Question

Define impulse of a force and impulsive force.

Answer 1

Impulse of a force is the time integral of a force. Impulsive forces, on the other hand, are great forces acting on a body for a short period of time. It is defined as the rate of change of momentum of a body during the time of the application of the force.

Complete Step by step solution Impulse of a force is denoted with $J$ and is the difference in momentum, i.e.
$J = {F_{average}}\Delta t = m\Delta v$, where $v$ is the velocity of the body, $m$ is the mass of the body, and ${F_{average}}$ is the average force acting on the body during the time $\Delta t$.
The impulse of a force is also the integral of a force over a said period of time.
Impulsive forces are huge forces acting on a body for a short period of time causing drastic momentum changes.
Examples of impulsive force include Tension in a string. When in a pulley system, a sudden jerk force is given to any of the mass, then Tension can increase at once.
Tension can be classified as impulsive force since it can also produce jerk forces to balance the sudden changes in force on the block.
Normal reaction is another impulsive force since it comes into effect suddenly when we walk or run and thus helps the body to stay upright.
There are specific forces which can act as an impulsive force like tension, normal reaction, etc.

Note: Non-impulsive forces cannot increase suddenly since they are dependent on the height, displacement and other parameters of the body respectively. This means that the changes in these forces are not sudden thus not producing jerks. Examples of non-impulsive forces include gravitation force, spring force, etc.