Sign of gravity in free fall | Motion in a straight line | Physics | Khan Academy
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Жыл бұрынIs gravity positive or negative in free fall?
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Created by Vibhor Pandey
@user-jj1wo7dm6x 4 ай бұрын
Thank you 👍🏼😊
@user-yb4ds2cn2s 4 ай бұрын
What decides the direction you take as positive
@user-gg9um1ow4e Ай бұрын
The direction you want throw if opposite - upward SMILALERY opposite😮
@davidatlee2498 Ай бұрын
Like the man said, it's tradition! We take down to be negative because the negative y-axis points down on a graph. If you flip ALL the signs of positions, velocities, and accelerations in a freefall problem, you will get consistent answers with the correct falling times and such. It's then your job to realize that a positive velocity means moving down. That said, I don't recommend this, because it's likely to confuse both you and your teacher.
@Fateymaa Жыл бұрын
Conclusion: Sign of gravity in free fall has no significance. It just shows represents which direction the mass is moving. Right?
@davidatlee2498 Ай бұрын
No, this is exactly the wrong interpretation. Gravity always points down, regardless of which way the mass is moving. We traditionally take down to have a negative sign, so gravity is usually taken to be negative. The velocity of the mass may be positive (going up) or negative (going down) without affecting the direction of gravity. The alternative would be quite surprising. You don't expect that gravity pulls upward on a ball so long as it's moving upward, after all.
@crazyr8496 Жыл бұрын
Sir if we have a question that acceleration is always _______ for free falling body . What would be the answer A positive B negative C zero D none
@skypinkeducationyt 11 ай бұрын
negative
@dramabuggy_8488 10 ай бұрын
Why ??? Negative
@skypinkeducationyt 10 ай бұрын
@@dramabuggy_8488 because acceleration always happens in the direction of force and earth apply force in backward direction in free fall
@crazyr8496 10 ай бұрын
@@dramabuggy_8488 any vector whose direction is opposite to direction of initial velocity has -ve sign
@dramabuggy_8488 10 ай бұрын
Of we drop ball from building so it's a free fall so here acceleration is positive bcz velocity inc and acceleration downward so positive ..am I right??
@swastikmishra4770 Жыл бұрын
🥇1st
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