Physics
Physi Video Notes
cs Video Notes
Motion in a
plane
Class 11ᵗʰ
, Physical Quantities
Didn’t understand? Watch
A physical quantity is a quantity that can be measured the video (Click Here)
and expressed in terms of a numerical value along with its appropriate unit.
Physical Quantities are broadly classified into:
Scalar Quantities Vector Quantities
Scalar Quantities: Quantities that have only magnitude and no direction.
Examples: Mass (kg), Time (s), Distance (m), Speed (m/s), Energy (J) etc.
Characteristics:
Fully described by a numerical value (magnitude) and unit.
Direction is not relevant.
Follows the rules of algebra for addition, subtraction, multiplication, etc.
Vector Quantities: Quantities that have both magnitude and direction.
Examples: Displacement (m), Velocity (m/s), Acceleration (m/s²), Force (N),
Momentum (kg·m/s) etc.
Characteristics:
Represented by an arrow: the length of the arrow denotes magnitude, and the
arrowhead indicates direction.
Follows vector algebra for operations like addition (triangle or parallelogram
law) and subtraction.
Can be resolved into components.
Didn’t understand? Watch
Representation of vector the video (Click Here)
A vector is represented to depict magnitude and direction of physical quantity in
both:
Graphical form
Mathematical form
Graphical Representation
Arrow Representation:
A vector is shown as an arrow.
Physi Video Notes
cs Video Notes
Motion in a
plane
Class 11ᵗʰ
, Physical Quantities
Didn’t understand? Watch
A physical quantity is a quantity that can be measured the video (Click Here)
and expressed in terms of a numerical value along with its appropriate unit.
Physical Quantities are broadly classified into:
Scalar Quantities Vector Quantities
Scalar Quantities: Quantities that have only magnitude and no direction.
Examples: Mass (kg), Time (s), Distance (m), Speed (m/s), Energy (J) etc.
Characteristics:
Fully described by a numerical value (magnitude) and unit.
Direction is not relevant.
Follows the rules of algebra for addition, subtraction, multiplication, etc.
Vector Quantities: Quantities that have both magnitude and direction.
Examples: Displacement (m), Velocity (m/s), Acceleration (m/s²), Force (N),
Momentum (kg·m/s) etc.
Characteristics:
Represented by an arrow: the length of the arrow denotes magnitude, and the
arrowhead indicates direction.
Follows vector algebra for operations like addition (triangle or parallelogram
law) and subtraction.
Can be resolved into components.
Didn’t understand? Watch
Representation of vector the video (Click Here)
A vector is represented to depict magnitude and direction of physical quantity in
both:
Graphical form
Mathematical form
Graphical Representation
Arrow Representation:
A vector is shown as an arrow.
