What happens to the acceleration of and object if the net force that acts on it triples in magnitude?

Acceleration will also be three times.

Explanation:

According to Newton’s 2nd law of motion:

F = ma        ………. (i)

Where,  

F = force applied on the object  

m = mass of object  

a = acceleration of object

From equation (i) it is cleared that for a constant mass, force is directly proportional to acceleration. So, if force is increased 3 times then acceleration will also increase 3 times.  

it becomes positively charged by charging it

a straight line sloped