# Dyne - Sec is the Cgs unit of _____________

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Dyne - Sec is the Cgs unit of _____________
1. Momentum
2. Energy
3. Pressure
4. Power

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Correct Answer - Option 1 : Momentum

Concept:

Dyne and Cgs unit

Dyne is the Cgs unit of Force.

Cgs is the way of expressing the units in C - Centimeter, g - gram, s - second.

Second Law of Motion:

The rate of change of momentum is directly proportional to the applied force.

$F = \frac{Δ P}{t}$

⇒ Δ P = F.t

Momentum is the product of mass and velocity.

Explanation:

So, we have

Δ P = F.t

Or

Momentum = Force × time

So, the unit of momentum is the unit of force multiplied by the unit of time.

Cgs unit of momentum = Cgs unit of force × cgs unit of time = dyne × second

So, dyne × second is the cgs unit of momentum.

• SI unit of momentum or impulse is Newton - meter or Kg m /s.
• erg is the Cgs unit of energy.