1.) When you push 2 crates having different masses with the same amount of force, you will realize that the crate with the smaller mass moves faster then the crate having the greater mass.
2.) When you are running with your friend who is heavier than you, you will realize that your friend runs slower than you and that is because he is heavier. Weight is directly proportional to mass.
3.) When you pull a heavy box and a light box with a constant force, you will observe that the light box moves faster than the heavy box.