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"Power" Work and Mechanical Energy PPT Courseware 3
There is a batch of bricks to be transported to a newly built building. What are the methods?
Method 1: Porters move in batches, which takes 3 hours;
Method 2: Use a crane to lift, it takes 1 minute;
Method 3: Use two cranes to lift, taking 30 seconds.
teaching objectives
1. Knowledge and skills
Understand the concept of power.
Understand the concept of power with examples.
Learn how power is used in real life.
2. Process and methods
Understand the physical meaning of power through observation.
3. Emotional attitudes and values
Have a thirst for scientific knowledge, be willing to explore natural phenomena and physical principles in daily life, and have the awareness to apply science and technology to daily life and social practice.
power
1. Physical meaning:
The work done per unit time.
A physical quantity that represents how quickly an object does work.
2. Formula: P=W/t
3. Unit:
power unit
SI unit: Watt, symbol W
1W=1J/s
Common units: kilowatt (kW), megawatt (MW)
1 KW=103 W 1 MW=106 W
Judgment: Does doing fast work necessarily mean doing more work?
uncertain! The speed of doing work is not determined by how much work is done!
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