Physics
Saturday, January 9, 2010 @ 7:31 PM
HiHi.
Had to create another blog cos i forgot my password.WTH-.-
Kay, anyw here are some questions that were asked during class.
1)Why does ice stick to your fingers?
Ice from the freezer is actually about -15 C. So, when it comes in contact with a moist surface, like your finger or tongue, the water instantly becomes frozen to the surface of the ice. This effect allows the ice to feel, "sticky." Once the ice warms up to about 0 degrees C, it is no longer sticky since the surface is starting to melt, leaving a layer of liquid between your finger and the ice.
2)Why won't the lift start when you wear gloves to touch the lift button(touch screen)?
The touch screen can detect the presence and location of a touch within the display area. When a person is wearing gloves made of an insulating material, the touch screen does not work.It is because heat from our fingers is sort of like something that "activates" the touch screen. If the gloves are made up of an insulating material, the heat from your fingers will not be able to pass through the gloves and the lift would not activate.