Ask a high school generic technology question

Discover and clarify the problem: Birds are friends of humans, but they are far away from us humans. Hopefully, birds will come back to us humans.

I interviewed my friends around me, and everyone had the same idea. Then, a simple analysis of the design is carried out to obtain the design requirements for the design of the bird's nest.

Develop a design plan: Review and collect some of our regular nests, and clarify the materials, structures, and connection methods that should be chosen. Make a model or prototype:

According to your own ideal plan, start to make the original shape of the bird's nest. Testing, evaluation and optimization: stability of the final nest, strength test and final optimization.

Questions to consider: stability of the structure, strength. The choice of materials, the cost of production, the production technology, the aesthetics, the practicality and so on.

Tools: Woodworking saws, wire saws, woodworking planers, steel tape measures, woodworking rulers, iron nails, hinges, screws, carpentry pencils, thicknesses above.

The dog has arrived.

First of all, prepare a number of wooden planks, a number of hay, a number of iron nails, a number of durable ropes, and a ladder. (i.e. tools).

Preparation: first make the bird's nest, use tools, make it about 20 cm square, put hay inside, and then choose the place where the birds are happy to concentrate, find a suitable place to place the bird's nest, the security site should pay attention to not be easily destroyed by children, good persistence, there is a foraging site nearby, the environment is better, and the bird's nest should be checked regularly whether the nest is a problem.

Imagine finding a tripart, surrounding some branches, putting some grass, making a nest.

Ladder up the tree.

Scissors to get the branches.

Hand pulling weeds.

This question is a bit more advanced and can be discussed by learning structural design. That is, the age should use the shape to make up for the lack of paper (as the saying goes, soft, mechanically it is low compression).

The structure should be stable, and the projection of the point where the center of gravity is located falls within the supporting surface.

This diagram is a planar figure, which can be simply understood as the supporting surface of this structure should be ab.

When lifting heavy objects, they fall to the right, indicating that their center of gravity is easy to deviate from the right side of ab (support surface).

Therefore, there are two main ways to improve: 1. Expand the support surface to the right 2. Adjust the heavy potato spring center of the structure to the left.

A: No, lowering B will make the number of heavy objects more to the right, and it will be unstable. Correctly the bracket at A should be lowered.

B: Correct answer, the support surface is expanded, and it is expanded to the right.

The support surfaces of C and D have not changed, but it is not easy to adjust the center of gravity of the structure to the left side, so it is wrong.

A group can have more than one person, buy electrical components, weld the base, and make the lampshade can be carried out at the same time, then one person buys electrical components, one person welds the base, and one person makes the lampshade for a total of 4 hours, and then assembles it takes 2 hours, and debugging takes 1 hour for a total of 7 hours, 11-7 = 4It can save 4 hours.

Halo: How did it fall into the math category?

The invention of the steam engine greatly promoted the development of human productive forces, contributed to the formation of capitalism, and promoted the progress of human civilization. However, at the same time, the use of steam engines caused air pollution, and a large number of steam engines were used in London at that time because of the developed industry, so that the sky in London at that time was dark and foggy.

From this, we can see that the progress of technology will bring us some unavoidable *** while promoting the progress of human society. The progress of human productivity has increased the ability of human beings to transform nature, because human beings produce in nature, and human beings have changed their own living environment while successfully transforming nature, the more human productivity is progressive, the stronger the ability of human beings to transform nature, and the greater the impact of human beings on the natural environment, the rapid changes in the natural environment often bring about various ecological or other disasters or disasters, the greater the changes in the natural environment, the greater the disasters and harms brought about

1. The lower the center of gravity, 2. The larger the contact surface, the more stable it is.

Those who meet the above conditions are: d.

Structural evaluation, as the name suggests, is to reflect the structural characteristics of the topic:

Item A illustrates the relative position of the portrait and the slogan, which is structural;

Item b illustrates the relative position of the towers on the stones;

Item d illustrates the relative position of the wooden columns supporting the roof;

Item C simply points out the patterns on the roof, ceiling, bucket arch, and beam, and there is no structural description, so C is chosen

The theme inside.

The friction between the cup body and the hand can increase --- more stable and stable.

It can prevent hot water on your hands from scalding --- safety.

The answer is d, no problem. The uncompressed pressure of the ribbon will be deformed, immediately pulled and tightened. The wood is mainly tightened by tensioned webbing.

For the exhibition bracket, its height is suitable for the crowd**, then answer A can not meet the exhibition function requirements of the exhibition bracket.

The width of the exhibition bracket is based on its exhibition content, and if the top width is too small, it cannot accommodate the exhibition content, and the role of the exhibition is lost.

The stability of the exhibition bracket is only related to its structure, and has basically nothing to do with the material of the exhibition bracket.