This video quickly explains what the heck impulse is, how it is related to momentum, and how all that is similar to work & energy.
Impulse vs Work: How to Know Which to Use?
Unfortunately for you, momentum and energy are always on the same exam. Why is that a bummer? Because the problems look almost EXACTLY the same. And yet if you try and solve an impulse problem with work and energy - or a work and energy problem with impulse - you will find yourself in a world of kinematic hurt. So this video focuses on only one thing: the easy way to spot which problem is which.
If you do not have an account, you should get one, because it is awesome! You can save a playlist for each test or each chapter, and save your "greatest hits" into a "watch right before the final" list (not that we recommend cramming, but when in Rome...)