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### 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 ...
• 21
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 ...
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?
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 ...
• 151
1 vote
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 ...
• 111
1 vote
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 ...
611 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 (...
• 8,578
1 vote
95 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?
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 ...
• 946
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 ...
• 117
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 ...
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131 views

### Strange occurrence of glue drying

What happened here? I by accident spilled super glue and formed these amazing ridge patterns. Any ideas what caused this to happen?
• 41
125 views

### Why do wet napkins stick to mirrors or glass?

Take a dry piece of napkin & put it against a mirror ==> it falls down. Dab it in water, oil, or alcohol ==> it now sticks / adheres to the mirror. How can we explain this in physics terms? ...
• 196
53 views

### If friction and normal force are both the components of contact force, shouldn't the friction be repulsive?

Is friction due to intermolecular attractive forces or repulsive ones. Since both friction and normal force are the components of contact forces, shouldn't friction be repulsive.
49 views

### How does a plate stick to a tablemat?

So at my dinner table, I witness this weird phenomenon almost everday. A wet plate if placed on the table mat sticks to it(works better if the plate is made up of steel). I account surface tension and ...
• 229
1 vote
654 views

### What makes silicone sticky?

I've read from 3M's Adhesion Science articles and this StackExchange question that there are three types of adhesion: chemical, physical, and electrostatic. I'm curious about what makes silicone ...
• 11
1 vote
17 views

### How do I quantify an adhesive's ability to stick in contrast to flow?

Let's say you glue a ball to a shovel. How do you quantify this adhesive's and ball's ability to stick to the shovel, moving at different speeds, in air and then while the shovel digs into the ground? ...
• 203
29 views

### Effect of adhesive on ballistic fabrics

Adhesive is applied to "soft" ballistic fabrics (like kevlar or even fiberglass) in order to decrease bulge when being hit by a projectile. What would be the effect of gluing layers of ...
44 views

### How to transform from a discrete to integral equation?

In this picture, the red curve is an elastic rod that has resistance to bending and extension. I am trying to model the adhesions (contact) between the rod and the substrate (glass): the green dashed ...
• 231
36 views

### Why does cold icing slide off a warm cake?

As in the title: why does cold icing slide off a warm cake? I've been told that it's because a thin layer at the bottom of the mass of icing interacting with the surface of the cake melts to some ...
213 views

### What are the sealing adhesives for high vacuum system?

Recently, I have a project that needs to use a high vacuum system. During the construction process, I encountered a problem: I need to stick mica or glass to the window of the copper wall (one side is ...
• 33
87 views

### Is Viscosity due to adhesive forces or cohesive?

So if a non-ideal fluid is in motion, in a siphon for instance, then I completely understand why viscosity could arise due to cohesive forces between the particles. But let's say we drop a metal ...
37 views

### Why I require more force to slide covered notebooks over each other with water between them although water work as lubricant?

We have learnt when floor is wet we get slip as it reduce friction and work as an lubricant. But yesterday I take 2 notebooks which are covered by transparent sheet , than I pour little water on one ...
1 vote
56 views

### Max allowed size of the pores that would prevent a viscous fluid to pass through

Let us have the following system where we put a viscous fluid from the upper inlet and we want this fluid NOT to enter the lower chamber thanks to adhesion & cohesive forces. What is the max. ...
• 2,283
1 vote
660 views

### Why does water follow the spoon's surface?

Why does water follow the spoon's surface? Is the reason surface tension, viscosity effects, a pressure gradient?
• 613
115 views

### Is increased paint adhesion after sanding the result of extra surface area?

Often surfaces are sanded before painting to increase adhesion of paint to the surface. I have never seen an explanation as to why this actually results in much stronger adhesion of paint to the ...
365 views

### What forces act on a droplets hanging from surfaces?

What are the different forces acting on a hanging water droplet (tension of the droplet itself, surface adhesive forces, meniscus formation, etc)? What is the direction of each force, and how does ...
190 views

### Why does an elastic tape peel off neatly when stretched?

There is this video about a tape peeling trick trending on the internet. If you have a tape sticking on a paper, it rips off the paper if you perpendicularly pull on the tape. But when you stretch the ...
• 12.3k
1 vote
30 views

