For those who have this textbook.

  • #1

Homework Statement



In Physics for Scientists and Engineers Volume 1 Eighth Edition (Serway, Jewett)

Number 55. in Chapter 5, I checked the answer key and would like to know why they don't consider the forces of friction in a), b), c), d), and e)? This confuses me. Thank you.

Homework Equations



F = ma

The Attempt at a Solution



The solutions for f and g I got right.
 

Answers and Replies

  • #2
1,045
2
I don't have the book, what is the actual question?

Many times friction is ignored in order to explain concepts with simplicity.
 
  • #3
Last edited by a moderator:
  • #4
Doc Al
Mentor
45,180
1,502
Number 55. in Chapter 5, I checked the answer key and would like to know why they don't consider the forces of friction in a), b), c), d), and e)? This confuses me.
Seems just wrong to me.

Does the book really say: "The coefficient of kinetic friction between the block of mass m1 and the table is m1, and that between the block of mass m2 and the table is m2." That makes no sense! (Maybe μ1 and μ2?)
 
  • #5
Doc Al
Mentor
45,180
1,502
I want to add that obviously in the book the coefficients are labeled "mu"1 and 2
That's better.
 
  • #6
Seems just wrong to me.

Does the book really say: "The coefficient of kinetic friction between the block of mass m1 and the table is m1, and that between the block of mass m2 and the table is m2." That makes no sense! (Maybe μ1 and μ2?)

Yeah it's actually labeled μ in the book
 

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