In physics, overcoming friction and doing work is the meaning, please give an example for a detailed

The direction of the force doing the work is the same as the frictional force.

In the opposite direction, all the work done is converted into internal energy. It is to overcome friction and do work.

Example: Pull a small wooden block with a 20n pull force to accelerate the movement of 1 meter on a horizontal tabletop, and its friction force is 10n.

then the work done to overcome friction is: 10N*1m=10J** into internal energy); And the tensile force to do work: 20n*1m=20j; (Where: 10j is converted into internal energy and 10j is converted into kinetic energy.) ）

When two objects with non-smooth surfaces and squeezing each other are displaced, a force in the opposite direction to the relative displacement direction will be generated, that is, sliding friction, and the work done to overcome this force is to overcome the friction to do work. For example, dragging a box on the ground is a box without wheels. If there are wheels, just like the upstairs said when walking, the action between the shoes and the ground, that is static friction, there is no relative displacement, and it is not work.

If a person is wearing skates and glides on the ice by inertia, and as a result, there are traces of water on the ice, why?

The answer is that the ice blade does work on the ice to overcome the friction, and the internal energy of the ice increases, and it melts. Overcoming friction to do work means friction to do negative work. Different forms of energy can be converted into each other:

Frictional heat generation is the conversion of mechanical energy into internal energy by overcoming frictional work; When the water in the kettle boils, the water vapor does work on the lid of the kettle to lift the lid up, indicating that the internal energy is converted into mechanical energy; Electric current does work through the heating wire, converts electrical energy into heat, and so on."

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You walk, the sole of the shoe rubs against the ground, this is to overcome the friction to do work, the landlord you can't walk on the ground with 0 friction, so you will keep sliding, this is w=fl

Hand rubs, overcomes friction and does work, internal energy increases, temperature rises, and heat is felt.

The work done by frictional force is the same as that done by other forces, forcefully, and there is displacement along the direction of the force, then the work is done. If you do work by overcoming friction, it means that friction is generally negative work in life, and work done by overcoming friction is the opposite of ...... of work done by friction

There is a frictional force, and the direction of work done is opposite to the direction of friction.

When work is done by overcoming friction or compressed gas, mechanical energy will be consumed, and at the same time converted into internal energy, which can be obtained from the conservation of energy, and the number of mechanical hunger energy consumed is equal to the increased internal energy, and the total amount of energy remains the same

Therefore, the answer is to change the machine, mechanical, internal, mechanical, internal, and keep the mold limb judgment unchanged

An object placed on a flat surface pulls a certain distance s s in one direction with a tensile force f, which is f equal to the frictional force of the object, so the object overcomes the frictional force to do work.

w=fs If a certain height s is lifted vertically, then the object overcomes its own weight g and does work.

w=fs=gh

If the friction is not working, then the object does not have to overcome the friction.

So it's both doing the work.

Friction is doing the work that hinders the motion of the object, and the object is doing the work of overcoming the frictional force and moving forward.

Work is: the product of the force and the distance of the object in the direction of the force.

If the direction of velocity (pulling direction) of the object's motion is the specified direction, then the direction of friction is opposite, and the work done by friction is negative. This means that work is done to overcome friction.

It is to overcome difficulties to do something, friction is difficulty, and things can be completed if overcome.

For example, pushing the box forward, the box has friction with the ground, so you must use force to push, the force you use is the customer service friction, the friction is hindering the box forward, your force is the customer service friction, you are doing work in the customer service friction.

The total mechanical energy is reduced, and as long as there is friction, heat energy will be generated, so the total mechanical energy will definitely decrease.

Conservation of energy refers to the sum of all energies, if sound, light, heat, electricity, ...... are producedWhen other energies are available, the mechanical energy must be reduced.

But this refers to the total mechanical energy, and if the mechanical energy of an object increases or decreases individually, it depends on what kind of work the frictional force does on the object.

There are no other conditions, this is uncertain, the work done by frictional force is the same as the work done by other forces, and it depends on how the mechanical energy can change, depending on whether it does positive work or negative work. It's just that in general, when it is said that work is done by overcoming friction, it also means that friction is used to do negative work, and the mechanical energy will be reduced.

Overcome friction and do work, because the speed increases, the mechanical energy also increases

Since it is said that friction is overcome, then friction must do negative work, so the mechanical energy must be reduced.