Question

what is an impulsive force

Answer 1

Force that acts for a short period of time is called Impulsive force.

Impulse J = impulsive force x short period of time dt.

Example:

The force used to dig a nail into the wall. the force applied here is impulsive force.

Answer 2

the force that two colliding bodies exert on one another acts only for a short time, giving a brief but strong push. this force is called impulsive force. it is defined as the rate of change of momentum.
impulsive force=impulse/time