Is this a serious question? Cuz' lots of things do.
:p
An Oscillating motion is one that moves forwards and backwards in an arc or circle repeatedly.
vibrations
Forcing backwards will result on a impulse forwards.
negative
Vibrating or maybe fluctuating. Pulsating may describe it too.
The atoms of the particular medium in which the sound is produced moves backward and forwards in sound.
A swing!
The truck is heavier
no bird can only move backwards! only a hummingbird has the ability to move backwards but it also moves forwards and left to right!
An Oscillating motion is one that moves forwards and backwards in an arc or circle repeatedly.
backwards
vertical
Words that are the same forwards and backwards are called palindromes.
None are but what cities/towns are spelled the same backwards and forwards?
You skip backwards when you jerk.
a ton. ton backwards is not
forwards