There are two types of people in this world.

One who compels and uses force to force you into doing things you don't like to do, either projects or any other stuffs. You will do it involuntarily.

Another type whom you can feel his sacrifice for the team, and you feel like contributing to the team. You feel like giving your very best shot because you feel guilty. These are the most genuine feeling that comes out from your deep heart, they are sincere hence you will do your part voluntarily and happily.

There's always difference between forces and be assertive but remains polite.