momentum, angular momentum don't know?

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The laws governing the conservation of momentum of an object are one of the most important laws in physics.

It's a natural result of Newton's law.

According to Newton's second law, when an object is subjected to force, it produces acceleration. 

During the time the force is applied, the object accelerates to a certain speed.

Because force has a relationship between acceleration and F=ma, when force is applied to an object for some time, a physical quantity called mv is produced. 

We call this the amount of exercise.

But according to Newton's first law, the velocity of the object must always be constant, so the momentum of the object must be preserved unless another force is applied.

When colliding with another object, the objects that collide according to Newton's third law apply forces of equal size and opposite direction to each other.

And because they're applying force to each other at the same time, they get as much exercise as they lose on one side.

So the total amount of movement of objects is always preserved.

This is the famous law of conservation of momentum.

By the way.

In fact, the law on conservation of momentum was a concept that preceded Newton's law.

Aristotle, a truly great philosopher who is always ignored when modern people talk about science, 

He said that in order to change the movement of objects on the ground, you must always transmit power from the outside.

Aristotle's power is a little different from Newton's. 

It was like the concept of energy today.

There's a power source that moves objects, and it comes from the outside.

But some scholars opposed it.

The scholars said that contrary to Aristotle's claim, the material itself may have a hidden mass of force that causes it to move.

I thought this mass of force was related to mass and speed.

It was a concept similar to the current amount of exercise.

In the middle of the 12th century, Alphetraggius named this mass of power Impetus.

But the amount of exercise we have today is due to external forces.

Impetus was the idea that matter itself might have a force like life itself.

A mechanistic worldview has sprung up, and Impetus has failed to withstand many attacks from Renaissance scientists and has disappeared into the back of history. 

It has had a great influence on the formation of modern-day thinking about object movement.

Cartesian was the first to form a modern concept of momentum.

Many people know that Galilei created the concept of inertia,

Galilei's idea of inertia was that objects would continue to exercise because the Earth was round.

"The motion of an object continues in straight motion." 

It was Descartes who created the concept of true inertia.

Descartes, according to his own notion of inertia,

I thought there should always be a quantity preserved in the movement of an object.

The object keeps working out, so I guess it has something to keep.

So what we found was the amount of exercise that multiplied by the mass and speed of the object.

Descartes, in particular, found that in a collision between two objects, the total amount of movement of both objects before and after the collision was preserved.

He explained that the amount of momentum transferred from one object to another.

One of the giants of Newton's famous saying, 'If I had looked farther than others, it would have been because I was standing on the shoulders of a giant,' was Descartes.

Rotational motion is a movement in which the motion of an object does not change in the direction of the r under certain constraints when viewing space as a spherical coordinate system.

So, in order to make it easier to analyze these movements, scholars have redefined and used the concept of rotational force, rotational inertia, and angular momentum from Newton's law.

So what we've seen is that the rotation force, the same concept as the force in rotational motion, is related to the multiplication of the force acting on the axis of rotation to the point where the force acts.

The greater the distance from the axis of rotation, the greater the force, and the greater the force is applied in the same direction as the force is rotated.

Because the amount of exercise that is preserved when an object is subjected 

to any force for any period of time is the amount of exercise.

Even in a rotary motion that satisfies Newton's law, there must be some amount of material that is preserved when the object is subjected to any time.

This is called angular momentum.

Each movement depends on the distance from the axis of rotation and the magnitude of the movement of the object.

When an object has the same amount of momentum, the farther away it is from the axis of rotation, the greater the angular momentum.

Also, when rotating at the same distance, objects with a large amount of movement become more angular.

The important thing is that these angular momentum will continue to be preserved unless external forces are applied.

So you have to keep spinning.

You must be a little dizzy, huh?

When an object rotates like this, the direction of the angular momentum is set like this.

It's perpendicular to the rotating plane.

Why do I have to decide the direction?

Who's spinning me how? when asked

This is the most accurate way to tell the opponent the direction of rotation.

The role of mass in rotational motion is called rotational inertia.

A mass object doesn't move well even if it's applied to it, does it?

So rotational inertia is the property of trying to keep an object spinning.

If the rotational inertia is large, they try not to rotate well even if they apply the turning force.

The mass causing the inertia of an object is always constant in the same object.

Rotational inertia depends on how the object rotates.

So where the axis of rotation is important.

The farther away the parts that make up the object are from the axis of rotation, 

the greater the rotational inertia.

And of course, the larger the mass of the object, the larger it gets.

Angular momentum and rotational inertia are related to the following:

L=Iω 

ω means the angular velocity at which an object rotates.

In other words, angular momentum is the product of an object's rotational inertia and angular velocity.

According to the interpretation, each movement is greater as objects with greater rotational inertia rotate faster. Something like this.~

Since rotational inertia acts as a mass in rotational motion and angular velocity acts as a speed, it would be better to note the link between angular momentum L=Iω and momentum mv.

I think it's time to finish the video.

Let me summarize.