Massless Model in Gazebo

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Hi,

I have a model in Gazebo. Upon applying little bit of force it overreacts, so it seems the model is almost massless. I tried assigning mass by using the "inertial mass" tag in the model sdf file, but it doesn't seem to do much.

Here is my link tag:

<link name='chassis'>
        <pose>0 0 1 0 0 0</pose>

        <inertial>
            <mass value="10" />
        </inertial>

        <collision name='collision'>
          <geometry>
        <box>
          <size>2.8 2.5 1.5</size>
        </box>
          </geometry>
        </collision>

        <visual name='visual'>
          <geometry>
        <box>
          <size>2.8 2.5 1.5</size>
        </box>
          </geometry>
        </visual>

</link>

I am starting with gazebo, so I appreciate any help.