The discussion revolves around understanding the signs of the vertical component (y) and the acceleration due to gravity (g) in kinematic equations. Participants explore how to determine when y and g should be considered positive or negative, particularly in the context of problem-solving in physics.
Participants do not reach a consensus on how to determine the signs of y and g, with multiple competing views presented regarding the interpretation and application of these signs in kinematic equations.
There are limitations in the discussion regarding assumptions about coordinate systems and the definitions of positive and negative directions, which are not universally agreed upon.
There's no way to figure it out. It's your choice! Gravity is always directed towards the Earth - there is no choice about that.bluesteels said:Summary:: i was doing some problem and i have a hard time figuring out when will the y be positive and negative and same with the gravity idk if it -9.8 or 9.8
i was doing some problem and i have a hard time figuring out when will the y be positive and negative and same with the gravity idk if it -9.8 or 9.8
Most textbooks would already insert the minus sign in the latter case, so you would still replace g with 9.8.anuttarasammyak said:If +y has same direction with gravity, it is 9.8.
If +y has opposite direction with gravity, it is -9.8.
Every rextbook does it differently. You would need to look at the relevant chapters and read some of the worked examples.bluesteels said:Summary:: i was doing some problem and i have a hard time figuring out when will the y be positive and negative and same with the gravity idk if it -9.8 or 9.8
i was doing some problem and i have a hard time figuring out when will the y be positive and negative and same with the gravity idk if it -9.8 or 9.8