Because a serve hits the net.
Do you mean "let"? If so, a let is when a serve touches/nicks the net AND lands in on a player's serve. People call "let" so the server knows their serve hit the net. If a server hits a let, they get to redo their serve.
Yes
There are no 'faults' in tabletennis. If you miss the first serve, you lose the point. However, having said that, if you serve a "let" - where the ball plays truly on each side of the net, but touches the net in its travels across the net, you are permitted to retake your serve to make it a 'clean' serve that does not touch the net.
If it hits the net and goes into the service box, you get one re-serve (as opposed to getting two re-serves if you do that on your first serve). If it hits the net and does not land in the service box, then it is a double fault.
The opposition get a point for a double fault
It is called a "let" in tennis when the ball hits the net because "Filet" is the French word for net and the game originated in France.
It is called a letThe server gets to reserve the serve that was a let
Of course! As long as it doesn't hit the net and then go over, it's fine.
The ball loses 50% of its speed by the time it reaches the net.
Let is when the ball goes over the net and lands inside the box but hits the net going over, Let is only on a serve. Net is when the ball hits the net and fails to go get over the net.
The tennis ball is sized and constructed to work with the tennis rackets. It is pretty much essential because its handling determines the scoring. Without a ball, you cannot have a legal serve. If you do serve an imaginary ball, the first volley will go on forever, with spectacular recovery shots made on both sides of the net.