# Seatbelts and Newton's Laws of Motion

In: Science

Submitted By jkcrmchl
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Newton’s laws of motion are very helpful when it comes to supporting the usage of seatbelts in a vehicle. The first law of motion (also called the law of inertia) states that objects in motion tend to stay in motion. Objects at rest tend to stay at rest. Basically, objects want to keep doing whatever it is they are already doing. So if you’re driving down the road at 65 miles per hour, it’s not just the car going 65. It’s you too. If you’re both going 65mph and something abruptly stops your car (like a tree), something needs to also abruptly stop you so that you don’t go flying out of your car through the windshield at 65mph. that’s where seatbelts come in, they keep you attached to the vehicle.
Newton’s second law, which gives the formula F=ma (force is mass times acceleration) explains why the vehicle is in motion. The mass of you and the car are multiplied by the acceleration of the car and you get the amount of force that is needed to propel you down the interstate at 65mph.
The third law states that for every action there is an equal and opposite reaction. When the tree jumps out in front of your car and your car hits it, the tree is also hitting your car. The same can be said about your body hitting the seatbelt; the seatbelt is also hitting your body.

Harris, William. "How Newton’s Laws of Motion Work" 29 July 2008. HowStuffWorks.com. Retrieved from 14 June…...

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