The Physics
Hypertextbook
Opus in profectus

Centripetal Force

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Summary

Ways to accelerate
A force that is… will make a moving object… or…
parallel
to velocity
change speed (speed up) accelerate (in the usual sense of the word)
antiparallel
to velocity
change speed (slow down) decelerate (which is just another way to accelerate)
perpendicular
to velocity
change direction (turn) accelerate centripetally (which is also just another way to accelerate)