How Does Energy Conservation Affect Block Movement Near a Wall?

AI Thread Summary
Energy conservation principles indicate that a block's movement near a wall is influenced by the absence of friction, allowing it to travel a distance equal to its initial displacement. The discussion reveals confusion regarding the block's final position, particularly the assumption that it would move the same distance to the left of point A as it did to the right. A force of 18.8 N is mentioned, which is removed at point B, impacting the block's motion. Clarification is needed on the block's state at the wall, as it should not be assumed to be at rest. Understanding these dynamics is crucial for accurately determining how close the block approaches the wall.
AdkinsJr
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Homework Statement

problem.PNG


2. Homework Equations
Conservation Mechanical Energy

The Attempt at a Solution



I need to find how close to the wall the block will come. Since there's no friction, I presumed there'd be enough energy, and only enough energy, to go the same distance d to the left of A. Also note that d=-0.2m. This answer is incorrect however. I don't understand. [/B]
 
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AdkinsJr said:

Homework Statement

View attachment 196397

2. Homework Equations
Conservation Mechanical Energy

The Attempt at a Solution



I need to find how close to the wall the block will come. Since there's no friction, I presumed there'd be enough energy, and only enough energy, to go the same distance d to the left of A. Also note that d=-0.2m. This answer is incorrect however. I don't understand. [/B]
Why do you think that ##d =0.2m##?
 
PeroK said:
Why do you think that ##d =0.2m##?
This is given.
 
AdkinsJr said:
This is given.
What's this force of ##18.8 N## then?
 
Oh, I'm sorry I didn't realize something was missing. The force is taken away at point B.
 
AdkinsJr said:
Oh, I'm sorry I didn't realize something was missing. The force is taken away at point B.
Do not assume the block is at rest at that point.
 

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