加速度 | 定義、事実、単位 | ブリタニカ

Acceleration | Definition, Facts, & Units | Britannica Ask the Chatbot Games & Quizzes History & Society Science & Tech Biographies Animals & Nature Geography & Travel Arts & Culture ProCon Money Videos acceleration Introduction References & Edit History Related Topics Images & Videos Quizzes Fun Facts of Measurement & Math Contents CITE verified Cite While every effort has been made to follow citation style rules, there may be some discrepancies. Please refer to the appropriate style manual or other sources if you have any questions. Select Citation Style MLA APA Chicago Manual of Style Copy Citation Share Share Share to social media Facebook X URL https://www.britannica.com/science/acceleration Feedback External Websites Feedback Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article (requires login). Feedback Type Select a type (Required) Factual Correction Spelling/Grammar Correction Link Correction Additional Information Other Your Feedback Submit Feedback Thank you for your feedback Our editors will review what you’ve submitted and determine whether to revise the article. External Websites UMass Amherst Libraries Open Books - Physics 131: What Is Physics? - Acceleration Physics LibreTexts - Acceleration OpenStax - College Physics 2e - Acceleration University of Michigan-Dearborn - Acceleration Loughborough University - Velocity and Acceleration Purdue University - Angular Velocity and Acceleration (PDF) The Physics Classroom - Acceleration University of Central Florida Pressbooks - Average and Instantaneous Acceleration Britannica Websites Articles from Britannica Encyclopedias for elementary and high school students. acceleration - Student Encyclopedia (Ages 11 and up) acceleration When runners change from a jog to a sprint, they are accelerating because the magnitude of their velocity is greater than it was a second before. (more) acceleration physics Ask Anything Homework Help Written and fact-checked by Britannica Editors Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Britannica Editors History Britannica AI Ask Anything Table of Contents Table of Contents Ask Anything acceleration , rate at which velocity changes with time, in terms of both speed and direction. A point or an object moving in a straight line is accelerated if it speeds up or slows down. Motion on a circle is accelerated even if the speed is constant, because the direction is continually changing. For all other kinds of motion , both effects contribute to the acceleration. Related Topics: accelerometer centripetal acceleration uniform acceleration instantaneous acceleration angular acceleration (Show more) On the Web: UMass Amherst Libraries Open Books - Physics 131: What Is Physics? - Acceleration (May 05, 2026) (Show more) See all related content Because acceleration has both a magnitude and a direction, it is a vector quantity. Velocity is also a vector quantity. Acceleration is defined as the change in the velocity vector in a time interval, divided by the time interval. Instantaneous acceleration (at a precise moment and location) is given by the limit of the ratio of the change in velocity during a given time interval to the time interval as the time interval goes to zero ( see analysis: Instantaneous rates of change ). For example, if velocity is expressed in metres per second , acceleration will be expressed in metres per second per second. The Editors of Encyclopaedia Britannica This article was most recently revised and updated by Erik Gregersen .