# F06s(2) - Physics 204A THIRD EXAM Chapters 1 11 Fall 2006...

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Physics 204A THIRD EXAM Chapters 1 - 11 Fall 2006 1 Name:_________________________________________ Solve the following problems in the space provided. Use the back of the page if needed. Each problem is worth 20 points. You must show your work in a logical fashion starting with the correctly applied physical principles. The equations you need are on the equation sheet. Your score will be maximized if your work is easy to follow because partial credit will be awarded. 1. I saw the sketch below in the newspaper last summer. The author explained the benefits of using cable barriers instead of concrete on highways in simple terms. Now, you need to explain the same thing using the principles of physics. The physics principle involved is the Impulse-Momentum Theorem. " p = Fdt # The change in momentum of a car colliding with the barrier is the same whether the barrier is made of concrete or cables because whatever the original momentum, it will presumably be reduced to zero. The difference between the barriers is on the right side of the equation. If the barrier is made of concrete, the time to bring the car to rest is very short compared to the time for a cable barrier. Therefore, the force exerted by the concrete barrier must be much larger than the force exerted by the cables. If the force on the car is smaller, damage to the vehicle and its passengers will be reduced.

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F06s(2) - Physics 204A THIRD EXAM Chapters 1 11 Fall 2006...

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