После удара на экране телефона появилась трещина.

Because после requires the genitive case.

• удар = impact / hit
• Genitive singular: удара

So:

• после удара = after the impact / after the hit

This is a very common pattern in Russian:

• после урока = after the lesson
• после работы = after work
• после дождя = after the rain

Удара is the genitive singular form of удар.

The basic noun is:

• удар = a hit, blow, strike, impact

In this sentence, it most naturally means an impact or a hit to the phone, not necessarily a person physically punching it. So the phrase suggests that the phone was struck or dropped and, as a result, the screen cracked.

This part literally means on the screen of the phone.

It breaks down like this:

• на экране = on the screen
• телефона = of the phone

Grammar:

• на with location usually takes the prepositional case
• экран becomes экране
• телефон becomes телефона because it shows possession, so it is in the genitive case

So:

• на экране телефона = on the phone’s screen / on the screen of the phone

Yes, absolutely.

• на экране телефона = on the phone’s screen
• на телефонном экране = on the phone screen

Both are natural. The version with телефона is a noun+noun structure, while телефонном uses an adjective.

Sometimes на экране телефона can sound a little more concrete, as if you are talking about a specific phone’s screen.

Because the subject is трещина, and трещина is a feminine singular noun.

In the past tense, Russian verbs agree with the subject in gender and number:

• masculine: появился
• feminine: появилась
• neuter: появилось
• plural: появились

So:

• трещина появилась = a crack appeared

Even though трещина comes at the end of the sentence, it is still the subject, and the verb agrees with it.

Both are possible, but the word order changes the emphasis.

• Появилась трещина puts focus on the appearance/result: a crack appeared.
• Трещина появилась sounds more neutral or may put slightly more emphasis on the crack itself.

Russian word order is more flexible than English. In this sentence, the chosen order sounds natural because it presents the event first and then introduces what appeared.

Here появилась means appeared.

It comes from the verb появиться, which is perfective. Perfective verbs usually describe:

• a completed event
• a single result
• something that happened as a whole

That fits this sentence well: after the impact, a crack appeared.

If you used the imperfective появлялась, it would suggest repeated appearance, a process, or some special context, which would not fit well here.

Both can describe a similar situation, but they focus on different things.

• появилась трещина = a crack appeared
• экран треснул = the screen cracked

The first focuses on the crack as a visible result. The second focuses on the screen undergoing the action.

So Russian can describe the event from either angle.

Russian does not have articles like a and the.

So nouns like телефона, экране, and трещина appear without articles, and the listener understands the meaning from context.

That means:

• появилась трещина can mean a crack appeared or the crack appeared, depending on context

In this sentence, English would normally use a crack appeared.

Yes. Трещина is the standard word for a physical crack.

Examples:

• трещина на стекле = a crack in the glass
• трещина в стене = a crack in the wall
• трещина на экране = a crack on the screen

So this is exactly the expected word here.

Yes, that is grammatically correct.

Russian allows different word orders, so all of these are possible:

• После удара на экране телефона появилась трещина.
• После удара трещина появилась на экране телефона.
• Трещина появилась на экране телефона после удара.

But they do not sound exactly the same. The original sentence is very natural because it sets the scene first:

1. После удара = after the impact
2. на экране телефона = on the phone screen
3. появилась трещина = a crack appeared

This order feels smooth and descriptive.

Because Russian normally says на экране for something visible on a screen or located on the surface of a screen.

Compare:

• на экране = on the screen
• в экране would usually sound wrong in this meaning

For cracks, scratches, and images, Russian typically uses на:

• царапина на экране = a scratch on the screen
• изображение на экране = an image on the screen
• трещина на экране = a crack on the screen

It could in theory, because удар can mean a blow or a strike, but in this context it is usually understood more broadly as after an impact.

For a phone, native speakers would most likely imagine something like:

• the phone was dropped
• it hit something
• it got knocked
• something struck it

So the phrase is best understood as after the impact rather than specifically after someone punched it.