Apparently not, or he wouldn't have asked. We have no idea how old this lad is, or what his level of education is.subodei said:the force of friction between the coin and the board is not great enough to overcome the inertia of the coin
I suppose he knew that though...?
As several have noted, the answer relates to the inertia of the coin. All objects that have mass require a force to get them moving (or change their state of motion). The only horizontal force on the coin is the friction between card and coin. If there were no friction, then you could slide the card away at any speed and the coin wouldn't move (until it started falling, of course).Aladin said:When we put a coin on a boardcard and both the boardcard and coin put on a glass.
when we hit the boardcard,why the coin drop down into the glass.??