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This video covers average speed using a basic example. It also introduces the most important problem solving strategy in physics.
The average speed is the distance (a scalar quantity) per time ratio. Speed is ignorant of direction. On the other hand, velocity is a vector quantity; it is a direction-aware quantity. The average velocity is the displacement (a vector quantity) per time ratio.
If the details of the motion at each instant are not important, the rate is usually expressed as the average velocity \(\bar{v}\). This vector quantity is simply the total displacement between two points divided by the time taken to travel between them.
31 mar 2023 · To calculate average velocity from displacement and time, first find the total displacement, which is the distance and direction between the starting and ending points. Then find the total amount of time spent, and convert it to seconds, which are the international scientific standard.
Explain the relationships between instantaneous velocity, average velocity, instantaneous speed, average speed, displacement, and time. Calculate velocity and speed given initial position, initial time, final position, and final time.
Calculate the average velocity given the displacement and elapsed time. When you’re in motion, the basic questions to ask are: Where are you? Where are you going? How fast are you getting there? The answers to these questions require that you specify your position, your displacement, and your average velocity—the terms we define in this section.
Calculate the velocity vector given the position vector as a function of time. Calculate the average velocity in multiple dimensions. Displacement and velocity in two or three dimensions are straightforward extensions of the one-dimensional definitions.
