Give conditions for mechanical equilibrium.

Explanation

To determine the conditions for mechanical equilibrium, we need to consider both translational and rotational aspects of motion. Here's a step-by-step solution:

### Step 1: Understand Mechanical Equilibrium
Mechanical equilibrium occurs when a system is in a state where there are no net forces or net torques acting on it. This means the system is at rest or moving with a constant velocity.

### Step 2: Condition for Translational Equilibrium
For translational equilibrium, the sum of all forces acting on the object must be zero. Mathematically, this can be expressed as:
\[
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