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Calculate the average net force acting on the bullet

  • Thread starter silje
  • Start date
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I have a physics problem and are woundering if someone can please help me!o:)
Here's the problem: A bullet of mass 20 g strikes a fixed block of wood at a speed of 320 m/s. The bullet embeds itself in the block of wood, penetrating to a depth of 6.0 cm. Calculate the average net force acting on the bullet while it is being brought to rest. (1.7 x 14^4 N)

would have been nice with the whole calculation.
Thanks! :!!)
 

PhanthomJay

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silje said:
I have a physics problem and are woundering if someone can please help me!o:)
Here's the problem: A bullet of mass 20 g strikes a fixed block of wood at a speed of 320 m/s. The bullet embeds itself in the block of wood, penetrating to a depth of 6.0 cm. Calculate the average net force acting on the bullet while it is being brought to rest. (1.7 x 14^4 N)

would have been nice with the whole calculation.
Thanks! :!!)
Trythe work-energy theorem, which states
[tex] W_{net} = \Delta KE[/tex]
What is the initial kinetic energy of the bullet just before it penetrates the wood? What is its final kinetic energy when it comes to a stop in the wood? What is the difference between the two energies? What is the definition of work?
 
5
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Alternatively, you can use kinematics to determine the acceleration of the bullet (vf^2 = vi^2 + 2ad), then use Newton's 2nd Law to determine the force (F = ma).
 
2
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thank you very much! =)
 

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