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Anonymous users2024-01-23Why is it low when a ping pong ball falls on the sofa and jumps. It's because the sofa is soft, and the ping pong ball has no pull back when it falls on it, so it can't jump.
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Anonymous users2024-01-22The table tennis ball is elastic, and after falling to the ground, it gives the ground an impact force, and the ground gives the table tennis ball a reaction force, and this reaction force pushes the table tennis ball upward, and the table tennis ball will jump up.
But if the sofa is soft, this reaction force will be small, and it will not be easy to jump.
Because people always sit on the couch, the dog sees and wants to imitate.
Some kind of bird, but it's obviously unreal, and I can't see any species.
1. Vibration to make the originally attached dust leave. Second, the air flow, because the sponge of the sofa contains air, when the shot is compressed, the dust is blown out. Do you see that?
Of the three, agree with Tian Tian's opinion, the distance between the stairs and the single sofa has nothing to do with it. It was the staircase one level above, and it had no effect on the sofa.
Water is going through the digestive tract in the body, and this happens to everyone when they drink more water and wear less clothes in summer.