Final answer:
A physical quantity is a measurable characteristic of an object that includes aspects like length, mass, and time, with seven fundamental quantities. Physical laws are empirical principles that govern the behavior of these quantities. A vector physical quantity involves both magnitude and direction, such as displacement and force.
Step-by-step explanation:
Definition of Physical Quantities
A physical quantity is a characteristic or property of an object that can be measured or calculated from other measurements. Physical quantities include, but are not limited to, length, temperature, distance, time, mass, weight, force, and electric charge. They are essential for describing the physical world and are measured in units, which provide a standard for comparing different measurements. There are seven fundamental physical quantities: length, mass, time, electric current, temperature, amount of substance, and luminous intensity. All other physical quantities are derived units, created by combining the fundamental units mathematically.
Definition of Physical Laws
Physical laws are the principles that describe the behavior of physical quantities. They are based on empirical evidence and are formulated through observations and experiments. These laws allow us to make predictions about how physical systems will behave under certain conditions.
Vector Physical Quantity
A vector physical quantity is one that is fully described by both a magnitude and a direction. Examples of vector quantities include displacement, velocity, force, and electric and magnetic fields. In the language of mathematics, vectors are represented by mathematical objects known as vectors and have operations such as addition, subtraction, and multiplication, but division by a vector is not defined. Vectors are vital components in the study of physics and are used to describe numerous physical phenomena.