The action force and the reaction force are generated at the same time and disappear at the same tim

The relaxation and pressure you are talking about here are the cases of no force and force respectively.

When you press the spring, your hand is stationary, but the force is still acting on the spring.

The reaction force that the spring gives you.

How else would you know you have a spring under your hand?

That's what the spring gives you to feel the reaction force.

And when you let go, you really don't give it any more force, and the moment it gives you is gone

But what's the matter with how it bounces you off -- when the spring gets back to its original length, it touches your hand, and you can't shrink your hand, and it hits the spring again, and it gives you a reaction force (otherwise you wouldn't know the spring is bouncing you off).

Therefore, the action force and the reaction force are generated and disappeared at the same time.

I hope it will be helpful to you, if you don't understand, please ask if you are satisfied.

Hello! You said that your hand is loose, but you retract your hand and the spring springs into your hand, which means that the spring is still in contact with your hand and is still elastic to your hand.

At the same time, at this time, you also have a force on the spring, because you have not had time to retract your hand, your hand is still in contact with the spring, and the spring is also in a state of compression, and this compression is caused by the elastic force of your hand on the spring. Hope.

Categories: Education, Science, >> Science & Technology.

Problem description: If you stomp on the surface of the water with your foot, the surface of the water should also give your foot an equal amount of reaction force, but why does it feel like this force is less than your force? I don't think it's an illusion, but if it's an illusion, then when you use enough force, won't you be able to jump on the water?

Analysis: This question is not what you think. The action and reaction forces are equal.

The only difference is the question of pressure and pressure, which also includes the decomposition of forces in mechanics.

I believe there is a long-term picture, and the landlord should have seen it. It's a skier, you have to have skis under your feet, and if you don't have skis, you get stuck in the snow. When rowing, the oars are rowed in one direction and the boat goes in the opposite direction.

The former illustrates the problem of pressure versus pressure. The latter illustrates the problem of acting on the reaction force and covering the decomposition of the force.

Stomp on the surface of the water with your foot. The foot is the object of force, and the water is the object of force. People gather the force on the feet and exert force on the water, because the water is in a liquid state, so the force is decomposed, and the surrounding water molecules will be forced, and then you will see the ripples caused by the water spreading to the surroundings after being forced.

The force decomposed by water expands to a single surface, while the object applied is only a point from the point of view of physics. Therefore, the force emanating from the surroundings cannot be felt and can only be seen.

Because the force you have from a physical point of view is an illusion caused by the pressure being greater than the pressure.

If you can evenly exert yourself on an object (e.g. stepping on a plank longer than your height) and standing on a large surface of water, then you step on the surface of the water again and it will lift you up very evenly. But because the water spreads so much, you still won't jump. Because the pressure you put on at this time still doesn't give the water enough force to push you up.

If you can increase the pressure in other ways, maybe you can actually jump.

You can try. Hehe.

Categories: Education Academic Exams >> Gaokao.

Problem Description: Physical Problem: A thin man wrestles with a strong man. As a result, the emaciated man lost.

Is the force between the two hands as great as the reaction force?

If the two are the same size, why would Hercules win?

Here's how I think :

According to the forces always occur in pairs, the acting force and the reaction force are equally large.

The force on the thin man's hand = 1 reaction force on the hand when applying force to the strong man + 2 the force of the strong man on his hand.

And the force on the strong man is also = 3 when the force is applied to the thin man's hand + 4 the force of the thin man on his hand.

And the force 1 = 4 2 = 3

So theoretically it should be.

But the facts. If you want to refute me, please see what I think first, and point out the mistakes of my words sentence by sentence!

Thank you! Hope it helps!

Analysis: I looked at your train of thought again.

Just like A pulls B, A has a pull force on B, and B also has a pull force on A, but these two pulls belong to action and reaction forces and can be ignored.

The action force is the reaction force, although the two forces are equal. It's a force acting on two objects, so you can't balance an object. Because for each object, they are only subjected to one of these two forces. So it can't be balanced.

The force between the hands is only one pair, not for each hand. The object of the action and reaction force is a system composed of two hands, not a single hand. Therefore, there is no need to consider the force between two objects, and it is enough to calculate the force of two hands against each other.

a. The action force and the reaction force are always equal in magnitude and opposite directions, acting on the same straight line; Arises at the same time, changes at the same time, and disappears at the same time, so a is correct;

b. The action force and the reaction force act on different objects, and the action effect cannot be counteracted, so B is wrong;

c. The action force and the reaction force are forces of the same nature, and the properties of gravity and pressure are different, so C is wrong;

d. Team A and Team B have a tug-of-war competition, and the force of Team A pulling the rope is equal to the force of Team B pulling the rope, so D is wrong; So choose A

The action force bai and the reaction force are created and disappear together, and the du will never exist alone. However, this pair of "twin brothers" are two sworn enemies of the DAO, and they always go against each other.

First of all, the acting and reactive forces always act on the two objects separately and never act together.

You see, you hit your right hand hard with your left hand, and both hands hurt. It means that if there is a force acting on the right hand on the left hand, there must be a force acting on the left hand at the same time on the right hand. When knocking an egg on the edge of the bowl, the force of the egg acts on the edge of the porcelain bowl, and the reaction force on the edge of the porcelain bowl acts on the egg shell.

In addition, when a stone is thrown on the concrete floor from a high place, the concrete floor is subjected to the force of the stone, and at the same time, there is a reaction force acting on the stone, causing the stone to shatter.

The buoyancy of the water acts on the steamer, and the reaction force of the steamer acts on the water.

Secondly, the direction of the action and reaction forces is always opposite.

Summary. 1) Action force = reaction force when the state is unchanged. For example, the cart is not pushed, and the force = the reaction force.

For example, the cart being pushed moves at a constant speed, and the action force = reaction force. Because the state is not the same. 2) When the state changes, the action force does not = the reaction force.

For example, the car pushes faster and faster, and the force is greater than the reaction force. If the cart is being pushed slower and slower, the force is less than the reaction force until the state remains the same, or until the force = reaction force. Because the car is getting slower and slower, the power is getting smaller and smaller, resulting in less and less power for the resistance to consume power, that is, the reaction force is getting smaller and smaller, so the real state can be produced unchanged!

Hehe, why does the book say that the action force is equal to the reaction force, but in life the action force is greater than the reaction force?

For example, if the car moves at a constant speed, the action force = reaction force. Because the state is not the same. 2) When the state changes, the action force does not = the reaction force.

For example, the car pushes faster and faster, and the force is greater than the reaction force. If the cart is pushed slower and slower, the force is less than the reaction force until the state remains unchanged, or until the force = reaction force. Because the car is getting slower and slower, the power is getting smaller and smaller, resulting in less and less power for the resistance to consume power, that is, the reaction force is getting smaller and smaller, so the real state can be produced unchanged!

Hehe, got it. Got it.

Okay, dear, it's good to understand, please give me a thumbs up!

Difference: Acting force vs. reaction force.

Equilibrant. 1.Acting Object: Two forces acting on two objects.

Two forces acting on the same object.

It doesn't have to be both spawning and disappearing at the same time.

3.The nature of the force: It must be a force of the same nature.

It doesn't have to be a force of the same nature.

4.Effect: Because of a pair of action and reaction forces.

The effect of a pair of equilibrium forces.

Acts on two objects, each producing.

It is to keep the object in equilibrium.

It has an effect, so it cannot be used as a make.

The resultant force is zero. The condition of the equilibrium of the object.

1.When an object has a force on another object, it is also subjected to a force on it by another object.

2.The force of action and reaction between two objects, always equal in magnitude and in opposite directions, acts on the same straight line, which is Newton's third law.

3.Action and reaction are complementary pairs of forces that appear and disappear at the same time.

4.The action force and reaction force act on different objects, and it is necessary to pay attention to the point and direction of the force on the object when analyzing the force.

Extended Materials. In mechanics, the reaction force is always in pairs, and the force corresponding to one of the forces (called the acting force) is equal in magnitude and in the opposite direction, called the reaction force.

Why does a backward jet propel a rocket forward? Why does the shell move backwards when the shell moves forward? This is the principle of action and reaction.

When object A gives object B a force, object B must at the same time give object A a reaction force; The acting force and the reaction force are equal in magnitude, opposite in direction, and acting in the same straight line. This is a common property of all things in nature.

When we walk, we push the ground backwards (force), and the ground pushes the foot forward (reaction) to move our body forward. When rowing, the oars push the water backwards (force), and the water pushes the oars backwards (reaction force), allowing the boat to move forward.

Similarly, the gas ejected backwards propel the rocket backwards. The cannon exerts a force on the shell when fired, and while the shell moves forward, the reaction force will cause the gun body to move backwards.

The relationship between the action force and the reaction force is a pair of equal large reverse forces acting on different objects.