Posted by micole on Thursday, May 17, 2007 at 12:10pm.
Seatbelts provide two main advantages in a car accident: (i) they keep you from being thrown from the car, and (ii) they reduce the force that acts on you during the collision to survivable levels. The second benefit can be illustrated by comparing the net force exerted on the driver of a car in a head-on collision with and without a seatbelt.
(a) A driver wearing a seatbelt decelerates at the same rate as the car itself. Since modern cars have a "crumple zone" built into the front of the car, the car will decelerate over a distance of roughly 1.0 m. Find the net force acting on a 62 kg driver who is decelerated from 19 m/s to rest in a distance of 1.0 m.
? kN
(b) A driver who does not wear a seatbelt continues to move forward with a speed of 19 m/s (due to inertia) until something solid is encountered. The driver now comes to rest in a much shorter distance -- perhaps only a centimeter. Find the net force acting on a 62 kg driver who is decelerated from 19 m/s to rest in 1.0 cm.
? kN
I am not sure how to set this problem up. Can someone describe the picture or suggest which equations to use?
a)
avg force *distance= 1/2 mass*initialvelocity^2
b) same formula, distance has changed.
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