"Mechanical Efficiency" Simple Machinery PPT Courseware 2 Simple campus recruitment activity planning plan summary enterprise and institution recruitment publicity lecture PPT template is a general PPT template for business post competition provided by the manuscript PPT, simple campus recruitment activity planning plan summary enterprise and institution recruitment promotion Lecture PPT template, you can edit and modify the text and pictures in the source file by downloading the source file. If you want more exquisite business PPT templates, you can come to grid resource. Doug resource PPT, massive PPT template slide material download, we only make high-quality PPT templates!
| 文件名 如何下载使用 | 下载次数 | Download Points | 下载地址 |
|---|---|---|---|
| "Mechanical Efficiency"... | 11425次 | 0.00 | Free Download |
Tips: If you open the template and feel that it is not suitable for all your needs, you can search for related content "Mechanical Efficiency" Simple Machinery PPT Courseware 2 is enough.
How to use the Windows system template
Directly decompress the file and use it with office or wps
How to use the Mac system template
Directly decompress the file and use it Office or wps can be used
Related reading
For more detailed PPT-related tutorials and font tutorials, you can view: Click to see
How to create a high-quality technological sense PPT? 4 ways to share the bottom of the box
Notice
Do not download in WeChat, Zhihu, QQ, built-in browsers, please use mobile browsers to download! If you are a mobile phone user, please download it on your computer!
1. The manuscript PPT is only for study and reference, please delete it 24 hours after downloading.
2. If the resource involves your legitimate rights and interests, delete it immediately.
3. Contact information: service@daogebangong.com
"Mechanical Efficiency" Simple Machinery PPT Courseware 2, due to usage restrictions, it is only for personal study and reference use. For commercial use, please go to the relevant official website for authorization.
(Personal non-commercial use refers to the use of this font to complete the display of personal works, including but not limited to the design of personal papers, resumes, etc.)
Related reading
For more detailed PPT-related tutorials and font tutorials, you can view:Please click to see
Authoritative PPT Summary
"Mechanical Efficiency" Simple Machinery PPT Courseware 2
learning target
1. Understand what useful work, extra work and total work are.
2. Understand what mechanical efficiency is.
3. Explore what factors are related to the efficiency of inclined plane machinery.
think about it
What is the useful work of a person who draws water from a well with a bucket? What is extra work?
The work done on the water is useful work, and the work done on the bucket is extra work.
If a bucket falls into water and the bucket filled with water is picked up, what is the useful work? What is the extra work?
The work done on the bucket is useful work, and the work done on the water is extra work.
Mechanical efficiency
1. Definition: The ratio of useful work to total work is called mechanical efficiency.
2. Expression: W has/W total
Because mechanical efficiency is the ratio of two works, it has no units.
1. Is there any machine with 100% mechanical efficiency? Why?
No! Because useful work is always less than total work, mechanical efficiency is always less than 1.
2. How can we improve the efficiency of machinery?
Reduce extra work
Improve the structure to make it reasonable and lightweight
Regular maintenance and regular lubrication
Explore the relationship between the mechanical efficiency of the inclined plane and the slope of the inclined plane
Experimental steps
1. Measure the weight of small wooden blocks and record the data;
2. Use a spring dynamometer to pull the small wooden block upward at a constant speed along the incline; record the pulling force F, the distance s the block moves along the incline, and the height h the block rises to;
3. Change the inclination of the bevel and repeat step 2.
Mechanical efficiency of bevels
The mechanical efficiency of the inclined surface is related to the smoothness of the inclined surface and the slope of the inclined surface. The smoother the inclined surface and the smaller the slope, the higher the mechanical efficiency.
Class exercises
1. Regarding mechanical efficiency, which of the following statements is correct ( )
A. Mechanical efficiency is always less than 1
B. The more work a machine does per unit time, the higher the mechanical efficiency.
C. The more work a machine does, the higher its mechanical efficiency will be.
D. The more labor-saving machinery, the higher the mechanical efficiency.
2. The mechanical efficiency of a certain machine is 75%, which means that this device is used to do work ( )
A.The total work is 3 times the additional work
B. The useful work is 3 times the extra work
C. Total work is 3 times the useful work
D. The extra work accounts for 3/4 times of the total work
3. In order to improve the mechanical efficiency of the pulley block, which of the following practices is correct ( )
A. Lift heavy objects at a fast and constant speed
B. Lift the heavy object at a slow speed and uniform speed
C. Increase the number of rope strands that bear the weight of the object
D. Make the pulley lighter and reduce the friction during the rotation of the pulley.
Keywords: Simple Machinery Teaching Courseware, Mechanical Efficiency Teaching Courseware, New People’s Education Edition Physics PPT Courseware for 8th Grade Volume 2, 8th Grade Physics Slide Courseware Download, Simple Machinery PPT Courseware Download, Mechanical Efficiency PPT Courseware Download, .ppt format
For more information about the "Mechanical Efficiency of Simple Machines" PPT courseware, please click on the "Simple Machines ppt Mechanical Efficiency ppt" tab.
"How to Improve Mechanical Efficiency" Mechanical Work and Mechanical Energy PPT courseware:
"How to Improve Mechanical Efficiency" Mechanical Work and Mechanical Energy PPT Courseware 1. Useful work, extra work, total work Think about it: What methods can be used to transport sand up to the third floor? Question 1: Which work achieves the purpose of our work? Work done on a heavy object (sand). it works..
"Mechanical Efficiency" Simple Machine Work PPT Courseware 2:
"Mechanical Efficiency" Simple Machinery Work PPT Courseware 2 Three kinds of work of machinery To increase G, the pulley must also be increased at the same time. At this time, you have to overcome the gravity and friction of the pulley and do extra work, otherwise you will not be able to complete the task. This skill has no use value but has to be done. It is an extra skill...
"Mechanical Efficiency" Simple Machine Work PPT Courseware:
"Mechanical Efficiency" Simple Machine Work PPT Courseware Learning Objectives (1) Know the concepts of useful work, extra work, and total work; (2) Master the concept and calculation formula of mechanical efficiency; (3) Understand the methods of increasing mechanical efficiency. ... ... ... 1. Useful work and...