Kinematics Equations (2 Problems)

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Homework Help Overview

The discussion revolves around kinematic equations, specifically addressing the implications of negative acceleration on the displacement variable x. Participants are exploring whether negative acceleration necessarily indicates a negative displacement and the relationship between acceleration and deceleration.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are questioning the definitions of displacement and acceleration, with some suggesting that negative acceleration does not inherently mean negative displacement. There is also a discussion about the clarity of the problem statement and the terms used in the textbook.

Discussion Status

The discussion is ongoing, with various interpretations being explored. Some participants have offered insights into the relationship between displacement and acceleration, while others express uncertainty about the terminology used in the problem. There is no explicit consensus yet.

Contextual Notes

Participants note that the problem statement is vague, leading to confusion about the definitions of terms like displacement and acceleration. The context of the homework and the textbook's clarity are also under scrutiny.

Johnny_07
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Homework Statement



In solving a kinematic equation for x, which has a negative acceleration, is x necessarily negative?

A classmate states that a negative acceleration always means that a moving object decelerating. Is this statement true? Explain.

Homework Equations





The Attempt at a Solution

 
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Johnny_07 said:

Homework Statement



In solving a kinematic equation for x, which has a negative acceleration, is x necessarily negative?

A classmate states that a negative acceleration always means that a moving object decelerating. Is this statement true? Explain.

Homework Equations


The Attempt at a Solution


No, depends on reference. You can say gravity has a negative acceleration in the y prime, but a falling object is accelerating. The correct term is negative acceleration, not decelerating.

Note: I could be wrong.
 
Last edited:
Thanks for the help, but it's two problems in my book, and those are the exact words. So I don't know.
 
Johnny_07 said:
Thanks for the help, but it's two problems in my book, and those are the exact words. So I don't know.

For your first question, what is x? Is it displacement, velocity or what?
 
I have no idea. I believe it's displacement, if I'm not mistaken. My teacher and the textbook is really vague and not clear at all :(
 
Johnny_07 said:
I have no idea. I believe it's displacement, if I'm not mistaken. My teacher and the textbook is really vague and not clear at all :(

Haha! I know how that is...

The answer is NO. This is because x could have a positive displacement and could also have a negative acceleration (slowing down) at the same time. Example, you roll a ball on the floor. It moves away from you (positive displacement) but is also slowing down (negative acceleration).

Again, I could be wrong, I'm only in last year of high school physics.
 
Alright, I'll take that into consideration.
Thanks a lot again! :) Really helped!
 

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