You mean [Newton's Laws of Motion](https://en.wikipedia.org/wiki/Newton%27s_laws_of_motion)?

1. A still object stays still and a moving object keeps moving in the same direction and speed, unless they get hit by an external force 
2. When an object gets hit by an external force, it will start moving in the direction of the force. The stronger the force, the faster its speed in that direction increases
3. If two object collide, they will exert forces on each other; these forces have the same strength and opposite direction

Let me know if you have trouble understanding and would like any clarification on the above
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