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PHYSICS XI �CHAPTER 4 �MOTION IN A PLANE

PREPARED BY

S KATARIA

PGT PHY

JNV NASIK

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Scalar Quantities

Scalar quantity is defined as the physical quantity with magnitude and no direction.

These quantities can be described just by their numerical value (with their respective units) without directions (they don’t have any direction). The addition of physical quantities follows the simple rules of the algebra. Here, only their magnitudes are added.

Examples of Scalar Quantities

Mass, Speed, Distance, Time, Area, Volume, Density, Temperature

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Vector quantities

A vector quantity is defined as the physical quantity that has both direction as well as magnitude.

Examples of Vector Quantities

Linear momentum, Acceleration, Displacement, Momentum, Angular, velocity, Force, gravitational field

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How to Represent a Vector

 

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MODULUS OF A VECTOR

 

NEGATIVE OF A VECTOR

The negative of a vector is define as another vector having the same magnitude but having an opposite direction

EQUAL VECTORS

Two vectors are equal if they have the same direction and same magnitude.

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COLLINEAR VECTORS

The vectors which either act along the same line or along parallel lines are called collinear vectors

COPLANAR VECTORS

The vectors which act in the same plane are called coplanar vectors.

A

B

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UNIT VECTOR

 

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ZERO VECTOR

 

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