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 61 kg driver who is
decelerated from 16 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 16 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 61 kg driver who is decelerated from 16 m/s to rest in 1.0
cm.
our response differs significantly from the correct answer. Rework
your solution from the beginning and check each step carefully.
__________kN
Seatbelts provide two main advantages in a car accident: (i) they keep you from being thrown...
A car is towing a boat on a trailer. The driver starts from rest and accelerates to a velocity of +17.2 m/s in a time of 26.3 s. The combined mass of the boat and trailer is 479 kg. The frictional force acting on the trailer can be ignored. What is the tension in the hitch that connects the trailer to the car?
A car is towing a boat on a trailer. The driver starts from rest and accelerates to a velocity of +16.8 m/s in a time of 29.5 s. The combined mass of the boat and trailer is 413 kg. The frictional force acting on the trailer can be ignored. What is the tension in the hitch that connects the trailer to the car?
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