# Incline Plane Problem

1. Sep 11, 2011

### maff is tuff

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

A block of mass m1 = 4.50 kg on a frictionless inclined plane of angle 30.0° is connected by a cord over a massless, frictionless pulley to a second block of mass m2 = 2.80 kg hanging vertically.

What is the magnitude of the acceleration of each block?

2. Relevant equations

3. The attempt at a solution

I have attached two of my many attempts. I think the second attempt is closer because I realized that since the blocks are connected that they have the same magnitude of acceleration but just different directions. Both of these answers are wrong along with the many others I have submitted. Some help and/or hints would be great. Thanks.
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

#### Attached Files:

• ###### physics number 6.pdf
File size:
1.8 MB
Views:
80
2. Sep 11, 2011

### Spinnor

The force acting on the mass m1 via mass m2 is the tension T in the rope and it is only equal to m_1*g when nothing moves. The mass m_1 is accelerating so T - m_1*g = m_1*a, T is not equal to m_1.

I think it helps to draw a separate free body diagram for each mass.

#### Attached Files:

• ###### mass on plane027.jpg
File size:
18.2 KB
Views:
63
3. Sep 11, 2011

### maff is tuff

Ok thanks that makes sense. I'll try the problem again tomorrow.