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This experiment spectacularly showed how relative speed works.

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[-] ReluctantMuskrat@lemmy.world 1 points 1 week ago

He's actually rapidly decelerating. It's like slamming on the brakes and coming to a stop, but backwards.

[-] Evil_Shrubbery@thelemmy.club 2 points 1 week ago

He is facing backwards so if you are differentiating between acceleration & deceleration then he was accelerated bcs he was facing the same way we the vector.

[-] ReluctantMuskrat@lemmy.world 2 points 1 week ago* (last edited 1 week ago)

Which way he's facing makes no difference. Relative to the ground, by which we are measuring his speed and on which he comes to rest, he is decelerating. Just as a seat belt presses against your waste and chest to decelerate you when braking hard, the chair he's sitting in is doing the same, but against his entire back.

I will however agree relative to the moving vehicle he is accelerating in the opposite direction of motion, but that not the frame of reference by which we've documented his moving velocity.

[-] BanMe@lemmy.world 2 points 1 week ago

The question is what it would FEEL like, not the technical physics.

[-] Evil_Shrubbery@thelemmy.club 1 points 1 week ago

Exactly.
Otherwise he might not have been accelerating at all compared to a meteor on the other side of the galaxy (by pure chance).

[-] Evil_Shrubbery@thelemmy.club 2 points 1 week ago

Acceleration is a vector with magnitude and direction.

this post was submitted on 16 Feb 2026
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