# Homework Help: Help me understand please (short one!)

1. Apr 16, 2012

### mazz1801

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

This is in a written example of some lecture notes that I have.
Is in the middle of a question about the forces of contact between two blocks on a smooth table.
I don't need help with the rest of the question.

I just want to know how to get from equation 1 below to equation 2.
Is it some math shortcut that I am unaware of or am I missing out on some calculations

2. Relevant equations

F(1-(m1/m1+m2))

Goes to

(m2/m1+m2)F

2. Apr 16, 2012

### MrWarlock616

Don't worry, it's simple math calculation:

$F(1-\frac{m_1}{m_1+m_2})=F(\frac{m_1+m_2-m_1}{m_1+m_2})=F(\frac{0+m_2}{m_1+m_2})$

which then becomes:

$F(\frac{m_2}{m_1+m_2})$ or can be written as $(\frac{m_2}{m_+m_2})F$

3. Apr 16, 2012

### mazz1801

Thank you so much! :)