You are walking down the hallway and your mean little brother sticks his foot out to trip you. You don't notice and land- SPLAT! - sprawled out on the floor.
Based on the laws of motion, why did you fall?

3rd Law: Action- brother sticks out his foot. Reaction- you fall.

2nd Law: You weigh more than your little brother, so you had more acceleration.

4th Law: Little brothers are always mean.

1st Law: Your body was an object in motion and stayed in motion. Since the force stopped only your feet, the rest of your body kept going and fell.