The suction cup may not be sticking because there could be air trapped underneath it, the surface may be dirty or uneven, or the suction cup itself may be damaged or not creating a proper seal.
Cut a potato, rub the juice on the suction cup. This really does work. I don't know why.
Anything that needs sticking and re-sticking! For example, you can glue a patch of Velcro to your GPS and another to your car, and you won't ever have to worry about the little suction cup falling off.
Yes, a suction cup would not work in a vacuum because there is no air pressure to create the necessary force for the suction cup to adhere to a surface. Without air pressure to push against, the suction cup cannot create the vacuum required to stay attached.
Wetting a suction cup helps create a better seal and improves suction power. The water acts as a lubricant and removes air pockets, allowing the suction cup to adhere more effectively to the surface.
mounting cup
because you are pushing air out of the space between the window and the suction cup
I wouldn't want my last suction cup to slip, just as I reach the top of the window. The geckos have a very clever suction cup design of the soles of their feet.
The suction cup won't stick to the surface because there may be air trapped between the cup and the surface, preventing a vacuum seal from forming. This lack of suction makes it difficult for the cup to adhere securely.
To securely attach an object to a rough surface using a suction cup, first clean the surface and the suction cup thoroughly. Apply a small amount of petroleum jelly or water to the rim of the suction cup to create a better seal. Press the suction cup firmly onto the surface and make sure it is securely attached before placing the object on it.
A suction cup sticks to a window because the air inside the cup is removed, creating a partial vacuum. This difference in air pressure between the inside of the cup and the outside atmosphere creates a force that holds the cup in place against the window.
To remove a suction cup, gently pull one side to release the seal created against the surface. Avoid pulling too forcefully to prevent damaging the suction cup or the surface it is attached to. If necessary, you can also use a blunt object to help pry the suction cup away from the surface.
The suction cup will lose its attachment, unless it has an additional adhesive. Suction cups attached to a surface are held there by the pressure of the outside air, which is higher than the pressure under the cup. The suction cup is trying to return to its uncompressed condition, and pulls away from the surface, reducing the pressure under it.