"Gong" Work and Mechanical Energy 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 |
|---|---|---|---|
| "Gong" Work and Mechanic... | 15275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 "Gong" Work and Mechanical Energy 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
"Gong" Work and Mechanical Energy 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
"Gong" Work and Mechanical Energy PPT Courseware 2
1. Work in mechanics
1. Definition: When a force acts on an object, and the object moves a certain distance in the direction of the force, it is said in mechanics that this force has done work.
The child's pulling force F pulls the puppy to move a distance s. We say that the child's pulling force has done work on the puppy, or simply that the child has done work on the puppy.
The lifting force F of the forklift moves the goods a distance s. We say that the lifting force of the forklift has done work on the goods, or simply that the forklift has done work on the goods.
The force F of the hammer on the nail moves the nail a distance s. We say that the force of the hammer does work on the nail, or simply that the hammer does work on the nail.
2. Two necessary factors for doing work
necessary factors
(1) A force acts on an object F
(2) The object moves a distance s in the direction of the force
3. The situation when the object does not do work
(1) The object is acted upon by a force but remains at rest
s=0, no effort
(2) The object is not affected by force in the direction of movement and moves due to inertia.
F=0, no effort, no result
(3) The object is acted upon by a certain force, but the direction of motion is always perpendicular to the direction of the force.
F⊥s, hard work without success
Decide whether the following statements are correct and tell why.
1. When a weightlifter lifts a barbell, work is done by the lifting force.
2. The traction force of the car makes the car move forward horizontally, and the traction force does work on the car.
3． When an apple falls from the tree, gravity does work on the apple.
4. Pull the car to move a certain distance on the horizontal plane, and the support force of the table does work on the car.
5. Kick a football with your feet and the ball rolls on the ground. During the rolling process, the person does work on the ball.
think
You push the wall hard and the wall doesn't move. Have you done any work on the wall?
A force acts on an object, but the object does not move a certain distance in the direction of the force, so the force does no work.
I throw the chalk in my hand horizontally and the chalk flies in the air. Have I done any work on the chalk?
There is no force on the object, it moves by inertia, and the force does no work.
2. Calculation of work
1. Work is equal to the product of the force and the distance the object moves in the direction of the force.
2. Calculation formula: W = Fs
3. The unit of work: joule, referred to as joule, symbol J
1J = 1N·m
If a force of 1N moves an object a distance of 1m in the direction of the force, the force will do 1J of work on the object.
principle of mechanical work
When working with machinery, sometimes you can save effort, sometimes you can save distance, but saving effort will inevitably cost distance, and saving distance will inevitably require effort. It is impossible to save both labor and distance. In other words, the use of any machinery cannot save energy. This conclusion is called the principle of mechanical work.
Classroom training
1. An object weighing 100 N moves forward 4m at a constant speed on a smooth horizontal surface due to inertia. The work done by the external force is ____J and the work done by gravity is ____J.
2. After school, a classmate walked 200 m along the level road carrying a schoolbag weighing 40 N, and then climbed to the fourth floor about 10 m high before returning home. Then the work he did on the schoolbag during his return home is approximately ( )
A.0J B.400J C.2000J D.2400J
3. At the Olympic Games, Chinese athlete Ding Meiyuan won the gold medal in the women's weightlifting category above 75 kg. Her clean and jerk score was 165 kg. Estimate the work she did on the barbell during the entire clean and jerk process as ( )
A.3×102 J B.1×103 J
C.3×103 J D.5×103 J
Keywords: work and mechanical energy teaching courseware, work teaching courseware, New People's Education Edition eighth grade physics PPT courseware for the second volume, eighth grade physics slide courseware download, work and mechanical energy PPT courseware download, work PPT courseware download, .ppt format
For more information about the "Work and Mechanical Energy" PPT courseware, please click on the "Work ppt Work and Mechanical Energy ppt" tab.
"Structure and Function of Cell Nucleus" PPT courseware on the basic structure of cells:
"The Structure and Function of the Cell Nucleus" PPT courseware on the basic structure of the cell Part 1: Pre-class independent study plan 1. Distribution and function of the cell nucleus 1. Distribution: Except for a few cells such as mature __________ of higher plants and ________ of mammals, eukaryotes...
"Structure and Function of Cell Nucleus" Basic Structure of Cells PPT:
"Structure and Function of Cell Nucleus" Basic Structure of Cells PPT Part One Content: Foundation of Essential Knowledge Literacy 1. Experiments to Explore the Function of Cell Nucleus 1. Black and White Axolotl Nuclear Transplantation Experiment: (1) Experimental Process: (2) Experiment Conclusion: The skin color of axolotl is affected by the cell nucleus.
"Structure and Function of Cell Membrane" PPT courseware on the basic structure of cells:
"Structure and Function of Cell Membrane" PPT courseware on the basic structure of cells Part 1: Independent preview 1. Function of cell membrane 1. Separate the cell from the external environment and make the cell a ________ system to ensure the relative stability of the cell ________. 2..