### What is the change if a droplet of water is added to another droplet of water on a flat surface

There is a tiny droplet of water lying on a flat clean surface and I add a droplet of water to the tiny droplet on the surface. How can I explain the change that might occur?
31 views

### What type of adhesion is at play when dust is collected by water

A washing tower that rains water down through a polluted gas will take up the particulates in the gas. They do this through adhesion, I'm pretty sure. Now, there's apparently 5 types of adhesion: ...
• 365
15 views

### Deformation and Adhesion with Particle Contact Time During Impact

Let's say I have a spherical particle impacting a large flat target (let's say it's a half space) at high velocity. It seems I can approximate contact time during impact by dividing impact velocity ...
234 views

### How exactly do vinyl "static" clings work?

My son asked me this question today, and for the life of me, I can't come up with a good answer that even convinces myself. Vinyl "static" clings are those decorative pieces of vinyl that ...
• 141
40 views

### Does: capillary_action * surface * distance = (force*surface) / area*distance == capillary_energy?

I'm trying to get the hang of the conservation of energy. Looking for that aha moment when it makes more sense that energy is conserved than not. When reading it seems to be a consensus that energy is ...
1 vote
153 views

### Avoiding snails around potted greenery

I am not sure how a snail "sticks" to surfaces e.g. plastic pot or stone. I suspect that it produces mucus, which then adheres with molecular forces. I would like to know, how does the ...
• 1,825
1 vote
289 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 ...
201 views

### Why does glue solidifies when taken out of the container?

When you take a small portion of an adhesive, it solidifies after some time while the other part in the container remains in liquid state. Why does this happen?
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358 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 ...
• 3,901
555 views

### Why does pepper not stick to the glass with print inside my pepper shaker?

So I have this pepper shaker made of glass with a print on it: One fine dinner, it ran out of pepper, so I opened the lid to fill it up and noticed a peculiar thing – small particles of pepper dust ...
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142 views

### Why does molten wax stick to surfaces when it soldifies?

In a candle, when wax is molten and cools after. It sticks to the glass surrounding it, why does this happen?
1k views

### Why don't these water droplets fall? Is it because of the surface tension of the water?

Why don't these water droplets fall? Is it because of the surface tension of water? Under the action of gravity, water tends to fall, so the pressure at the top of the water droplet is lower than ...
• 2,034
272 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 ...
• 823
1 vote
118 views

### Why can't I scotchtape ice?

I am thinking that the electrostatic force (Van der Waals force) should take effect when I try to tape an ice, but the tape slips. Why does this happen?
• 13k
555 views

### How to determine adhesive forces between fluid and a surface?

Disclaimer: I work in applied math and have limited background in Physics. Need a bit of help here. Assuming I have a 2D droplet attached to some surface like so: This droplet is also experiencing ...
52 views

### Energy dissipation and work of adherence force

Assume you are pushing a heavy item. But it's not moving. So there is no work, and there should also be no dissipation of energy $P=F v=0$, since the forces don't work. But we see that it does demand ...
• 482
838 views

### When does water decrease or increase friction?

Water often acts as a lubricant e.g. a wet floor or road, but sometimes the reverse happens e.g. putting on wet clothes. I understand that surface tension is involved e.g. microscope slides sticking ...
• 1,879
13k views

### Why does a sticker slowly peel off, but if it is pulled quickly it tears?

Anyone who has removed a sticker, knows that often they must be pulled off slowly, otherwise they tear. Why is this?
• 4,474
365 views

### Why is it easier to catch mosquitoes with your hand when your hand is wet?

Recently I've noticed that it's significantly easier for me to catch a mosquito with my hand if my hand is very wet (e.g. from having washed my hands and not yet dried them, or from being in the ...
1 vote
379 views

### Is a paste a type of glue?

I just wanted to know the answer to this because of the idea of phases of matter, would a paste (or glue) drying count as a change between the states of solid and liquid?
• 1,542
541 views

### When putting water on two pieces of paper they bond. Is that due to van der Waals bonds?

I've been wondering what keeps two pieces of wet paper together when in contact. Does water have any adhesive property? Or does it decompose something from the paper and creates some kind of glue? I ...
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