Measuring Projectile Velocity Using Block Deviation

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SUMMARY

The discussion focuses on measuring the velocity of a projectile by analyzing the deviation of a block suspended on two ropes after being struck. Key factors include the conservation of momentum during the collision phase and the conservation of mechanical energy during the subsequent swing phase. The masses of both the projectile and the block, as well as the length of the ropes, are critical parameters for accurate calculations. Gravity's role in the deviation and potential sticking of the projectile to the block is also acknowledged as significant.

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  • Understanding of conservation of momentum principles
  • Knowledge of mechanical energy conservation
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  • Basic physics concepts related to forces and gravity
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Physics students, educators, and anyone interested in experimental mechanics or projectile motion analysis will benefit from this discussion.

Gavroy
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First of all: Sorry about my English, but I am from France ;-)
The problem:
Somebody shoots into a block which is put up on two free running ropes and now you want to determine the velocity of the projectile by measuring the deviation of the block. I also have to consider gravity, which may protect the block from being deviated and the projectile gets stuck to the block, if this is important.
I want to add that the mass of the projectile, the mass of the block and the length of the ropes are known.
I am sorry that I can’t offer you an initial stage for a solution. The only thing I know is that the conservation of momentum may be a possible approach
 
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Welcome to PF!

Hi Gavroy! Welcome to PF! :smile:

In questions like this, divide the motion into two stages, the collision and the swing …

i] in the collision, momentum is conserved, so find the final velocity for the collision, wchi becomes the initial velocity for the swing

ii] in the swing, (mechanical) energy is conserved :wink:
 

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