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At the instant physical contact or a collision occurred. The egg smashed upon impact with the cement. No, sir, the pilot died upon impact.
have an impact on (someone or something)
To affect or influence someone or something. Of course your decision has an impact on me—I'm your wife! Don't worry, your grade on that assignment has very little impact upon your overall grade for the semester.
impact (up)on (someone or something)
To affect or influence someone or something. Of course your decision impacts on me—I'm your wife! Don't worry, your grade on that assignment won't impact upon your overall grade for the semester.
See also: impact
have an impact on someone or something
to leave an impression on someone or something. The sharp change in interest rates had an impact on the housing market. Your story really had an impact on me.
impact (up)on someone or something
[for something] to have an effect on someone or something. (Upon is formal and less commonly used than on.) This plant closing will impact upon the local economy for years to come. The day's troubles impacted on Rachel quite seriously.
Fig. at the place or time of an impact. The car crumpled upon impact with the brick wall. The man who fell from the top of the building died on impact.
To have an effect on someone or something: The results of the election will impact on upcoming legislation.