Axial Vectors: Vectors which represent the rotational effect and acts along the axis of rotation are called Axial vectors. Eg: Angular velocity, torque, angular momentum, ect., Null vector: A vector with zero magnitude and having an arbitrary direction is called a null vector. Collinear Vectors: The two or more vectors are said to be collinear, when they act along the same lines or parallel lines. Coplanar Vectors: The two or more vectors are said to be coplanar if the vectors lying in the same plane.
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COLLISION: Redistribution of momentum of particles happend is said to be collision. ELASTIC COLLISION: In a collision, linear momentum and kinetic energy both are conserved then such collision is said to be elastic collision. Eg: Collision between fundamental particles. Inelastic Collision: In a collision, linear momentum conserved but kinetic energy is not conserved then such collision is said to be elastic collision. Eg: Collision between heavy massive particles. Coefficient of restitution: It is defined as the ration between relative velocity of separation after collision to the relative velocity of collision before collision. ( v 2 - v 1 ) e = -------------------- (u 1 - u 2 ) Line of Impact: At the time of collision between two bodies there is a contact during collision. If a line drawn perpendicular to