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Momentum Principle

  • Thread starter C R P
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  • #1
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View the attached picture that is the problem that I need help with.
 

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  • #2
SammyS
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View the attached picture that is problem I need help with.
Hello C R P. Welcome to PF !

Please read the rules for this Forum.

We cannot give help without you showing your work or your reasoning as to why you gave your answers. (Also, you should not give solutions to other people who don not show work.)

Please explain why you checked or didn't check each answer. Please indicate what is expected of you on this exercise.

attachment.php?attachmentid=54824&d=1358479795.png
 
  • #3
berkeman
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View the attached picture that is problem I need help with.
Check your PMs, and start showing your work (and explaining your proposed answers) here.
 
  • #4
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Bloody Hell, I've done 2 years of physics but I'm just doing something wrong with problem yet it's so basic.

Any ideas on what I'm doing wrong!?!?


*Is this good?
 
  • #5
SammyS
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Bloody Hell, I've done 2 years of physics but I'm just doing something wrong with problem yet it's so basic.

Any ideas on what I'm doing wrong!?!?

*Is this good?
Not too bloody good.


Which items are you sure of?

Which are you not very sure of, and why did you give those tentative answers.?
 
  • #6
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Ah it's too late now the home work was due at 11:59

I know Δp=FnetΔt and ΔP=mv

One question i do have is whether force parralel +force perpindicular are considered F net or not I feel like it should be F|| cross Fp
 
  • #7
SammyS
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Ah it's too late now the home work was due at 11:59

I know Δp=FnetΔt and ΔP=Δ(mv)

One question i do have is whether force parallel +force perpendicular are considered F net or not I feel like it should be F|| cross Fp
Written as vectors, as in the very first item: Yes, force parallel +force perpendicular = force, probably net force, depending on the context


What is the difference between the following two statements?
[itex]\displaystyle \vec{P}=\vec{F}_{\text{net}}\Delta t[/itex]

[itex]\displaystyle \vec{P}_\text{f}=\vec{P}_\text{i}+\vec{F}_{ \text{net}}\Delta t[/itex]​
?
 

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