Question

As part of a safety investigation, two 1600 kg cars traveling at 21 m/s are crashed into different barriers.

A) Find the average force exerted on the car that hits a line of water barrels and takes 1.8 s to stop.
B) Find the average force exerted on the car that hits a concrete barrier and takes 0.14 s to stop.

Answer 1

Answer

given,

mass of the car = 1600 Kg

velocity of the car = 21 m/s

time = 1.8 s

a) momentum = mass x velocity

P = 1600 x 21

P = 33600 kg.m/s

$Force = \dfrac{change\ in \ momentum}{t}$

$Force = \dfrac{33600-0}{1.8}$

F = 18666.67 N

b) $Force = \dfrac{change\ in \ momentum}{t}$

$Force = \dfrac{33600-0}{0.14}$

F = 240000 N