6th Grade Science Review Materials, 6th Grade Science Papers

Unit 1 Tools and Machinery.

1. Use tools.

1 Mechanical is a device that allows us to save effort or convenience.

Unit 1: Simple Mechanics.

1. Like an iron sheet that opens a paint bucket, a simple machine that can pry up an object around a fixed fulcrum is called: . A lever is a simple mechanism, and it has three of them:

2. The following are labor-saving levers: . Corkscrews, juicers, wheelbarrows) belong to the laborious levers are:

(tweezers, chopsticks, barbecue tongs) belong to the levers that can sometimes save effort and sometimes can be laborious.

scissors, maces, crowbars, nail pullers).

3. The wheels that are fixed on the bracket and do not move with the weight are called. The fixed pulley can not save force, but it can change the direction of force; The pulley that moves with the weight is called, and the movable pulley can save force but can not change the direction of force; If you want to save effort and change the direction of force, you can use it. The more pulley groups there are, the more they are.

Fixed pulley, movable pulley, pulley block, labor-saving).

4. If you think of the pulley as a kind of lever, will you find the three points of the lever? Can you use the lever principle to explain the different roles of fixed pulleys and movable pulleys?

5. The inclined plane is also a simple machine, and the longer the inclined plane, the longer it is.

6. In this unit, we have learned several simple mechanics:

7. The bicycle makes comprehensive use of other mechanical principles. (levers, axles).

8. The places around us where the axle principle is applied are: . Car steering wheels, faucet switches, door lock handles, wrenches).

9. The places that use inclined planes in life are: . Kitchen knife edges, stairs, winding roads, approach bridges for overpasses, nail tips for nails, axes, scissors, threads for screws).

10. In the lever, the distance from the fulcrum to the force point is greater than the distance from the fulcrum to the key point. The distance from the fulcrum to the force point is less than the distance from the fulcrum to the focal point is . The distance from the fulcrum to the force point is equal to the distance from the fulcrum to the focal point is .

Labor-saving, labor-intensive, and equal effort).

Unit 2: Shape and Structure.

1. The relationship between the thickness of the paper and the bending resistance of the paper strip is: .

2. The test found that the "one" shape of the thin material can enhance its bending resistance by changing.

3. Whether the load-bearing beams are placed horizontally or vertically when building a house, the reason is. (Reason for vertical release: large vertical thickness can enhance bending resistance).

4. Zhaozhou Bridge is a long-lived stone arch bridge. When the arch is stressed, it can transfer the pressure downwards and outwards to the adjacent parts. When the arch parts are under pressure, if they can withstand the arch, the arch can withstand tremendous pressure.

5. The shape of the pot lid, helmet, and astronomical observatory are all called. Do you know arches and other arches in living organisms?

6. The frame structure is the most widely used structure, and its advantages are: saving materials and achieving high strength.

7. Triangles and quadrilaterals are the most basic frame structures, and the reason why we usually use triangles to reinforce the frame is that it has .

8. The secret of the tower not toppling is: . The top is small and the bottom is large, the bottom is light and the bottom is heavy).

9. Cable bridges are divided into: and . (cable-stayed bridges and suspension bridges).

10. Cable bridges are usually composed of , . (steel cables, pylons and decks).

That's a lot! Buy a full solution for yourself and study it well!!

Sign up for an account, and there are a lot of them on Baidu.

Every year is different, so you might as well review it!