I like to move back and forth on black sock went i am wiggled
The particles in a solid move back and forth in place.
"Oscillate" means to move back and forth in a regular rhythm.
the particles in a surface water move back- and- forth only.
solids
solid
back and forth?
solid
solids
move back and forth in a circuit. :)
The planets orbit AROUND the sun, so technically not back and forth.
move your body back and forth and keep your feet on the ground
move your hand back and forth!