Frank L. H. Wolfs
Department of
Physics and Astronomy, University of Rochester, Slide 28
Measuring
velocity:
velocity = change in position/change in time.
velocity = change in position/change in time.
¥In 1 second I see the ball move 5 m. Its velocity is thus dx/dt = 5/1 = 5
m/s.
¥In 1 second I see observer 2 move 10 m. The velocity of observer 2 is thus
dx/dt = 10 m/s.
¥In 1 second I also see the ball move (10 + 5) = 15
m. Its velocity is thus dx/dt = 15 m/s.
¥The velocity I observe is higher than the velocity he
observes!
