1a. Compared to the windshield when involved in an accident, theairbag: causes a

Question

1a. Compared to the windshield when involved in an accident, theairbag: causes a muchsmaller change in momentum
causes a muchsmaller change in kinetic energy
exerts a muchsmaller force
exerts a muchsmaller impulse
does much morework
I chose it exerts a much smaller force 1b. The law of conservation of momentum applies to a system ofcolliding objects only if: the net externalimpulse is zero
the coefficient ofrestitution is zero
there is no changein kinetic energy of the system
the coefficient ofrestitution is one
the collisions areall elastic I chose the net external impulse is zero 1c. For a completely inelastic two-body collision the kineticenergy retained by the objects is the same as: [M(vcom)2]/2, where M is the total mass andv_com is the velocity of the center of mass
the total kineticenergy before the collision
the kinetic energyof the more massive body before the collision
the kinetic energyof the less massive body before the collision
the difference inthe kinetic energies of the objects before the collision

Explanation / Answer

1a. Compared to the windshield when involved in an accident, theairbag: causes a muchsmaller change in momentum causes a muchsmaller change in kinetic energy exerts a muchsmaller force exerts a muchsmaller impulse does much morework I chose it exerts a muchsmaller force        CORRECT...this is why it hurts less to hit the air bag than to hit thewindshield 1b. The law of conservation of momentum applies to a system ofcolliding objects only if: the net externalimpulse is zero the coefficient ofrestitution is zero there is no changein kinetic energy of the system the coefficient ofrestitution is one the collisions areall elastic I chose the net externalimpulse is zero        CORRECT... because by definition, the net external impulseequals the change in momentum to the system 1c. For a completely inelastic two-body collision the kineticenergy retained by the objects is the same as: [M(vcom)2]/2,where M is the total mass and v_com is the velocity of the centerof mass     THIS IS THE definition of the finalkinetic energy the total kineticenergy before the collision the kinetic energyof the more massive body before the collision the kinetic energyof the less massive body before the collision the difference inthe kinetic energies of the objects before the collision

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