Finding the force during impact

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Homework Help Overview

The discussion revolves around calculating the maximum force acting on a plastic electronic product during an impact after being dropped from a height of 1.3 meters. The product has a mass of 2 kg and bounces back 0.1 meters after hitting the ground, with a specified contact time of 0.1 seconds. The context includes concepts from mechanics, particularly relating to forces, energy, and motion.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the adequacy of the provided information for calculating the maximum contact force and question the necessity of knowing the contact time. Some suggest using the impulse-momentum principle and the work-energy theorem to analyze the situation further.

Discussion Status

The discussion is ongoing, with participants exploring various interpretations of the problem and the implications of the assumptions made. Some guidance has been offered regarding the use of energy conservation and momentum change, but no consensus has been reached on the method to calculate the force.

Contextual Notes

There is a noted concern about the assumption of contact time and its impact on the calculations. Participants emphasize the need for clarity on the conditions of the problem, particularly regarding the elastic properties of the ground and the object.

koii123
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Homework Statement


An inspector performed a drop test:
He released a plastic electronic product (2kg) at the height 1.3m from the ground. The plastic product than hit the ground, and bounced 0.1m after impact. Time of contact =0.1s

Find the maximum force acting on the object during impact. Assume the ground is perfectly elastic.

Homework Equations


Potential energy = mgh
Work done = Fd

Then, Force acting on the object = F = mgh/d

The Attempt at a Solution


F=2(9.8)1.3/0.1
Answer is 254.8N

Is this correct?? :confused:
Please help! :frown:
 
Last edited:
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It doesn't seem like there's nearly enough information given to calculate the maximum contact force during impact. In fact, even if you wanted to determine the average force during impact, you would still need to know the contact time.

Chet
 
Chestermiller said:
It doesn't seem like there's nearly enough information given to calculate the maximum contact force during impact. In fact, even if you wanted to determine the average force during impact, you would still need to know the contact time.

Chet

actually, suppose there is enough information, how to calculate?
and how to use the contact time?
can you please teach me?
 
koii123 said:
actually, suppose there is enough information, how to calculate?
and how to use the contact time?
can you please teach me?

we can't assume the time of contact to be something. It should be noted in the problem.
 
nil1996 said:
we can't assume the time of contact to be something. It should be noted in the problem.

i have updated the time of contact: 0.1s,
so how to calculate it?
 
wait if you want the impulse then you can just find the change in momentum without the need of the time period.
 
remember that it is said that ground is perfectly elastic but not the plastic box.
Using work energy theorem you can find the velocities before and after collision.
 
Last edited:
koii123... First calculate the velocity of the object just before it touches the ground ? You can use either energy conservation or kinematics equation .
 
Last edited:

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