Forces and laws

First law;
Things in motion will stay in motion and keep going until another force stops or acts on it.

Second law;
Force = mass times exelartaion .. heavier things go slower and slower things go faster when the same amount of force is acting on it.

Example;
2 skates one is heavier than the other so when you push both with the same amount of force the lighter one will go further unlike the heavier one.