# Massless Model in Gazebo

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.

<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>