How many vertical jumps does it take to jump off of a rotating merry-go-round (MGR)? The answer is hidden in the expression: rn = r0 (1 + β2)n/2. When you make a vertical jump on a train moving on a straight line at constant speed (inertial frame), you land on the same spot. Not so on a MGR!

1.
T.
Toepker
, “
Hang time and March Madness
,”
Phys. Teach.
57
,
203
(
March
2019
).
2.
Frames of Reference
,”
YouTube, Physical Science Study Committee, supported by National Science Foundation, Alfred P. Sloan Foundation, Ford Foundation (1960)
, https://www.youtube.com/watch?v=bJMYoj4hHqU.
3.
A. E.
Wilson
, “
Jogging on a carousel
,”
Phys. Teach.
49
,
570
(
Dec.
2011
). In his words: “The purpose of the article is to present the concepts involved at as low a level as possible so that as wide a range of physics students as possible could have a better understanding of just what it takes to jog on a moving carousel.”
4.
J.
Grossman
, “
Frames of reference in the classroom
,”
Phys. Teach.
50
,
548
(
Dec.
2012
).

Supplementary Material

AAPT members receive access to The Physics Teacher and the American Journal of Physics as a member benefit. To learn more about this member benefit and becoming an AAPT member, visit the Joining AAPT page.