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Speed and Velocity in Physics

Learn about speed, velocity, distance, displacement, and how to calculate them with examples. Understand the concepts of average and instantaneous speed. Instantaneous speed and velocity explained for better comprehension.

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Speed and Velocity in Physics

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  1. Speed/Velocity • Distance- the length of a path between two points. • Displacement- the length and direction that an object has moved from its starting point. X Distance Displacement X

  2. Xf X0 Speed: A position change in a certain amount of time. Speed = distance / time or v = d/t - usually measured in m/s Average Speed: d/t, where d is the total distance and t is the total time elapsed.

  3. Example- A jogger jogs 2 km in 10 min. Calculate the speed. Given: Distance = 2 km Time = 10 min Find: Speed Solution: S = d / t S = 2 km /10 min S = .2 km/min

  4. Instantaneous Speed: The speed at a particular instant (this quantity is what a speedometer measures).

  5. Velocity: Tells you how fast and what direction something is moving. Velocity = displacement/time, plus the direction (north, south ... etc.) v = d /t

  6. Slope = rise/run =distance/time = speed Distance (m) XFinal XInitial Time (min) d d d d 3 2 1 3 2 1 3 2 1 3 2 1 0 1 2 3 4 5 t t 0 1 2 3 4 5 0 1 2 3 4 5 0 1 2 3 4 5 t t NOT MOVING Moving away at a constant speed Moving back at a constant speed Not possible!

  7. d t Instantaneous Speed

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