## Linear Momentum of a System of Particles | Definition – Rotational Motion

We are giving a detailed and clear sheet on all Physics Notes that are very useful to understand the Basic Physics Concepts.

**Linear Momentum of a System of Particles:
**For a system of n particles, the total momentum of a system of particles is equal to the product of the total mass and velocity of its centre of mass.

p = Mv_{CM}

According to Newton’s second law for system of particles

Net external force,

F_{ext} = \(\frac{d p}{d t}\)

where F is the force of the particle. For ‘ n ‘ no. of particles total linear momentum is,

P = p_{1} + p_{2} +…..+p_{n}

**Rotational Motion:
**In this portion, we will learn about the rotational motion of the objects. A body moves completely in rotational motion when each particle of the body moves in a circle about a single line. When a force is applied on a body about an axis it causes a rotational motion. The force applied here is called the torque. The axis of the rotation usually goes through the body. Also, learn the two theorems such as parallel axes and perpendicular theorem explained with respect to rotational motion of objects.