Slap
A slap was a strike with the open palm of one's hand.
Slaps could be part of an assault.
Slaps could also be an effective method of snapping someone out of an altered behavioral state. In 2268, Doctor Joseph M'Benga slapped Spock on the face to end the Vulcan's attempt at self-hypnosis. (TOS: "A Private Little War")
In 2366, an unusually-angry Doctor Beverly Crusher slapped her son Wesley Crusher for not attending a concert being held. She later confided to Counselor Deanna Troi that she would never hit him. It was later discovered that Ambassador Sarek had been infected with Bendii Syndrome, causing his suppressed emotions to affect the behavior of other crew members. (TNG: "Sarek")