**Question**

**State Newton’s second law of motion. Define dyne and newton. Establish a relationship between them.**

**Answer**

Newton’s second law of motion states that the force acting on an object is directly proportional to its mass and acceleration, and is given by the equation F = ma.

Dyne is a unit of force used in the CGS system of units. It is defined as the force required to impart an acceleration of 1 centimetre per second squared to a mass of 1 gram, and is denoted by the symbol “dyn”.

Newton is the SI unit of force, defined as the force required to impart an acceleration of 1 meter per second squared to a mass of 1 kilogram, and is denoted by the symbol “N”.

1 Newton (N) = 1 kg m / s^{2}

= 1000 × 100 g cm / s^{2}

= 100000 dyne

= 10^{5} dyne

∴ 1 Newton (N) = 10^{5} dyne