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Question 3; Inertia is a property that an object maintains a uniform linear motion state or a static state, which is only related to the mass of the object itself and has no other conditions.

Here I will focus on the relationship between inertia and quality.

The premise of comparing two objects is that under the same conditions.

Ok, now let's talk about the relationship between inertia and mass. The greater the mass, the greater its inertia.

It should be noted that the speed of an object is very high, so it cannot be said that its inertia is large, and inertia has nothing to do with speed.

Why do you say that objects with large mass have large inertia?

For example, there are two objects A and B on a smooth horizontal plane.

Mass M 1

Mass M2 of object b

m 1 & gt； The second part of money supply

They all do uniform linear motion,

Suddenly, two identical forces (opposite to the speed) act on two objects respectively.

Because m1>; The second part of money supply

F 1=F2

According to Newton's second law:

a 1 & lt； Aortic second sound

Then the speed change of object a is less than that of object B.

So its inertia is large.

For example, bicycles are easy to brake, but trains are not.