 Hello and welcome back to another episode of Physics Partner. Today we are going to discuss the first law of motion famously known as Newton's first law of motion. Newton's first law says that an object at rest will remain at rest and an object in motion will remain in motion with the same speed in the same direction unless acted upon by an external force. This means that for an object to change its state of motion, something must act upon it. Let's take examples of this law in our daily lives. Have you ever wondered why objects don't move unless you act upon them? This is because of the first law of motion, this is also called inertia. For example, a park car will not move unless an external force like pushing or pulling is applied to it. Another example is a book laying on a table. It states there unless an external force is applied to it. In fact, every object we see around us is following this law unless there is an external force acting upon them. You must have observed that when you throw a ball on a smooth surface, it stops after some time. This is because of the first law of motion. The ball keeps moving until an external force, in this case friction opposes its motion and stop it. This law also explains why seat belts are important when you are in a vehicle. When a car suddenly stops, the passenger continues to move at the same speed but in the opposite direction. This sudden change in motion can cause serious injury or even death. The seat belt supplies an external force that stops the passenger motion before any damage is done. To sum up, Newton's first law of motion is an important concept that we come across every day. Objects at rest stay at rest. An object in motion is staying motion until an external force acted upon them. So I think it's enough for today.