A rock hit your windshield or the windshield hit a rock?

Now the ball behaves more like you are waiting. The horizontal speed decreases to fall behind the original car. But it’s not yet going to hit your windshield. With air loss and energy loss on the effect of air, each leap is slightly lower than before. You have to be fine.

Erase

Now tell me that the child falls on a rock through the window. Kids! Or maybe there’s a truck carrying gravel and some slides from a crack. When the rock reaches the road, the movement can change in several ways. First, there is a friction capacity between rocks and roads, which will reduce the horizontal speed of the rock. As we have seen above is more slowly bad.

The second and this may seem strange, because a rock is irregularly shape, because it is possible to twist and strike the pavement that causes him to start starting.

Wait! Isn’t this a violation of the law? You know, the law of protection of energy? No, it’s an energy hand over. There is both rotation and translation (linear) kinetic energy from a rotating and moving rock. Some clashes can turn the rotation energy into translation energy, which leaves the rock. It’s higher.

Here it may seem:

So you are watching along the highway, say, 70 miles per hour – there is a rock in the air at the head of the road. At one time, you are in the rest, but you are not. Let’s note: The rock did not hit you. You hit the rock. But the effect is the same. In either case, you need a new windshield.

Rock and roll

This is a suitable scenario, but what if you don’t have a truck in front of you? In fact, a more prominent reason for the windshield damage is a river that lies on the road kicked by another vehicle. You can think behind this behind it, but it’s not so correct. The rock is still not moving backwards.

Imagine: A wheel rolls along the way and a rock bumps between tire facilities. When the rock is in contact with the ground, it is at rest. Here it looks like this: