Increasing speed, decreasing speed, and change of direction
Only one thing can be acceleration; the changing velocity of any given object. That's what acceleration is. Acceleration is caused by a net force on the object.
changing direction, speeding up, and slowing down
Lots of things. You have not given enough information to answer the question. First please describe what you mean by "acceleration problems".
positive acceleration is when things speed up; negative acceleration is when things slow down; and zero acceleration is when things do not speed up or slow down, this is called constant speed, or no change in velocity.
acceleration= force/mass and also change in direction,speed are acceleration
"The rule of three" means that things often occur in groups of three.
No. A negative acceleration could mean a change in direction
If you mean acceleration due to gravity it is ~9.8m/s2
I am not sure what you mean by reversing a zero acceleration. An object's acceleration can, of course, change over time.
You can't convert acceleration to speed or vice versa, if that's what you mean, since they are really quite different things. Acceleration is defined as the rate of change of velocity (dv/dt); therefore it has units of speed / time, or equivalently, distance / time squared.
There are three thing that must be present for an car to work properly1. compression 2.fuel supply 3.ignition. There are many things that control these three things and all three items can make the car of the era run poorly and sometimes it will not run at all.
In that case, you have all three - speed, acceleration, velocity.