To lay the groundwork for understanding Galileo’s study of moving objects (and ulti- mately to understand the workings of the solar system), we have to begin with precise definitions of three familiar terms: speed, velocity, and acceleration. Speed and Velocity Speed and velocity are everyday words that have precise scientific meanings. Speed is the distance an object travels divided by the time it takes to travel that distance. Velocity has the same numerical value as speed, but it is a quantity that also includes information on the direction of travel. The speed of a car might be 40 miles per hour, for example, while the velocity is 40 miles per hour due west. Quantities like velocity that involve both a speed and a direction are called vectors. Velocity and speed are both measured in units of distance per time, such as meters per second, feet per second, or miles per hour. In equation form: velocity or speed (m/s) distance traveled (m) time of travel (s)
To lay the groundwork for understanding Galileo’s study of moving objects (and ulti- mately to understand the workings of the solar system), we have to begin with precise definitions of three familiar terms: speed, velocity, and acceleration. Speed and Velocity Speed and velocity are everyday words that have precise scientific meanings. Speed is the distance an object travels divided by the time it takes to travel that distance. Velocity has the same numerical value as speed, but it is a quantity that also includes information on the direction of travel. The speed of a car might be 40 miles per hour, for example, while the velocity is 40 miles per hour due west.ปริมาณ เช่น ความเร็วที่เกี่ยวข้องกับทั้งความเร็วและทิศทางเรียกว่าเวกเตอร์ ความเร็วและความเร็วมีทั้งวัดในหน่วยของระยะทางต่อครั้ง เช่น เมตร ต่อวินาที ฟุตต่อวินาที หรือไมล์ต่อชั่วโมง ในรูปแบบสมการความเร็วหรือความเร็ว ( m / s ) ระยะทางที่เดินทาง ( M ) เวลาเดินทาง ( s )
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