(adsbygoogle = window.adsbygoogle || []).push({}); Pulley Tension friction help??

1. The problem statement, all variables and given/known data

http://www.flickr.com/photos/72384417@N06/6533043261/ [Broken] by LiFK1, on Flickr

Mass1 = 0.750 kg

Mass2 = 0.52 kg

Fk=2.1 N

g= 9.8 N

2. Relevant equations

F=ma

Mass1(gravity)= (Mass1+mass2)Acceleration

T + m2g - fk = (m1 + m2)a

3. The attempt at a solution

Mass1(gravity)= (Mass1+mass2)Acceleration

7.35=(0.750kg+0.52kg)A

5.787 N = A

T + m2g - fk = (m1 + m2)a

T + 0.52kg(9.8)-2.1=1.27(5.78)

T = 4.35 N

rounded up T = 4.4N

Apparently the answer to this is 4.2 N, but i cant seem to get it.

Can someone tell me what im doing wrong?

thanks in advance.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Pulley Tension friction help?

**Physics Forums | Science Articles, Homework Help, Discussion**