The study of automobile safety is a very important field. 1. A safety device tha

Question

The study of automobile safety is a very important field.

1. A safety device that is showing up in many new car models is a collapsible steering column. When the driver collides with such a column:
None of these
The force on the driver is lessened because the momentum change of the driver is increased.
The force on the driver is lessened because of the decrease in time of the collision
The force of the driver is lessened because the momentum change of the driver is reduced
The force on the driver is lessened because of the increase in time of collision

2. For a given force, heavier cars are safer in collisions than lighter cars. This statement is:
True, by Newton’s Third Law
None of these
False, by Newton’s Third Law
True, by Newton’s Second Law
False, by Newton’s Second Law

3. In a head-on collision between two identical cars, which of the following is true when comparing elastic and inelastic collisions:
An elastic collision is less damaging to the cars than an inelastic collision
Either type of collision is equally damaging
None of these
An inelastic collision is less damaging to the cars than an elastic collision
The more damaging collision involved smaller impulses

4. Two cars collide inelastically at a North-South East West intersection. The skid marks point northwest. Concerning the initial directions of the two cars, this tells you that one driver was traveling:
East while the other was traveling north
West while the other was traveling south
None of these
East while the other was traveling south
West while the other was traveling north

5. Consider a one-dimensional collision between a moving car (Car 1) and a initially stationary car (Car 2). What statement can you make about the mass of Car 2 relative to the mass of Car 1, if Car 2 is to recoil with the greatest speed?
The relative masses of the cars are irrelevant
The two masses should be equal
The masses of Car 2 should be much greater than the mass of Car 1
None of these
The mass of Car 2 should be much less than the mass of Car 1

6. A large truck, travelling due south with speed v collides with a small car traveling due north with the same speed v. After the collision, the car is moving due east, with the same speed it had prior to the collision. What can you say about the final velocity of the truck?
None of these
It points southeast
It points southwest
It points west
It points south

7. In any collision, the objects eventually slow down and stop. What does this mean in terms of momentum conservation?
We have to consider whether friction will cause a collision to be elastic or inelastic
Momentum is conserved in the presence of friction, if we extend what we mean by internal forces
None of these
Momentum conservation works only for certain collisions.
Momentum is conserved only in the absence of friction

Explanation / Answer

1) The force on the driver is lessened because of the increase in time of collision

2) True, by Newton’s Second Law

3) An elastic collision is less damaging to the cars than an inelastic collision.

4) West while the other was traveling north

5) The masses of Car 2 should be much greater than the mass of Car 1

6) Not sure.

7) none of these

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