Two blocks and a pulley, friction

  • Thread starter nbaumann
  • Start date
  • #1
nbaumann
2
0

Homework Statement



Two masses are connected by a string which passes over a frictionless, massless pulley. One mass hangs vertically and one slides on a horizontal surface. The horizontal surface has a coefficient of kinetic friction 0.2. The vertically hanging mass is 4.0 kg and the mass on the horizontal surface is 6.0 kg. Find the acceleration of the mass.

Homework Equations



T=mBg-mBa

The Attempt at a Solution



I've basically done this problem without factoring friction, and this my problem, I don't know how to factor friction.

a = (mBg)/(mA + mB) is what I used.


Thanks!
 

Answers and Replies

  • #2
Hootenanny
Staff Emeritus
Science Advisor
Gold Member
9,624
8

Homework Statement



Two masses are connected by a string which passes over a frictionless, massless pulley. One mass hangs vertically and one slides on a horizontal surface. The horizontal surface has a coefficient of kinetic friction 0.2. The vertically hanging mass is 4.0 kg and the mass on the horizontal surface is 6.0 kg. Find the acceleration of the mass.

Homework Equations



T=mBg-mBa

The Attempt at a Solution



I've basically done this problem without factoring friction, and this my problem, I don't know how to factor friction.

a = (mBg)/(mA + mB) is what I used.


Thanks!
Welcome to Physics Forums,

You should look again at the tension in the string, is that the only condition that the tension needs to satisfy? What about the other block?
 
  • #3
nbaumann
2
0
Thanks for your reply.

This was really as far as I got. Wouldn't the tension just apply once? As there is only one string?
 

Suggested for: Two blocks and a pulley, friction

  • Last Post
Replies
13
Views
660
Replies
44
Views
1K
Replies
4
Views
485
Replies
10
Views
450
  • Last Post
Replies
2
Views
359
Replies
102
Views
2K
Replies
22
Views
478
Replies
4
Views
766
  • Last Post
Replies
6
Views
546
Top