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Authoritative PPT Summary
"The Speed of Work" Machinery and Human PPT Courseware
think about it
(1) What are the two necessary factors for doing work? Give two examples of work being done and work not being done.
(2) The formula and unit of work.
How to compare the speed of exercise?
Method 1: The time taken is the same, the longer the distance the faster
Method 2: Traveling the same distance in less time is faster
Method 3: Look at the distance traveled per unit time
How to compare the speed of work?
Method 1: It takes the same time, and the one who does more work will do it faster.
Method 2: To do the same work, the one that takes less time will do it faster.
Method 3: Look at the work done per unit time
power
1. Definition: The ratio of the work done in a period of time to the time used to do the work is called power.
2. Expression: Power=work/time, that is, P=W/T
3.Unit
SI unit: Watt, symbol W
1W＝1J/s
Commonly used units: kilowatt (k W)
1 kilowatt = 1000 watts
Note: The symbol of work is W, and the symbol of power unit is W.
practice
1. The ratio of the work done in a period of time to the time spent doing the work is called power.
Its formula is ________, and the unit of power is ____.
2. What is the physical meaning of power 70W? Which one has greater power, 70W or 450W? Which one does the work faster? Which one does more work?
A power of 70W means that the machine has done 70J of work in 1 second.
450W has greater power than 70W and works faster.
450W＝450J/s, 70W＝70J/s
3. When using machinery to perform work, which of the following statements is correct: ( )
(A) A machine with high power must do more work than a machine with low power;
(B) A machine with high power must take less time to do work than a machine with low power;
(C) A machine with low power must do work slower than a machine with high power;
(D) None of the above statements are correct.
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