Ми їдемо на північ.

Ми means we.

You do not always have to include it, because the verb ending -емо in їдемо already shows we. So:

• Ми їдемо на північ.
• Їдемо на північ.

Both can work.

Including ми can make the subject clearer or slightly more emphatic.

Because їхати / їздити is used for going by some kind of transport, while йти / ходити is used for going on foot.

So:

• Ми їдемо на північ. = We are going north by vehicle / transport
• Ми йдемо на північ. = We are going north on foot

English go does not always show this difference, but Ukrainian usually does.

Not necessarily.

Їдемо means we are going by transport. It can be:

• driving
• riding
• traveling by car
• going by bus, train, etc.

It does not automatically mean that the speakers themselves are the driver. It is broader than English we are driving.

It is present tense.

From the imperfective verb їхати, їдемо literally means we are going / we are traveling.

Depending on context, English might translate it as:

• We are going north
• We’re heading north
• We’re traveling north

Present tense motion verbs in Ukrainian are often used for something happening now or in the current situation.

With compass directions, Ukrainian commonly uses на to mean toward a direction:

• на північ = northward / to the north
• на південь = southward
• на схід = eastward
• на захід = westward

So Ми їдемо на північ literally feels like We are going toward the north.

This is just the normal Ukrainian pattern for direction.

Here північ is in the accusative case, because на often takes the accusative when there is movement toward somewhere.

So:

• на північ = toward the north

A useful contrast is:

• на північ = to the north / northward
• на півночі = in the north / in the northern area

So movement uses one form, while location uses another.

Good question. Північ is a feminine noun, and in this pattern its accusative singular looks the same as its nominative singular.

So even though the case changes grammatically, the word form stays:

• nominative: північ
• accusative: північ

That is why you do not see a visible change here.

No. Північ can also mean midnight.

For example:

• на північ = northward / to the north
• опівночі = at midnight

In your sentence, the meaning is clearly north, because of the motion context.

The letter ї is pronounced roughly like yi.

So їдемо sounds approximately like YI-de-mo.

A rough pronunciation of the whole sentence is:

• Ми = my (like mih with a short i sound, not English my exactly)
• їдемо = YI-de-mo
• на північ = na PIW-nich

A rough full pronunciation: My YI-de-mo na PIW-nich

The stress is usually:

• ї́демо
• пі́вніч

No. Ukrainian has no articles like English a or the.

So північ can mean:

• north
• the north

The exact meaning depends on context.

That is completely normal in Ukrainian.

Yes. Ukrainian word order is fairly flexible.

The neutral order here is:

• Ми їдемо на північ.

But other orders are possible for emphasis, for example:

• На північ ми їдемо. = It is north that we are going.
• Їдемо ми на північ. = more marked, depending on context

For learners, the original version is the safest and most natural neutral choice.