weight decreases due to weaker gravity.
02:21This is why astronauts can jump higher on the moon.
02:23Zero gravity.
02:24Truth and misconception.
02:26Astronauts floating in space often appear weightless.
02:30Gravity is still present, but they are in continuous freefall around earth while moving forward fast enough to stay in orbit.
02:36Hence, the illusion of zero gravity.
02:40Black holes.
02:41Gravity at its extreme when a massive star collapses under its own gravity.
02:46It can form a black hole.
02:48Its gravitational pull is so strong that even light cannot escape.
02:52This is the most extreme form of gravity in the universe.
02:57Why gravitation matters when it is.
03:00Without gravity, planets wouldn't orbit stars.
03:04Atmosphere wouldn't cling to earth, making life impossible.
03:08Oceans and rivers would not exist.
03:11The universe would be chaotic without structure.
03:15Gravitation is the invisible architect of the universe, shaping galaxies, stars, planets, and life on earth.
03:23Matrix, amazingly int ou stable.
03:24Human is the ors.
03:25Truth and
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