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Why is the instantaneous velocity the instantaneous velocity and the average velocity not the average velocity? I hope I can explain it clearly and understand it easily
Speed is scalar and has no direction. Speed is vector and has direction. For example, an object moves from point a to point B along a straight line with V speed, and then from point B to point A. in this process, the magnitude of any instantaneous speed is equal to the magnitude of instantaneous speed, and the average speed is equal to the distance divided by T, the distance is equal to V multiplied by T. The average speed is V, the average speed is equal to the displacement divided by T, and the displacement is 0, so the speed is also 0
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- 1. The instantaneous speed of high school physics is usually called speed. The average speed is distance / time. I know. How to calculate the speed
- 2. One question is like this One person climbs the mountain, climbs to the top of the mountain from the foot of the mountain, and then returns to the foot of the mountain along the original road. The average speed up the mountain is V1, and the average speed down the mountain is v2. What is the average speed and average speed of the round trip? How to express it? In addition, when the person goes up and down the mountain, the displacement is 0. When the position changes, the average speed is 0. Is that wrong? What's the difference between the two? I know that velocity is a vector and has direction of magnitude. Velocity is only a scalar, regardless of whether it is round-trip or not
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- 5. The product of multiplication of three numbers is equal
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- 10. One passenger train is 190 meters long and the other freight train is 290 meters long. What is the speed ratio between passenger train and freight train 5: 3. When driving in the same direction, the time for two vehicles to cross is 1 minute. Ask them about driving in opposite directions, what is the time for two vehicles to cross?
- 11. How to distinguish the speed and instantaneous speed
- 12. Why can only instantaneous velocity accurately describe the speed of a moving object with variable speed?
- 13. What is the speed of motion in physics no
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- 15. The following is true A if the instantaneous velocity of an object at any time in a certain period of time is equal to 0, then its average velocity in this period of time must be equal to 0 B if the average velocity of an object in a certain period of time is equal to 0, then its instantaneous velocity at any time in this period of time must be equal to 0 C in uniform linear motion, the average velocity of an object in any period of time is equal to its instantaneous velocity at any time, In D variable speed linear motion, the average velocity of an object in any period of time is not equal to its instantaneous velocity at any time
- 16. In the 2008 Beijing Olympic Games, Jamaican bolt (as shown in the picture) is a recognized flying man in the world. He broke two world records and won two gold medals in the men's 100m final and men's 200m final by 9.69s and 19.30s respectively A. The displacement in the 200m final is twice that in the 100m final. B. the average speed in the 100m final is about 10.32m/s. C. The average speed in the 200m final is about 10.36m/s. D. the maximum speed in the 100m final is about 20.64m/s
- 17. I seem to understand the difference between the instantaneous speed and the average speed, but I still have some doubts. For example, the speed of the train after speed increase is 150km / h. I think I can also see that the speed of the train at a certain point of displacement is 150km / h. how to explain this and how to deal with this type of problem
- 18. It takes 5 seconds for the car to stop from braking. During this period, the distance of the car before 1 second is 9 m, 7 m, 5 m, 3 m and 1 m respectively Ask: the average speed of the car in the first 1s, the first 2S, the first 3S, the first 4S and the whole journey. Which of the five average speeds is closest to the instantaneous speed when the car closes the throttle? Is it slightly larger or smaller than this instantaneous speed? We must answer it!
- 19. Can speed, time and distance be negative
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