Need help giving examples regarding momentum

[notyourmother]

I need help thinking of examples for these 3 situations:

1. an object with zero momentum that has a net force on it
   
2. an object with downward momentum that is changing in the upward direction
   
3. an object has a net force on it but no energy change

Any help would be appreciated!

 

[Simon Bridge]

Welcome to PF;

I need help thinking of examples for these 3 situations:

1. an object with zero momentum that has a net force on it
   
2. an object with downward momentum that is changing in the upward direction
   
3. an object has a net force on it but no energy change

Any help would be appreciated!

A net force implies acceleration... but certainly a change in momentum.
You have a bunch of equations to do with energy and momentum don't you? Try listing them and see if you notice anything.

Taking them in order - hints:
* you have an equation for momentum: under what circumstances is the momentum zero?
* again from the equation - which part affects the direction? Which part has to change for the change to be in a different direction?
* isn't there a special law to do with energy?