Lecture 2 - 1-Dimensional Kinematics, Speed, Velocity, Acceleration

Physics I; Classical Mechanics

MIT

This lecture is an introduction to kinematics which ultimately leads (in Lecture 4) to trajectories in three-dimensions. Professor Lewin begins with a description of one-dimensional motion of a particle. He talks about average velocity, the importance of + and - signs, and our free choice of origin. He moves into a conversation about average speed vs. average velocity, instantaneous velocity (reviewing when velocity is zero, positive, and negative), and instantaneous acceleration. He shoots a bullet through two wires, calculating the average speed from the distance between the wires and the elapsed time.

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