Car seat belts play a vital role in minimizing injuly during collision .show using second law of motion how the impact force is reduced?
According to Newton's second law of motion, the force acting on an object is equal to the mass of the object multiplied by its acceleration (F = m*a).
In the case of a car collision, when the car suddenly decelerates or stops, the passengers in the car continue to move forward due to their inertia (tendency to stay in motion). If there were no seat belts, the passengers would continue to move forward at the same speed until they hit an object (such as the dashboard or windshield) or fly out of the car.
However, when seat belts are worn and properly fastened, they apply an opposing force to the passengers' forward motion. As a result, the passengers’ acceleration is reduced, and so is the force acting on them. This reduces the impact force during a collision.
By applying Newton's second law, we can see that if the acceleration of the passengers is reduced, the force acting on them is also reduced. Therefore, by wearing seat belts, the impact force experienced by the passengers during a collision is minimized, reducing the risk of injury.
Car seat belts play a vital role in minimizing injuly during collision .show using second law of motion how the impact force is reduced?( To better respond to this question.derive the newton second law of motion as rate of change of momentum)
Newton's second law of motion states that the rate of change of momentum of an object is directly proportional to the net force applied, and occurs in the direction of the force. Mathematically, it can be expressed as:
F = Δp/Δt
Where:
F = Net force applied to the object
Δp = Change in momentum of the object
Δt = Change in time
Now let's consider a scenario where a car is involved in a collision and the passenger is wearing a seat belt. Prior to the collision, both the car and the passenger are moving at a certain velocity. During the collision, the car rapidly decelerates due to an external force (such as hitting another car or a barrier).
As a result of the collision, the passenger also experiences a change in velocity, from the original velocity to a slower velocity. This change in velocity is the change in momentum (Δp) experienced by the passenger.
By wearing a seat belt, the passenger's body is kept in contact with the seat. This results in the seat belt applying a force in the opposite direction of the passenger's motion, reducing the rate of change of momentum and ultimately reducing the impact force.
The seat belt increases the time period (Δt) over which the change in momentum occurs. As a result, the rate of change of momentum (Δp/Δt) decreases, causing the impact force (F) to be reduced.
Therefore, by applying Newton's second law of motion, we can see that when the seat belt increases the time period over which the change in momentum occurs, the impact force experienced by the passenger during a collision is reduced, reducing the risk of injury.
According to Newton's second law of motion, the force (F) acting on an object is equal to the mass (m) of the object multiplied by its acceleration (a). In the case of a collision, the force experienced by a person inside a car is determined by their mass and the change in velocity.
During a collision, if a person inside the car is not wearing a seat belt, they will continue moving at a constant velocity until an external force acts on them. This means that when the car suddenly decelerates or comes to a stop, the person inside the car will continue moving at the car's original velocity until they are stopped by hitting the interior of the car or another object.
However, when a person wears a seat belt, it serves to increase the time over which the person comes to a stop. This leads to a smaller acceleration and, therefore, a smaller force acting on the person according to Newton's second law.
The seat belt achieves this reduction in force by stretching or elongating slightly during the collision. By stretching, the seat belt increases the time it takes for the person to come to a stop, which reduces the acceleration and ultimately the force applied to their body.
In summary, the seat belt extends the time of deceleration, reducing the acceleration and force experienced by a person during a collision, thus minimizing injuries.