The physical meaning of "velocity"?

Speed is the speed of the object movement, that is, speed rate is the size of the speed or the change rate equivalent to the distance. It is called speed in junior high school physics, but it should be distinguished from the speed in senior high school physics

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1. What is the effect of velocity in physics When a physical object moves in a straight line at a speed of 0.1m/s under the action of tensile force, the friction force is 10N. If the object still moves in a straight line at a speed of 0.5m/s, what is the horizontal tensile force? How much is the friction force? Why? (excluding air resistance) Like this problem, the friction force and the pull force should be the same, both are 10N, but the speed is not determined by the pull force. The friction force has nothing to do with the speed, but the friction force is equal to the pull force, so what determines the speed
2. What is the definition of physical velocity
3. Give me some physics questions and answers (about distance, speed and time) For example, it takes someone 80 seconds to walk 100 meters, From the formula v = s / T =100m/80s =1.25m/s
4. The two trains run in opposite directions on two parallel straight rails. The length of train a is 150m, and that of train B is 200m. The speed of train a is 54km / h, and that of train B is 72km / h. how long does it take for the two trains to meet and stagger?
5. Know the distance ratio and time ratio of a and B objects, how to find their speed ratio
6. Velocity is a description of the motion of an object______ And sports_____ It can also be said to describe objects______ How fast and how slow is the change_______ The direction of change
7. Can speed, time and distance be negative
8. 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!
9. 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
10. 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
11. What is the physical meaning of speed
12. What is the meaning of period in physics? Why is 1 divided by frequency equal to period
13. The magnitude of velocity (velocity) is equal to the displacement value of an object in unit time, but it is also defined that the length of an object's trajectory is related to the time it takes So, what is the rate
14. According to this definition, if the velocity of an object increases from V1 to V2 in t time, the acceleration is V2 − v1t. An existing small ball starts to move at an acceleration of 3m / S2 for 2S, then the velocity of the small ball at the end of 2S is () A. 0B. 2m/sC. 3m/sD. 6m/s
15. Concept 1. Distance and time -- meaning 2. The physical quantity representing the motion of an object is numerically equal to that of the object passing through in-
16. What's the difference between acceleration time diagram and velocity time diagram
17. What's the secret of speed time chart in physics? Which questions must be drawn?
18. Picture a is the distance time image of a uniform linear motion. Please draw the speed time image of the object in picture B
19. The distance time image of an object moving in a straight line at a uniform speed is shown in Fig. (1). According to (1), the speed time image of the object moving in (2) is drawn Guidance and Practice
20. How to draw the distance time image according to the speed time image Let's not pass on the picture. Let's describe it orally: given that the speed time image is a line segment parallel to the time axis, how to draw the distance time image?