State Newton’s second law of motion. How does it help to measure force? Also state the units of force.

Explanation

### Step-by-Step Solution

**Step 1: State Newton's Second Law of Motion**
Newton's second law of motion states that the net external force acting on a body is equal to the product of its mass and acceleration. This can be expressed mathematically as:
\[ F_{\text{net}} = m \cdot a \]
where:
- \( F_{\text{net}} \) is the net external force,
- \( m \) is the mass of the body,
...