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Questions tagged [adhesion]

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11 votes
2 answers
1k views

Force problem related to adhesive and bonding

I have two PCBs (printed circuit board), and they are glued by adhesives, as show in the pictures. And the location of the adhesives are indicated on the picture (please notice that NO adhesive is ...
2 votes
1 answer
57 views

Velocity Needed For Water To Overcome Adhesion Force To A Rounded Steel Inclined Plane

Context: I work at a fast food restaurant with a 3-module sink. The sides are slightly angled down to allow the water to trickle down into the compartments. I found that water clings to the side of ...
0 votes
1 answer
39 views

What happens when we apply the exact same pulling force as bonding force of glue? [closed]

Suppose we have two things stuck together with a glue which takes anything above $50 \,\text{N}$ of force to get it to get rid of the sticking force and anything below $50 \,\text{N}$ making no impact ...
0 votes
0 answers
22 views

What exactly are cohesive and adhesive forces?

Are cohesive and adhesive forces defined only when at least one of the interacting materials is a fluid?
12 votes
4 answers
4k views

How does a snake climb the wall?

Consider a snake climbing up the wall or ant climbing up the wall, which force is responsible for it? An obvious answer is frictional force but my question is that if there is a normal reaction ...
1 vote
1 answer
294 views

Why is my window condensation pattern like this?

There is a condensation-free area that is shaped like $3/4$ of a bell curve. I’m guessing warm air is leaking to the inside, on the bottom, below crest, and also adhering to the edges, preventing ...
1 vote
0 answers
43 views

Spoon with Marmalade in Space [closed]

I sit in a space shuttle in zero gravity condition. I have a spoon in one hand and the jar of marmalade in the other. I take marmalade with spoon. If I shake it very hard, will the marmalade detach ...
1 vote
0 answers
15 views

How to implement Macro-scale dyanmics simulation with adhesive and cohesive failure?

It's my first question here about physics. I would like to ask about the macro-scale physics (the governing equation) needed to implement a dynamics simulator with adhesion and cohesion. Consider the ...
2 votes
1 answer
59 views

Water traveling on a letter in a water feature

Difficult for me to ask as I'm not a physicist. Assume you have a water feature in the form of a waterfall where the water runs down a wall. On this wall, there are letters attached by a raised ...
5 votes
3 answers
630 views

What is the result of this Newton's cradle experiment where the initial ball doesn't bounce (exactly as in the regular case) but it has glue on it?

I have a question about a Newton's cradle type collision, but it has a twist to it. First, I will describe two well-known results, and then I'll add my twist. First, consider a cradle with five balls (...
1 vote
1 answer
100 views

Gravity vs adhesion of a water droplet

How much volume can a water droplet that is attached to a vertical glass surface have before it begins to roll downwards?
0 votes
2 answers
380 views

Stiction, friction and sticking

If we have two flat surfaces touching each other and apply a force parallel to the surfaces, one may move relative to the other. An example would be a polymer block gliding on another. Dependent on ...
-1 votes
2 answers
275 views

FBD with a system with glue

I am trying to understand how Adhesives or glues work. In the process I started thinking of drawing the Free body diagram. What will the FBD look like for the Blocks A, B and the adhesive itself? (I ...
18 votes
3 answers
3k views

Would an adhesive surface have more air resistance?

Imagine spreading double-sticky tape all over the surface of a car or a plane. Would there more significantly more aerodynamic drag as a result of the adhesive 'sticking' to air molecules and slowing ...
0 votes
1 answer
93 views

What is the minimum vertical length of contact with the wall needed for an object to stay attached to a wall with an electrostatic force?

Say there's an object, a rectangular prism, that becomes electrically charged and then stuck on a wall using the electrostatic attraction between the object and the wall. The object and wall are ...

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