How Do You Calculate Impact Duration and Average Force in Momentum Problems?

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Homework Help Overview

The problem involves calculating the duration of impact and the average force exerted during a momentum-related scenario where a moving arm strikes a wall and comes to rest. The subject area includes concepts of momentum, impulse, and force dynamics.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the relationship between momentum and force, with some referencing the impulse-momentum theorem. There are attempts to clarify the calculations involved, particularly regarding the momentum value and its implications.

Discussion Status

The discussion is ongoing, with participants offering hints and checking each other's calculations. There is an exploration of assumptions, such as constant acceleration during impact, and a focus on understanding the impulse integral.

Contextual Notes

There is a noted uncertainty regarding the accuracy of the momentum calculation, and participants are questioning the decimal placement in their values. The problem context suggests that specific values and assumptions may be critical to the calculations.

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A .450 kg arm moves horizontally at 7.00 m/s when it strikes a wall and comesto rest after driving the wall 1.00 cm. Calculate the duration of the impact. What was the average force exerted on the nail?

Delta P = F delta T
F delta t = m delta v
F=ma

I know the momentum would be .315 kgm/s, but I'm not sure how to calculate the rest.
 
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Hint: Assume that the acceleration is constant during the impact.
 
I know the momentum would be .315 kgm/s, but I'm not sure how to calculate the rest.

check that decimal point!
 
Naty1 said:
check that decimal point!
Yeah, that too! :smile:
 
What does the impulse integral say?
 

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