noun

the action of one object coming forcibly into contact with another.

there was the sound of a third impact

collision,crash,smash,clash,bump,bang,knock,jolt,thump,whack,thwack,slam,smack,contact

verb

come into forcible contact with another object.

the shell impacted twenty yards away

crash into,smash into,collide with,be in collision with,hit,strike,ram,smack into,slam into,bang into,cannon into,plough into,meet head-on,dash against