1. Which one of the following statements best explains why an air bag reduces th
ID: 1623992 • Letter: 1
Question
1. Which one of the following statements best explains why an air bag reduces the likelihood of injury?
a) The air bag reduces the time interval over which the change of momentum occurs during a collision.
b) The air bag reduces the average force that occurs during the collision.
c) The air bag reduces the change of momentum that occurs during a collision.
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2. Two objects of different masses collide. Which one of the following statements is FALSE?
a) During the collision, the force on object 2 exerted by object 1 is equal and opposite to the force on object 1 exerted by object 2.
b) During the collision, the acceleration of object 2 is equal and opposite to the acceleration of object 1.
c) The change of momentum of object 1 is equal and opposite to the change of momentum of object 2.
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3. Consider a collision between two objects. If the net external force acting on the objects is zero, then...
a) the total momentum of the two objects is not conserved but the total kinetic energy of the two objects is conserved.
b) the total momentum of the two objects is conserved but the total kinetic energy of the two objects is not necessarily conserved.
c) the total momentum of the two objects and the total kinetic energy of the two objects are conserved.
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4. Two objects of equal mass undergo a perfectly inelastic collision. Before the collision, one object is moving north and the other is moving east. You may assume that there are no external forces acting on the objects during the collision. Which one of the following choices is the only possible outcome of the collision?
a) Both objects move directly north after the collision.
b) Both objects move in a direction at some angle north of east.
c) Both objects move directly east after the collision.
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5. Which one of the following statements concerning momentum is true?
a) Two objects of the same mass and moving with the same speed in opposite directions have the same momentum.
b) An object of mass 2m, moving eastward with a speed of , has the same momentum as an object of mass m moving eastward with a speed of 2.
c) An object of mass 2m, moving eastward with a speed of 2, has the same momentum as an object of mass m moving eastward with a speed of .
Explanation / Answer
1. option b is correct using impulse momentum, time of collision is increased so average force is reduced
2 option b is false as acceration of heavier mass would be less
3. option b is correct as momentum is always conserved but kinetic energy depend upon if collision is elastic or not
4. option b is correct
5. option b is correct
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