Newton's Law of Motion
Please read what I post below, and tell me what you agree/disagree. Like/dislike about it. Please be nice what writing about this. Make sure you understand the physics involved. Discussion 1; If we think of ourselves sitting in a car that is travelling with an amount of velocity and acceleration. Our car slams into the back of another car, either moving with less or no velocity and/or acceleration than our's, our bodies which are fastened to the car via a seat and seat belt, accelerate forward during that moment of impact. The transfer of force from the collision imparts an equally proportionate force on us as we are part of the car. Along with our bodies, our head also accelerates forward during impact. Due to the elasticity in the muscle and ligaments in our neck, we create an opposing force to quickly stop the acceleration and velocity forward, and reverse it. The reasoning for a headrest in this case would be so that we don't do even more damage to our spine when our muscles and ligaments create that greater force after the moment of impact. Conversely, we are sitting in a car with little or no velocity and/or acceleration. We are rear-ended by another car with a greater force from velocity and acceleration, than ours. At the moment of impact, the car is projected forward, yet our bodies actually accelerate backward(negative acceleration with respect to the horizontal axis). The primary purpose of the headrest in this instance is to stop or minimize this negative acceleration, as well as limiting the recoil force of our neck and head moving forward with after the initial impact.
Newton’s Law of Motion
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Newton’s Law of Motion
Newton’s laws of motion are physic laws that form the base for Classical Mechanics. This paper discusses the purpose of headrests in car seats in accordance to the Newton’s Laws of motion. The headrest is a key safety feature to have in a vehicle. The article the first law of motion and it application on a moving vehicle. This is a good article because it advises the audience also check for headrests, in addition to airbags and safety belts, while evaluating the safety features of a vehicle.
Due to drastic reduction in speed, our bodies are jerked forward since they continue to move with the initial speed of the car. Our necks bear the strain as they hold the weight of the head moving forward at the speed of the car. The action of the safety belt causes a sudden change of direction causing whiplash. The headrests help to counter the effect and protect us from being injured.
According to the first law, our bodies are travelling in a uniform motion until the external force is exerted from the other car when it hits us from behind. Our head will continue to move with the car’s velocity (v0) and our body is pushed faster to a new velocity (v1).Our heads are jerked backwards and if there are no head rests the neck muscles would be strained while stopping the heads from the backwards motion. The headrest cushions the heads upon the impact of collision. From the third law ...