- #1
Thomas12357
- 4
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In my "living room lab", I have observed that oblique collisions between a moving hand-held ping-pong paddle and a stationary ping-pong ball result in various post-collision angles of the ball with the plane of the paddle. The angle is determined by the orientation of the paddle to the hand and arm. I have experimented primarily with a 45 degree impact and with low uniform paddle speed of about 2 m/s. The paddle is moved horizontally in a straight line and its face is approximately perpendicular to the floor at impact. I am only looking at two dimensions, so that the angle of concern is the projection upon the plane of the floor.
Post-collision angles vary from normal to the paddle surface to half way between normal and the direction of movement, and sometimes closer to the direction than to the normal. Such large differences are observable with the eye and are fairly repeatable. Much care must be taken to keep the direction of the paddle and the angle the face makes to the floor constant. Obviously, refined analysis is not possible in the living room. Therefore, I am asking how the mass and torque of the arm and hand are causing this variation. For those of you who are not ping-pong players, let me say that the collision produces a great spin of the ball. Let me also say that perpendicular collisions always result in a normal post-collision angle.
I am a ping-pong player and recently modeled the flight of the ball. Now, I hope to do some modeling of the collision. Thank you, Thomas12357
Post-collision angles vary from normal to the paddle surface to half way between normal and the direction of movement, and sometimes closer to the direction than to the normal. Such large differences are observable with the eye and are fairly repeatable. Much care must be taken to keep the direction of the paddle and the angle the face makes to the floor constant. Obviously, refined analysis is not possible in the living room. Therefore, I am asking how the mass and torque of the arm and hand are causing this variation. For those of you who are not ping-pong players, let me say that the collision produces a great spin of the ball. Let me also say that perpendicular collisions always result in a normal post-collision angle.
I am a ping-pong player and recently modeled the flight of the ball. Now, I hope to do some modeling of the collision. Thank you, Thomas12357