Question

Question #593cb

Answer 1

Force `(vecF)`is a push or a pull and is measured in Newtons (N)

Impulse `(vec I)`gives a measure of how long the force acts on the objects and is equal to the change in momentum brought about.
Its units is hence either `N.s or kg.m//s`

From Newton's 2nd Law of Motion, the resultant force acting on an objects is equal tot he rate of change of momentum brought about, ie
`sum vecF=(dvecp)/(dt)=d/dt(mvecv)`
Hence `vecFdt = vecI = m d vecv`

Answer 2

The impulse gives you the average over time of a rapidly varying force.

Explanation:

Consider a force `F(t)` not constant but function of time such as the one experienced by an object (tennis ball) during an impact:
The force varies rapidly between two instants `t_1` and `t_2` so that:

where `F_m` is the mean value of the force so that the grey square area is equal to the red total area under the original curve.