The phrase "a first impact" is correct and usable in written English.
It can be used to refer to the initial effect or influence of something, often in contexts like research, analysis, or discussions about events.
Example: "The study aimed to assess a first impact of climate change on local ecosystems."
Alternatives: "an initial effect" or "a primary influence."
Mills, who made a first impact on England with some fiery spells in the four-day fixture against Essex that preceded the home Ashes series in July, could now be an unlikely contender for the third Test in Perth, if England decide that they need to fight fire with fire on the traditionally rapid Waca wicket.
Miller adds that as a first impact, rising seas contaminate freshwater resources.
Art is often about a first impact, and the experience is completely up to the individual.
And in many cases the condition began with a previous hit and a second impact was the lethal blow.
And then I feel a second impact of that tragedy, for the person who killed her, to have committed such an impulsive and awful act, to have to live with that.
However, as England pressed for victory in the closing stages, North suffered a second impact which looked far worse after accidentally clashing heads with his team-mate Richard Hibbard when the pair attempted to stop Mike Brown close to the line.
Individuals must also refrain from activities that could result in a second impact to the head or body, including activities such as playing sports, climbing on playgrounds, and riding bicycles.
"A second impact in less than 21 days 'NO'," he wrote.
Therefore, treatment for concussion essentially consists of a period of inactivity to minimize the probability a second impact will occur during the healing period.
A second impact attempt, in the event that the first impact is unsuccessful, can be added at the expense of a shorter launch window and increased (∼3x) spacecraft ΔV.
"Furthermore," he added, "if they continue to play while symptomatic, they are at risk for a second impact that can lead to severe disability and death.
