PART-2
✍it is not possible to tell which object is moving because in absence of a force ,all objects will continue moving in the same direction with the same speed forever. objects slow down here on earth because of force from friction and air resistance.
Einstein theory of Relativity is based on two principle
1st: is not possible to tell which object is moving and which object is standing still.
2nd:the speed of light is the same for all observers.
🙎♂suppose that Adam fires a laser at ground which bounces of a mirror, and Adam measures the time it takes for the light to return to the spaceship.
From Adam's perspective of view the laser goes straight up and down.
From Sarah's perspective of view the laser light follows
V shape path. Since the speed of light is the same for all observers from Sarah's perspective it takes a longer amount of time for laser light to return to the spaceship. If Sarah looks at Adam's clock she will see that Adam's clock read less time in between when he fired the laser ,and when he received the reflect light back. This means Sarah will see Adam's clock running slower than her own clock.
✍The closer spaceship approaches the speed of light ,the slower the time inside the ship will flow. If speed of spaceship was equal to the speed of light ,then the time time inside the ship would stop altogether. No matter how fast spaceship travels,Adam will never notice that time for him is going slower. Everything is slower by the exact the same amount, including speed of his thought,so time for Adam appears to be flowing normally.
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@AstrobiochemphyM Part 3 coming soon...