A person sits in a running car and jumps up. Why is he still in the same place? Will inertia increase with the increase of speed? Would you please elaborate on it?

because of inertia, in the vernacular, when you are in the car, you move forward at the same speed as the car, so your speed is equal to the speed of the car, and you are in a relatively static state. When you jump up, if you don't remember the air resistance and exclude some small external forces, your speed is still equal to the speed of the car, then you will continue to move forward in the air of the car, and when you land, you are still taking off. Let's take an easy-to-understand example.

A child is playing and jumping in the car. Suddenly, a small animal appears in front of him. The driver's uncle braked suddenly. At this moment, the child just jumped in the air, so it's conceivable that the place where the child landed was in front of the car.

I mean, after you jump, your speed and the speed of the car can be ruled out with some small resistance. You are still in the same place.

Here are some common sense about inertia.

It's because you love the small reward of learning physics knowledge (arrogant, hehe.)

The word inertia was put forward by Newton, a classical physics. Therefore, according to the definition of classical mechanics, the size of mass is the size of inertia, and mechanical theory can be established. F=ma, and m represents both the mass of the object and the measurement of inertia.

Inertia and inertial force are different concepts. Don't make a mistake.

when the inertia is large and the inertia force is small, the motion state of the object is not easy to change.

The problem with automobiles is that the mass of automobiles (the weight of automobiles on the ground is similar to that of automobiles) is a measure of the inertia of automobiles, and the magnitude of inertia is equal to the friction between automobiles and the ground when braking.