# Difference between impulse and magnitude of force

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1. Jan 23, 2015

### Za Kh

we learned about the impulse of a force , but just then a question came to my mind , whats the difference between the magnitude of a force and its impulse , or are they the same ... ??

2. Jan 23, 2015

### Staff: Mentor

The magnitude of a (vector) force $\vec F$ is $|\vec F| = \sqrt{F_x^2 + F_y^2 + F_z^2}$. The impulse of the force when it acts for time $\Delta t$ is $\vec F \Delta t$.

3. Jan 23, 2015

### Za Kh

thanks !! :)

4. Jan 23, 2015

### Orodruin

Staff Emeritus
Impulse is the force integrated over time so impulse and force have different physical units. The force relates to the acceleration of an object through Newton's second law while the impulse relates to a total change of momentum over a given time.