Remember it's the law - the law of inertia.įor more information on physical descriptions of motion, visit The Physics Classroom Tutorial. Now perhaps you will be convince of the need to wear your seat belt. Once they leave the car, the passengers becomes projectiles and continue in projectile-like motion. Assuming a negligible amount of friction between the passengers and the seats, the passengers would likely be propelled from the car and be hurled into the air. If the car were to abruptly stop and the seat belts were not being worn, then the passengers in motion would continue in motion. The animation below depicts this scenario. Yet, if the seat belt is not used, the passengers are more likely to maintain its state of motion. The use of the seat belt assures that the forces necessary for accelerated and decelerated motion exist. As the car accelerates, the passengers accelerate with it as the car decelerates, the passengers decelerate with it and as the car maintains a constant speed, the passengers maintain a constant speed as well.īut what would happen if the passengers were not wearing the seat belt? What motion would the passengers undergo if they failed to use their seat belts and the car were brought to a sudden and abrupt halt by a collision with a wall? Were this scenario to occur, the passengers would no longer share the same state of motion as the car. Being strapped tightly to the car, the passengers share the same state of motion as the car. Any passengers in the car will also be decelerated to rest if they are strapped to the car by seat belts. These laws can be paraphrased as follows: A body remains at rest, or in motion at a constant speed in a straight line, unless acted upon by a force. Upon contact with the wall, an unbalanced force acts upon the car to abruptly decelerate it to rest. v t e Newton's laws of motion are three basic laws of classical mechanics that describe the relationship between the motion of an object and the forces acting on it. Visit Circular and Satellite Motion Interactives. Explore universal gravitation, gravitational field strength, the value of g, and your weight on other planets with our many other out-of-this-world Interactives. Launch the Gravitation Interactive and discover the universal law of gravitation. Consider for instance the unfortunate collision of a car with a wall. Study Keplers laws with the Orbital Motion Interactive. In fact, the tendency of moving objects to continue in motion is a common cause of a variety of transportation injuries - of both small and large magnitudes. The law of inertia is most commonly experienced when riding in cars and trucks. In the absence of an unbalanced force, an object in motion will maintain its state of motion. All objects resist changes in their state of motion. It is the natural tendency of objects to keep on doing what they're doing. Multimedia Studios » Newton's Laws » Newton's Law of Inertia - The Car and The WallĪccording to Newton's first law, an object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
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