No, lots of forces act on an object.
gravity
An object will accelerate if and only if there is a net force acting on the object.
Gravity.
Gravity must be the only force acting on the object, to produce downwards vertical acceleration. There is no force acting in the horizontal direction because there is no acceleration.
Gravity must be the only force acting on the object.
free fall
Gravity.
True (:
Any force will do. The only condition is that the TOTAL (or NET) force acting on an object is non-zero.
gravity (studyisland answer)
In free fall.
Such an object is said to be in free fall.