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Let's take a look at this player's question from Pingpong.com today:
Hello, wet dad, coaches often say that when ball is enlarged, it must first be hit and then rubbed. What is purpose of doing this? Should amateurs do this?
1. The big ball affects game
In process of reforming table tennis, people over 40 still influence game.
Looking at first 38mm celluloid table tennis games, attack speed was so fast that ball couldn't even be seen clearly.
40+ refers to balls with a diameter of 40 to 40.5 mm. If diameter is increased, speed and rotation will be greatly reduced.
I played at a sports fair with this 50mm ball. This ball is very slow, spin is not very strong when pulled, but it is difficult to catch.
Because bigger ball, larger area it touches racket, so spin of ball will be easier to perceive, although ball doesn't seem to spin too much.
Second, relationship between impact and friction
When playing with more than 40 balls made of new materials, you must first hit ball carefully, as some professional coaches say, first hit and then rub.
(1) Rotation scoring is difficult
Hitting is about actively colliding with ball to apply force, instead of just rubbing ball and rubbing it thinly, because now clean wiping has no quality, and there is no way to directly control opponent through a change in spin. like before.
(2) Difficult to achieve quality at expense of speed
For a 38mm ball, a serve or a sneak attack will be more effective.
After changing to 40+, side attack not only cannot reach the quality of 38mm, but also affects recovery. The front gap is too large.
(3) Coexistence of impact and friction
Now it is necessary to pay attention to complexity of technique, to try to balance technical level of right and left shots, and to ensure friction in process of increasing penetration force of ball.
Impact and friction are two inseparable factors. The impact of ball can also create friction because force cannot be 100% through center of ball and there must be some deflection. As long as it deviates from rotation of center of ball will occur in direction of force, so friction can be created during penetration of force.
For example, when forehand rushes forward, it is necessary to actively penetrate ball, but it does not go completely through center of ball. curvilinear friction occurs on surface of ball. The swing is a curve, not a curve. It is not linear, it is equivalent to rolling racket changing shape at edge of sphere, such as first standing up and then pushing forward, this is equivalent to rapidly rubbing against surface of sphere, which means applying forces to penetrate this kind of racket. If you can feel friction generated at bottom, ball pulled in this way has both speed and spin, and quality will be higher.
The difference between three, 40 and 40+ balls
For average amateur golfer, 40mm and 40+ balls don't have much of an effect on them, and balls that aren't sure they'll go forward still have to be pulled and turned to ensure spawn speed.
Only for professional athletes, a backspin ball that is not particularly strong can usually be blown up because force can hold back ball's spin. This is only on condition that explosive power is good enough and feeling is good. enough.
For amateur players, it is still necessary to first ensure attendance rate, provide friction, and then improve quality, because friction is a prerequisite for ensuring attendance rate.
That's all for today's answer, and you can ask questions in questions section of Pingpong.com.
Ping-pong network organized by Liu Baosheng
November 07, 2023