) A 100-g ball falls from a window that is 12 m above ground level and experiences no significant air resistance as it falls. Wh
1 answer:
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Refer to the diagram shown below.
Let m = the mass (g) of the door.
Let v = the launch velocity
Let u = the velocity of the door after impact.
Elastic impact (rubber ball):
The rubber ball bounces off the door with presumably elastic impact, which means that both momentum and kinetic energy are conserved.
Conservation of momentum requires that
400v = -400v + mu
Therefore
Inelastic impact (clay):
The clay sticks to the door after impact.
Conservation of momentum requires that
400g = (m+400)u
Therefore
When we compare magnitudes of u for the door, we find that
Clearly, the elastic impact creates a greater value of u for the door.
Answer:
The rubber ball creates a larger impulse to the door because the nature of its impact is approximately elastic.
Let m = the mass (g) of the door.
Let v = the launch velocity
Let u = the velocity of the door after impact.
Elastic impact (rubber ball):
The rubber ball bounces off the door with presumably elastic impact, which means that both momentum and kinetic energy are conserved.
Conservation of momentum requires that
400v = -400v + mu
Therefore
Inelastic impact (clay):
The clay sticks to the door after impact.
Conservation of momentum requires that
400g = (m+400)u
Therefore
When we compare magnitudes of u for the door, we find that
Clearly, the elastic impact creates a greater value of u for the door.
Answer:
The rubber ball creates a larger impulse to the door because the nature of its impact is approximately elastic.