Monday, March 23, 2015

This Tennis Act Disproves Physics?!

Since when?!

Why is it that when some "morons" see something that they can't comprehend, they always claim that it violates physics, or can't be explained by physics, as IF they understand physics well-enough to make such judgement? I mean, c'mon!

This is the case here where this writer claims that Novak Djokovic ability to stop the ball coming at him with his racket somehow defy physics and turning it all into "a lie". (

Look, I know this is written probably in jest, and probably without giving it a second thought, but such stupid comments of journalism should really be stopped and called out. There's nothing that can't be explained here by physics. If Djokovic had held the racket with a stiff arm, he would not have been able to stop the ball the way he did. In fact, it would have bounced off the racket. But look at how he stopped it. He moved his arm back to "absorb" the impact, basically allowing the strings to absorb the momentum of the ball. This is called "Impulse", where the force on the ball to change its momentum to zero is spread out over a longer period of time. Thus, the force needed to slow it down is small enough that it doesn't cause it to bounce off the strings.

In other words, what is observed can easily be explained by physics!

BTW, Martina Navratilova had done this same thing a few times while she was an active player. I've witness her doing this at least twice during matches. So it is not as if this is anything new. Not only that, although it is less spectacular and easier to do, badminton players do such a thing numerous times as well when they are trying to catch a shuttlecock.


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