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Welcome to the channel Jendela Science, the channel for those of you who want to understand the lessons of Mathematics, Physics and Chemistry in high school. In this video we will discuss the first part of the particle dynamics, namely Newton's law of motion. Keep watching this video until the end.
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The first one is Newton's law of motion. So there are three laws of motion. Maybe some of you have studied this when you were in high school. Here I will review and we will go deeper into the details and the calculation.
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Let's start from the first law. The first law from Newton says, if the resultant of the motion that works on an object is equal to zero, then the silent object will remain silent and the moving object will move at a constant speed. So here the formula is sigma F = 0 because the resultant of the motion that works on an object is zero. The resultant of the motion you have learned in the Bump Factor, namely the sum of the motion that works on an object.
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If the result is 0, then the silent object will remain silent, the moving object will remain moving. But, if the result of the type that works on the object is equal to 0 or sigma f is equal to 0, it is not necessarily that the object is silent, it can be that the object is moving. But if the object is moving, it is moving at constant speed or with constant speed, it does not have acceleration, or in other words, it is GLB .
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Law 1 is also called the law of laziness. What is laziness? Another word for laziness is laziness. Laziness or the tendency of something to hold its position. If it is silent, it wants to stay silent. If it is already moving, it wants to stay moving.
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It's called laziness or laziness. An example of a Newton's law is like this. For example, you're driving a car. You're driving a car, you're sitting still. At first, the car is still, not yet on the road. When you're on the road, suddenly the driver kicks the gas. What happens to your body? Your body will be pushed back.
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When the driver suddenly kicks the gas, your body will be pushed back. Why is that? Because the human body can be considered as a matter that has mass, so it fulfills the law of one Newton, namely the tendency of matter to hold its position. At first it was silent, it wanted to stay silent, the car moved as if its body was left behind, so it was pushed back. Like being surprised.
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That's what I mean by weakness. After that, we are used to it, we are adapted to it, the car is moving, we are used to it. Then suddenly, there is a red light, the car will be braked, especially if the brake is a bit bumpy. Then what happens? Our body will be pushed forward if now. Why is that? Because we are used to moving, that is, according to the speed of the car. When the car's speed is suddenly lowered, braked until it stops at the red light,
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then our object or body will tend to defend its position, which is moving, still want to move, the car is already braking, already want to stay still, the object is still moving, so our body is pushed forward. That is an example of the law of one Newton, namely the law of laziness or laziness or the tendency of an object to defend its position. Stay still, want to stay still, move, want to stay move.
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Okay, let's continue to the second law. The second law says that the speed experienced by an object is straight and in line with the direction of the momentum and is reversed in relation to its time. So here it shows the relationship between the speed of momentum and time. The speed is straight and in line with the direction of momentum. Then it is reversed in relation to its time, which means that A is the same as straight compared to momentum, which means sigma F.
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Comparing the opposite with time, it means that m is below, per m. It means that a = σf/m, or if we move the space, σf = m*a. This is the formula for Newton's law. Acceleration is not only directly proportional to the momentum, but also in the direction of the momentum. So if the momentum is to the right, it means that the acceleration is also to the right. Acceleration in the direction of momentum.
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The third law, if the first object works on the second object or is called action, then the second object will also work on the first object, called reaction, which is the same size but the direction is opposite. Well, for example, if you swim, you swim so that you want to move forward, then what do you do? Then your hands have to push the water back.
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The first object works the style on the second object, the hand works the style on the water. That is called action. Then the water will also work the style on the hand or in general works the style on our body. The size is the same but the direction is opposite. If the hand pushes it back, then the water pushes us forward.
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And the size is the same. If we work on a 100 N, we push the water 100 N backwards, then our body will also be pushed by the water 100 N forward. The stronger we push it, we increase the force to 200 N, then the water will also push our body 200 N forward. Do you understand? So the size is the same.
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The direction is opposite. So this reaction action is like a cause and effect. If there is an action, it means there is a reaction. If there is no action, there will be no reaction. If we don't push the water back, then the water will not push our body forward.
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And the magnitude of the action and reaction is the same. The stronger your hand pushes the water back, the stronger the water will push your body forward. Here, because the direction is opposite, the formula is F = -F . So if the F is 100 N, then the F is -100 N. The minus sign indicates the direction is opposite, but the magnitude is the same. Okay?
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And this is for the explanation, sigma f is the resultant of Gaia in Newton, m is the mass of a object in kilograms, and a is the speed of a object in meters per second squared. Okay? Okay, that's all for this video. To see the complete playlist of this section, you can click the thumbnail on the top right. If you have any questions, suggestions, or criticisms, you can write them in the comments section. Hopefully it's useful, and see you in the next video.
