Physics Stack Exchange
Physics Stack Exchange

Questions tagged [adhesion]

89 questions
111
votes
4 answers

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?
Ambrose Swasey
  • 4,534
  • 6
  • 32
  • 65
21
votes
2 answers

Why does sand stick to my shoes?

Well, that's easy: the sand is wet, and my shoes are wet, and hydrogen bonding adheres the wet sand to my wet feet and to my shoes. But then I walk home, and my shoes dry, and the sand on them dries, and some of the sand falls off. But some does…
Mark Dominus
  • 2,727
18
votes
3 answers

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 down? This would certainly cause more resistance…
CPlus
  • 1,096
18
votes
1 answer

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 were stuck to the inside glass walls but only in…
kamilazdybal
  • 273
11
votes
3 answers

Force problem related to adhesive and bonding

I have two PCBs (Printed Circuit Boards), and they are glued by adhesives, as shown in the pictures. The location of the adhesives is indicated in the picture (please notice that no adhesive is applied between the PCBs). A $50 \ \text{N}$ force is…
Delay No More
  • 115
11
votes
4 answers

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 between the wall and snake, the snake should then be…
Kampann
  • 141
10
votes
7 answers

Can we "pick up" an absolutely smooth cone off the ground?

I came up with the following problem: imagine an absolutely smooth cone with its circular face in contact with the ground. Is it possible to pick it up? Here are the detailed requirements: The cone is an even rigid body; Do not exert forces…
youthdoo
  • 319
10
votes
5 answers

A cup of water in ZERO gravity

What will happen if I try to pour a cup of water in zero gravity, into another empty cup? Will the water come out of the cup? The adhesive force between the water molecules and the interior of the cup should prevent the water from coming out. Is it…
Vinit Shandilya
  • 359
9
votes
0 answers

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 together, but are there other factors? What…
Gnubie
  • 1,919
7
votes
2 answers

Any research on Veritasium's hydrodynamic levitation?

So this Youtube video has been around for a while now Veritasium Hydrodynamic levitation! (2017). Also these questions Fluid Mechanics explanation of an object levitated next to an air jet and Explain hydrodynamic Levitation may be…
Mauricio
  • 6,886
6
votes
3 answers

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 (all of equal mass and size), and I move the…
MaximusIdeal
  • 8,868
6
votes
1 answer

How does glue work on the atomic level?

Glue seems to hold together almost all solid things. But on the atomic level, if two things have the same charge they tend to repel. So is it possible to charge glue and a solid with a charge? And if possible, will they then repel as they are of…
Bej
  • 453
5
votes
1 answer

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 gravity, which points directly downwards. Assuming…
Book Book Book
  • 103
5
votes
1 answer

Why is the no-slip condition not applicable for rarefied gases?

It is written in Wikipedia that at very low pressures the no-slip condition does not hold and there we are given a model for applications though there is no explanation given for the reason this is the case. Specifically, adhesion and cohesion are…
Elruz Rahimli
  • 137
  • 1
  • 2
  • 9
5
votes
2 answers

Why is Sticking to Glass a Lower Energy State for Water?

I've recently been seeing a lot of questions about why, when water is poured from a cup, some will dribble down the side. The best answer I've seen so far is that water is in a lower energy state when it adheres to a solid, but how exactly is it a…
Ulthran
  • 369
  • 1
  • 3
  • 14
1
2 3 4 5 6