impact

the striking of one body against another

a forceful consequence; a strong effect; "the book had an important impact on my thinking"; "the book packs a wallop"

influencing strongly; "they resented the impingement of American values on European culture"

the violent interaction of individuals or groups entering into combat; "the armies met in the shock of battle"

press or wedge together; pack together

have an effect upon; "Will the new rules affect me?"