Hebei Yingxiangda Machinery Manufacturing Co., Ltd. is a limited liability company (individual sole proprietorship) registered on October 19, 2018. Its registered address is located in Qingliangcheng Village, Zhangdeng Town, Qingyuan District, Baoding. City, Hebei Province.
The social credit code/unified registration number of Hebei Yingxiangda Machinery Manufacturing Co., Ltd. is 91130608MA0CU4RQ7M. The legal entity is Li Xingchao. The company is currently in operation.
The business scope of Hebei Yingxiangda Machinery Manufacturing Co., Ltd. is as follows: hand hoists, electric hoists, hoists, cylinders, slings, power tools, air tools, air tools, generators and hardware products and accessories. manufacturing and sales. (Projects that require approval according to law can only carry out commercial activities after the approval of the departments concernedborn).
View more news and information about Hebei Yingxiangda Machinery Manufacturing Co., Ltd. via Aiqicha.
Revision materials for the first unit of the sixth grade science volume
1. When we work, the devices that can save us work or make it convenient are called machines. Mechanical structures such as screwdrivers, hammers and chisels are very simple and are also called simple machines.
2. A simple machine like a crowbar is called a lever. It has three points. The position where the force is applied is called the point of force. The position where resistance is overcome is called the resistance point. The position that supports the lever and allows the lever to rotate is called the fulcrum.
3. When the lever ruler is balanced, the number of hooks on the left multiplied by the number of grids equals the number of hooks on the rightoite multiplied by the number of grids.
4. When the distance between the point of resistance and the fulcrum point is greater than the distance between the point of effort and the fulcrum point, the lever is laborious.
When the distance between the point of resistance and the fulcrum point is equal to the distance between the point of force and the fulcrum point, the lever is effortless and effortless.
When the distance between the point of resistance and the fulcrum is less than the distance between the point of force and the fulcrum, the lever is effortless.
5. Like a faucet, the wheel and axle are fixed together and the machine that can rotate is called a wheel and axle.
6. Like the pulley at the top of the flagpole, a pulley that is fixed in one position and rotates without moving is called a fixed pulley. A pulley that can move with a heavy object is called a movable pulley.
7. Use the moving pulley and thepulley fixed together to form a pulley block.
8. A simple machine like a wooden board placed on a car cabin is called a slope.
9. The smaller the slope of the slope, the lower the force used to lift the object up the slope. The greater the slope of the slope, the greater the force used to lift the object up the slope. . The denser the thread of a screw, the easier it is to screw them in.
10. The chain meshes with the two speeds and plays the role of transmitting power but not moving the bicycle.
11. Comparison of different simple machines:
Simple machines
Examples
Lever
Labor-saving lever
Bottle opener, nut cutter, nut pliers, claw hammer
Easy and without effort
Tilting, stapler, scale
Powerful lever
Chopsticks, tweezers, fishing rod
Wheel and axle
Faucets, door handles, steering wheels, wrenches for tightening nuts, screwdrivers for tightening screws
Inclined surfaces
Winding mountain roads, bridge approaches, screws< /p >