Now, the ball behaves more like you expect. Its horizontal speed is reduced, causing it to fall behind the original car. But this still won’t hit your windshield. With air resistance and energy loss in ground impacts, each bounce is a bit lower than before. You should be fine.
Rock
Now say, the child fell a rock out of the window. Children! Maybe there is a truck carrying gravel, some of which are sliding in the cracks. When a rock hits a road, its movement may change in several ways. First, there is friction between the rock and the road, which will reduce the horizontal speed of the rock. As we saw above, slower bad.
Secondly – this seems strange – because a rock is irregular in shape, it has the potential to rotate and hit the sidewalk in a way that makes it jump higher than it starts.
hold on! Isn’t this a violation of the law? Do you know, the law of energy protection? No, this is an energy Transfer. Rotating and moving rocks have rotating and translating (linear) kinetic energy. Some collisions can convert rotational energy into conversion energy, which will cause the rock to rebound higher. It is not good to be higher.
This is what it is possible:
So you’re cruising along the highway (for example, 70 miles per hour) and there’s a rock in the air at the top of the path. Rest for a while, but you are not. Let the court be aware: The rocks didn’t hit you. You hit the rock. But the effect is the same. Either way, you need a new windshield.
Rock
This is a reasonable situation, but what if you don’t have a truck in front of you? In fact, a more common cause of windshield damage is that a rock on the road was kicked by another car. You might think it was hit back to the car behind, but that’s not very correct. The rock still doesn’t move backwards.
Picture: The wheels roll along the road, and a rock wedges between the tire treads. When the rock comes into contact with the ground, it is in a standstill state. This is the look:
