Why do people use oars to row backwards for oars, and the water has a forward reaction force on the

This is the problem of conservation of momentum in classical mechanics. When the oars and the slippery man and the boat on which the man sits are regarded as one, and the water as the other one, the two objects form a system, in which the system can only be free from external forces, constituting the condition of the ox, Newton's first law explains that when the object is not affected by external forces, or moves in a straight line at a uniform speed, it is called equilibrium. That is, the system should be seen as a system in which the various components should be in balance.

The paddle slides backwards, causing part of the water to flow backwards, and to release this backward ability, the forward movement of the human ship is necessary. Niu San's explanation upstairs is also very good. The action and reaction forces are the microscopic internal causes of this.

Conservation of momentum is macroscopic intrinsic.

Man and oars and boat are one and a whole, paddling backwards, and the water is subjected to backward force, so the water is backwards; And the effect of force is mutual, when a person strokes backward and hard, the water will also have a forward force on the person, and the person and the boat will also move forward under the action of this force.

Because the action of force is mutual. That's what Newton's third law says.

Just like you push a wall with your hand, you can't slide against the wall, the pulp is the same as your hand, and the water is the wall.

Action and reaction forces.

When you walk, the friction between your feet and the ground is the same as the question you ask, and you can see it when you think about it.

The action of forces between objects is reciprocal; When an object exerts a force on another object, the object is also subjected to a force of equal magnitude and opposite direction exerted by the other object

When rowing, the oars have a backward force on the water, and since the force between the objects is reciprocal, the water also exerts a forward force on the oars, and this force is the driving force of the boat

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Holding the oars and paddling backwards, while the oars exert force on the water, the water exerts a forward force on the oars, and the force of the water on the pippy lead oars causes the boat to move forward before the grip, indicating that the force between the objects is reciprocal

Therefore, the answer is: the effect of force combustion between objects is mutual

When rowing, the water is paddled backwards, and the oar gives the water a backward force, because the force between the objects is mutual, and the water also exerts a forward force on the paddle, which is the power of the boat to move forward, so the force object that makes the boat move forward is water

Therefore, choose a wax tremor.

b.The thrust of the water on the slender oar.

Because the action of the force is reciprocal, when the oars are rowed backwards and there is a backward force on the water, the water will also have a forward reaction force on the oars, and it is the action of this force that makes the boat move forward.

This reaction force does not act directly on the ship, but acts on the pulp, which then acts on the ship to make the ship move forward.

There are two specific reasons, one is to use the water as the fulcrum when paddling to force forward (in fact, water can also be used as a support, don't think that water is flowing), so that the boat can generate forward momentum and move forward.

The second is the fluidity of the water, after the slurry is boiled, the water after the slurry will move backwards, and naturally the water in front will move backwards, and according to the streamlined design of the boat, the water pressure in front will be weaker, so that the boat will have the power to move forward.

In fact, this problem is related to the special structure of water, which can be found in physical data.

a. The force of the human hand acting on the oar, its reaction force should be the oar acting on the human hand, and these two forces are not the force that directly makes the ship move forward, which is not in line with the topic;

b. The force of the water acting on the oars pushes the oars, which in turn pushes the boat, so it is the force that moves the boat forward, which is in line with the topic;

c. The water does not act directly on the hull to push the hull forward, but acts on the oars, which is not in line with the topic;

d. The direction of the force of the oar acting on the water is backward, not the force that makes the boat move forward

a. The force of the human hand acting on the oar, its reaction force should be the oar acting on the human hand, and these two forces are not the force that directly makes the ship move forward, which is not in line with the topic;

b. The force of the water acting on the oars pushes the oars, which in turn pushes the boat, so it is the force that moves the boat forward, which is in line with the topic;

c. The water does not act directly on the hull to push the hull forward, but acts on the oars, which is not in line with the topic;

d. The direction of the force of the oar acting on the water is backward, not the force that makes the boat move forward

Answer: c

Analysis: The action of the force between objects is mutual, people act on the oars, the oars act on the water, the water has a reaction force on the oars, and it is this reaction force that makes the ship move forward.

cThe force of the water pushing the oars and acting by the oars on the boat.

cThe force of the water pushing the oars and acting by the oars on the boat.