What is impulse in physical science ​

In classical mechanics, impulse (symbolized by J or Imp) is the integral of a force, F, over the time interval, t, for which it acts. Since force is a vector quantity, impulse is also a vector quantity. ... A resultant force causes acceleration and a change in the velocity of the body for as long as it acts.

negatively charged object is  is an object that has an excess of negative electrons and its the circle with the this symbol "-" and a positively charged object  is an object that has an excess of positive electrons  its the circle with the this symbol "+" .

tip: just remember the circles with the + and - symbol