26 March 2014 #26March2014
At -9.8 m/s ² gravity's not gonna wait that long
@sharpscissors, it's not negative...
@877CashNow, it could be depending on what the problem is asking for.
@877CashNow, the cat would go downwards and down means negative
@Draven, no gravity can never push you away... At least not on earth.
@sharpscissors, and the factor of bś travels at 45/23 a second to the third power of Â lie
@877CashNow, as a vector it has to be negative to show that it's going downwards
@sharpscissors, gravity comes from the center of the earth which is down but it pulls you toward it at an acceleration of 9.81 meters per second squared. If it were negative you would be flying away. Look it up.
@sharpscissors, true, but relative to what? Technically you are both right.
@877CashNow, yeah but if the problem asks for how high can the cat jump, we would use negative to show acceleration of gravity pulling back down. Although this cat is not jumping.
@DividedAlliance, it's an acceleration... Which means if it were negative you would be going backwards.
@Draven, okay I see what you are saying, technically you would be measuring the gravity as a counter to the jump, but gravity itself will never be negative
@877CashNow, true, I'm taking honors physics in high school right now so I felt I had to contribute haha
@Draven, haha no more physics for me!! Yay!!
@877CashNow, I thought negative acceleration was slowing down
@sharpscissors, other big sciency words
@877CashNow, dividedalliance is correct. Here is why: while referring to a horizontal acceleration, left and right, it is important to note that left will be negative and right will be positive, left deemed to be "going backwards;" however, when in physics you refer to vertical motion, up being positive and down being negative, you must say negative for gravity since gravity always pushes down upon you. It makes sense, afterall have you ever heard a plane go up -100 meters?
@airguitarpro, Have you ever heard of going a negative distance in any direction? I just jogged -5 miles today. The plane went -100 meters down. A distance cannot be negative.
@Commandshark, thank you
@airguitarpro, No, first of all that is not how distance is measured. Second, gravity is a force of acceleration. If it were ever represented with a negative it would imply that the subject, in this case the cat, is fighting against it, by jumping.
@seanrhagen, you are the most correct person here and they ignored you. Relativity matters guys. Physics is no joke and numbers don't lie. With a reference point being the max point of the jump gravity would be going 'away' thus seeming positive. At the min point being the ground gravity would be accelerating the object towards it, the '0' and thus would seem negative. that being said acceleration has a direction period, as it exists purely as a vector and never as a scalar. In the formulas (most likely vectors or kinematics) you see the negative in front of acceleration only because it is in 'reference' to the effect on a velocity (slowing down or speeding up) to the point where it can reverse the direction the object initially went.
@Commandshark, A negative doesnt mean the same as it does in physics. If I gave you a problem that had one object moving up and one moving down, how would you be able to differentiate in terms of solving an equation? You use negative to refer to a direction. A negative can represent an opposing distance. For example a car moving at 30 mph to the left with an x Newton for collides with a car moving 40 mph to the right with a yNewton force and they stick together. If asked for to solve for certain things you would refer to the left as a negative number since they are not in the same direction. Sorry its late and i cant think of a solid example, i hope this clarified it for you.
@877CashNow, First, I must say that like seanrhagen has said and mathematician has also stated, it depends on the situation. For you to say gravity is never referred to as negative is incorrect. Second a negative in a lot of physics problems refers to different directions. Again, some questions asked need to differentiate between two different directions. A good example of this is inelastic and elastic collisions. While that doesnt really use gravity per say, the idea is still the same. In this picture, you are correct the negative is not really needed for gravity, but it isnt wrong, it is just stating the direction, but i feel that it is implied at this point.
@airguitarpro, you didn't use distance in your formula. You used Newtons (measurement of force not distance) and mph (imperial measurement *eww* for velocity, not distance) so... You solve for an acceleration not a distance ? Meaning you didn't even use 'negative distance' in your example.
@Commandshark, another problem is that you dont say "-100 meters DOWN" thats likes saying "down 100 meters down." A - is a quick way to say down or left (usually although it can me right if left is positive and up if down is positive in a problem or equation) think of them as a direction.
@airguitarpro, not trying to be a dick though, just saying you may wanna iterate a new example
@Mathematician, the mph can indicate a distance. I forgot to add a time, which is totally my fault, thanks for pointing that out friend! again, it is late and my physics is a bit rusty at the moment. I hope you can forgive me, have an upvote for catching that one.
@Mathematician, No, thank you for pointing it out. When having an argument it is important to show when someone isnt being clear enough or may be lacking information. This tends to happen when its late at night and I forget what I have said and have not said haha. But to summarize I agree with you the most. You said it in words I fail to possess at the moment. Well said good sir/madam.
@airguitarpro, yup i caught that at the end and figured it was just an error because of how late it is. No problem, i get what you're saying just didn't see it used correctly. In mathematics negative distances would be relative to a reference point (i.e train A and train B relative to a train station considered the 0) and the resulting calculations would involve seemingly 'negative distances' because you are in a zero sum game when it comes to collisions in mathematics!
@Mathematician, Yep! Also, upon looking up this conflicting question, I have been reassured that you can have a "negative" acceleration, velocity, distance, and force as I have thought as long as it is indicating direction. Direction is key next to relativity of course. Since you can have 2 of any of these being in different directions. This is especially true for forces and finding a net force which can be negative. Good to know that I remember a few things from my physics class haha. Goodnight friend! It was fun having a conversation with you!
@airguitarpro, indeed. I'm glad so many funnypics users have delved into the world of phun physics. I minored in physics in college and loved every course including quantum physics and astrophysics. Calculus based physics was the best though, the kind you will see in some advanced high school physics courses (beyond conceptual physics) when we had to draw diagrams of the calculations to best understand how to use the formulas at our disposal. I still wish real life were in a frictionless vacuum lol
@sharpscissors, I have come to the conclusion that I am not smart.
Morning after party
#you'rewel-- no, no, I'm better than this.
Gravity can't wait! You need to see it while it's still in theaters!
Time to shave the cat.
The purrrrrrrfect nap!