Or the distance traveled per unit time is called speed.
2. Speed unit: m/s Reading: m/s indicates how many meters are driven per second.
M/min is pronounced as: m/min indicates how many meters each branch is.
Km/h is pronounced as: Km/h indicates how many kilometers are driven per hour.
Error-prone: 53 km/h Reading: (Wrong way) 53 km/h.
Cause of error: Chinese characters are applied to numbers.
Error 2: 53 kilometers per hour
Correctly read: 53 kilometers per hour
Say: 53 kilometers per hour.
The car travels 20 1 km in 3 hours, and the speed is () per hour.
Judgment: Kangaroos run 276 kilometers in 4 hours, and the speed of kangaroos is 69 kilometers. (×)
(Wrong speed unit)
Little Dingding walks every minute1000m. (×)
People walk at a speed of about 4 kilometers per hour or 66 meters per minute. (Book p 1 1)
3. At the same time, whoever walks more distances will be faster.
At the same distance, whoever uses less time will be faster.
Error-prone question: Judgment: In a race between two people, whoever runs more distances will run faster. (×)
(Lack of premise: at the same time)
4, the relationship between speed, time and distance:
Speed = Distance/Time Distance = Speed × Time/Time = Distance/Speed
Can flexibly use the relationship between the three to solve related application problems.
Note: when comparing who is faster, you can calculate their respective speeds first and then compare them.
After solving the application problems, pay attention to correctly writing the name of the unit and answering the questions.
Error-prone: A: You can run 8 meters per minute. ×
It repeats every minute, 8 meters per minute.
A hippopotamus runs at a speed of 13 meters per second, so how far can it run at 1 minute?
(Note that the time unit is converted first, and the unit obtained is the distance unit. )