In a Saturn V, initial acceleration was barely beyond 1g.

$\begingroup$ All rockets do launch vertically, to escape atmosphere. Why are most rockets launched from the east coast of countries? Rockets launched to reach orbit usually start from a stationary position, engines are started and the rocket slowly gain acceleration upwards, eventually reaching orbit. And it's obviously much more efficient to have the engines pointing straight down so that the rocket travels straight up, instead of wasting thrust by travelling horizontally along a runway. A vertical launch system can be either hot launch, where the missile ignites in the cell, or cold launch, where the missile is expelled by gas produced by a gas generator which is not part of the missile itself, and then the missile ignites. Following the launch, the rocket’s climb is initially slow; but by the end of the first minute into the ascent, the rocket is moving at a staggering 1,000 mph (1,609 kmph). Some small rockets are launched at non-vertical angle. Now since Earth is rotating towards East, you can save fuel by launching with Earth's rotation, preserving the eastward velocity you already have. Vertical takeoff requires disposable rockets (would it a satellite rocket), which is a money loss, and also a lot of fuel, because initial velocity is zero.
That is why they take off diagonally (or, alternatively, why they flail their wings wildly through the air in order to take off vertically). Tilt it even slightly from the vertical and it will collapse. As mentioned above, structural integrity is the other key reason rockets are launched vertically. What I'm thinking is that the rocket "wastes" a few seconds reaching a speed/acceleration that could be gained by other means. Aircraft are called "aircraft" because they require a lifting force provided by their motion through the air that opposes gravity. Short answer: Launching a rocket from the east coast gives an additional boost to the rocket, due to the rotational speed of Earth. Besides the good answers you already got, note that for a rocket to launch diagonally you need the vertical acceleration to be more than 1g. Short answer: Launching a rocket from the east coast gives an additional boost to the rocket, due to the rotational speed of Earth. Notice please where Cape Kennedy is, Russia’s launch sites, and China’s too (althought I am not sure exactly where they are, I bet they are on the east coast of China somewhere. Why rockets are launched vertically? Rockets are launched vertically with a tremendous amount of upward thrust, thanks to their own engines and the solid boosters attached to them (which are jettisoned soon after the launch). More rocket fuel means more mass which means larger engines which means more mass and the need for — more rocket fuel. The following photos show what an aircraft's jet engine can do to runaways when used carelessly, or in the case of a poorly built runway, a large rocket engine would be orders of magnitude worse. Also, these rockets travel eastward, so if anything goes wrong during their ascent, the debris would essentially fall into an ocean’s waters, far away from densely populated areas. So here’s what happens. Why are most rockets launched from the east coast of countries? It takes rocket fuel to launch rocket fuel, and the size of the craft increases quadratically to the payload to launch because of the extra fuel that is needed to launch the extra rocket fuel.

Also vertical takeoff seems risky, involves huge pieces of equipments, launch pads, to diminish risk. There are also huge engineering issues. Short answer: They don’t. Also, these rockets travel eastward, so if anything goes wrong during their ascent, the debris would essentially fall into an ocean’s waters, far away from densely populated areas.

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Rockets don't have wings, so all their lift must be provided by the thrust from their engines. But they pitchover to the horizon as soon as possible, in a long arc called a Gravity turn.