Use the information below to generate a citation. Then you must include on every digital page view the following attribution: Taking a as an acceleration,initial velocity as Vi, final velocity as Vf and t is the time interval, SI unit of acceleration is meter per second per second ms-2. If you are redistributing all or part of this book in a digital format, What is Acceleration formula We can find acceleration by the following formula and from Newton’s second law of motion. Then you must include on every physical page the following attribution: If you are redistributing all or part of this book in a print format, Changes were made to the original material, including updates to art, structure, and other content updates. Want to cite, share, or modify this book? This book isĪnd you must attribute Texas Education Agency (TEA).
You can calculate the elapsed time or the change in time, Δ t Δ t, of motion as the difference between the ending time and the beginning time Mentally, however, it is possible to imagine calculating average speed over. Because speed is a rate, it depends on the time interval of motion. Speed (velocity) is the rate of change of distance (displacement) with time. Like distance, speed is a scalar because it has a magnitude but not a direction. Speed is the rate at which an object changes its location. In this section we will look at time, speed, and velocity to expand our understanding of motion.Ī description of how fast or slow an object moves is its speed. Questions such as, “How long does a foot race take?” and “What was the runner’s speed?” cannot be answered without an understanding of other concepts. There is more to motion than distance and displacement. After they share their ideas, follow up with questions that deepen their thought process, such as: Why do you think that? What is an example? How might apply these terms to motion that you see every day? Speed Ask them to speculate about ways that speed is different from velocity. Explain to students that velocity, like displacement, is a vector quantity. Tell students that they will learn about these differences as they read the section. Explain that these words are often used interchangeably in everyday life, but their scientific definitions are different. that the definition of average acceleration looks a lot like the slope formula.
Movement can be shown in distance-time and velocity-time graphs. The average speed of an object over some time interval is given by. Acceleration is change in velocity divided by time. Then ask them if they have heard the word velocity used. Average speed is distance divided by time.
Before students read the section, ask them to give examples of ways they have heard the word speed used. In this section, students will apply what they have learned about distance and displacement to the concepts of speed and velocity.