**Question**

**State Newton’s second law of motion and use it to define the unit of force in the CGS system. **

**Answer**

Newton’s second law of motion states that the acceleration of a body is directly proportional to the force acting on it and inversely proportional to its mass.

Mathematically, F = ma, where F is force, m is mass, and a is acceleration.

In the CGS system, the unit of force is defined as the dyne, which is the force required to impart an acceleration of 1 cm/s^{2} to a body of mass 1 gram.