Answer:
Acceleration increases if force applied increases
Acceleration decreases if mass of the object increases
Step-by-step explanation:
The relationship between mass, acceleration and force applied on an object is described by Newton's second law:

where
F is the net force applied
m is the mass of the object
a is the acceleration
We can rewrite the equation as

So we notice that:
1) acceleration is proportional to the force: therefore, if the force applied increases, the acceleration increases as well
2) acceleration is inversely proportional to the mass: therefore, if the mass of the object increases, the acceleration will decrease