# Forces help

1. Aug 26, 2009

### pointintime

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

a mass (m1) on a smooth horizontal surface, connected by a thin cord that passes over a pulley to a second block (m2), which hangs vertically.

If the acceleration is .098 m/s^2 and m1 is 1.0 kg how much must m1 must be to keep it at this acceleration

2. Relevant equations

net force = ma

3. The attempt at a solution

i got 99 kg
please help me... it's really late at night and I'm tired...

2. Aug 26, 2009

### ideasrule

Do what you always should do with mechanics problems: draw free-body diagrams, then write out Newton's second law for each body. Remember that the tension in a massless rope hung over a massless pulley is constant throughout the rope.

3. Aug 26, 2009

### darkmagic

Draw free-body diagrams of each object and the forces acting on them. If two objects are connected by a single string, then they have the same tension.

4. Aug 26, 2009

### pointintime

Do you know if I got it right?

5. Aug 26, 2009

### darkmagic

your asking for m1? It's already given. Am I right?