Torpedo bats and the physics of the sweet place

If the ball hits the stick and bounces back, what will happen to the stick? If you said the rod will pull back to the right, you are right. We can think about it as a collision. When two sites collide, they exercise strength on top of each other. And Newton, the forces are equal and opposite, maintaining the overall inertia of the ball ball system constant. We define inertia as a product of the mass and the speed of the site.

As the ball bounces back, the only way to keep the inertia is to step away. (I know my setup for this thought experiment would make a pretty lame viewer sport, but stay with me – this will help us understand what is happening in the sweet place).

Out of the center collision

Okay, go to extract the stick and return it to the starting position. The ball is fired again to the stick. This time, however, is directed to the end instead of in the middle. Like this:

The rod still pulls away to the right but now too rotate For his center, right? Why is this happening? Well, inertia is still preserved, but now there is another reserved amount – a lot of speed. Angular Momentum looks a lot like a simple old impulse, except that it deals with rotary motion instead of linear movement.

While the line impulse depends on the mass and speed of the site, the angular impulse is equal to the product at the angular velocity of the site and its inertial moment. The inertial moment is like a rotating mass – it depends not only on the mass of the site, but also how this mass is distributed. So, after the rod pulls away from the impact of the ball, it obviously has an angular inertia as it rotates.

But what can we say before the collision? The rod does not rotate and there is no angular impulse so that the angular impulse is preserved then ball There must be an angular impulse. Yes, the table may have an angular impulse, even if it does not rotate. (This is one of those moments when physics just seems strange.) The corner impulse of the ball depends on its linear impulse and where the stick hits.