Forces on a Window: 3 Suction Cups & Normal Force

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Homework Help Overview

The discussion revolves around analyzing the forces acting on a window that has three suction cups applied to it. Participants are trying to understand the role of the normal force in relation to other forces, such as gravitational and frictional forces, in this context.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants are questioning the placement and role of the normal force (Fn) in relation to the gravitational force (Fg) and frictional forces. There are inquiries about the direction of forces and whether the window is in static equilibrium. Some are seeking clarification on the nature of the forces acting on the window and how they interact.

Discussion Status

The discussion is ongoing, with participants actively asking questions and seeking clarification about the forces involved. Some have provided insights into the direction of forces and the need for additional diagrams to better understand the situation. There is no explicit consensus yet, but the conversation is productive.

Contextual Notes

Participants are working with a scenario that involves multiple forces acting on a window, including gravitational force, frictional force, and the forces exerted by the suction cups. There is uncertainty regarding the static or dynamic state of the window and the complete representation of forces in the provided diagrams.

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Homework Statement



Draw the forces on a window

The scenario is that I have 3 suction cups on the window to tale it down. And i don't know where the "normalforce" is. I forgot to draw the force of the suction cups

Homework Equations

The Attempt at a Solution



z8jtzqH.jpg
 
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Hi,

The suction cups must be located somewhere. Also, I find it hard to believe the Fn and Ff working lines in your sketch. Please elaborate ...
 
Does Fn hav to be opposite of Fg?
 
Opposite meaning working on the left pane if the other is working on the right pane ? Or do they grab along the same line ? Or are there more than one friction forces aat work ?

From the picture I can't see if the window is in static equilibrium or if it's crashing down with thunderous speed (probably the former :smile:)
 
It is not supposed to move. If I look out of my bedroom window there is a downward force (Fg) and a upward force which is the friction. The window has suction cups om the outside to try to remove the window. So there is also a force outside cus someones is pulling. So i am wondering where Fn is. It must be opposite of the pulling force right?
 
Sorry to have still more questions, but I can't form a complete picture yet:

which way is the someone outside pulling ? Can you post a more complete picture ? Is it sensible to also draw a side view, or are all forces verical ?
 
http://imgur.com/a/p9SU3
http://imgur.com/a/p9SU3

Here are the pictures. Fg is down and the friction force is up. Outside there are three things stuck on thw window so they can pull it out. So i am wondering where Fn is
 
Found a window picture:

window1-detail.jpg

If you pull on the suction cups in an outward direction, that is a horizontal force. The jambs provide the normal force . So a side view is indicated !

Friction force is up, you say. How do you know ? And is it offsetting Fg completely ?
 

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