Why does this happen?

This happens because things move when you push or pull them, just like when you slide a toy across the floor.

Imagine you're playing with your favorite block on the table. When you give it a gentle nudge, it starts to roll, and keeps rolling until something stops it, like the edge of the table or another block. That's motion in action!

When you push the block, you're giving it energy, just like when you jump on your bed, you give it energy, and it bounces back! The block keeps moving because it wants to keep going, but eventually, it slows down and stops. That's because of something called friction, it's like a quiet whisper from the table saying, "Come on, slow down."

If you put your hand in front of the rolling block, it will stop suddenly. Your hand is like a big friend who says, "Hey, I'm going to catch you!" That’s called force, and it helps explain why things start, stop, or change direction, just like when you play tag and get tackled!