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Calculate the mass when not hanging it in dynamometer

  • #1
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Homework Statement


Hello! I have a physics problem that I can't solve. I'm supposed to describe how I can calculate the mass when knowing the µv (I don't know the english term but i'm guessing friction...something (friction when the object is not moving)). You are allowed to use a dynamometer but you are not allowed to hang the object (that I want to know the mass of) in it. I have nooo idea how to solve it haha.

Homework Equations


..

The Attempt at a Solution


I thought that maybe i could drag the object with the dynamometer and then know the N, but i dunno??? haha please help.
 

Answers and Replies

  • #2
berkeman
Mentor
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Welcome to the PF. :smile:
µv (I don't know the english term but i'm guessing friction...something (friction when the object is not moving)).
The term is probably "static friction" or µs. That is used when two surfaces are moving together and not sliding past each other.

You are allowed to use a dynamometer but you are not allowed to hang the object (that I want to know the mass of)
Can you post a picture or diagram of what you call a "dynamometer"? I'm familiar with the term, but only in the context of measuring motor power and torque, not in the context of measuring the coefficient of friction or a mass. Thank you.

EDIT/ADD -- You can attach a PDF or JPEG file to your reply by using the "Upload" button in the lower right corner of the Reply/Edit window. :smile:
 
  • #3
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Welcome to the PF. :smile:

The term is probably "static friction" or µs. That is used when two surfaces are moving together and not sliding past each other.


Can you post a picture or diagram of what you call a "dynamometer"? I'm familiar with the term, but only in the context of measuring motor power and torque, not in the context of measuring the coefficient of friction or a mass. Thank you.

EDIT/ADD -- You can attach a PDF or JPEG file to your reply by using the "Upload" button in the lower right corner of the Reply/Edit window. :smile:

Thank you for responding!

https://www.google.se/search?q=dyna...B&biw=360&bih=512#imgrc=d3cklw9wGJhFCM:&isa=y

This is a dynamometer. If you hang an object in the hook of it you can measure the force (in newton) and then calculate the mass.
 
  • #4
CWatters
Science Advisor
Homework Helper
Gold Member
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The Attempt at a Solution


I thought that maybe i could drag the object with the dynamometer and then know the N, but i dunno??? haha please help.
That sounds correct to me. You just need to describe the method in more detail.
 

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