Summary
Units are the foundation for comparing physical quantities and establishing standards. Fundamental units like length, mass, and time are independent and crucial for measurement. Derived units, such as velocity and force, are created by combining fundamental units. Common unit systems include CGS, FPS, MKS, and the widely-used SI system. Understanding motion involves concepts like distance, speed, velocity, acceleration, and equations of motion for objects in motion.
Introduction to Units
Units are used to compare physical quantities and provide a standard reference. They are represented as a product of a number and a unit, such as meters or seconds.
Fundamental Units
Fundamental units are the basic units of measurement for quantities like length, mass, time, temperature, current, and amount of substance. They are independent and cannot be represented solely in terms of other quantities.
Derived Units
Derived units are obtained by combining fundamental units. Examples include area, volume, density, velocity, acceleration, force, work, and energy.
Systems of Units
Common systems of units include CGS, FPS, MKS, and SI. Each system has its specific units for length, mass, and time. SI system is widely used in scientific measurements.
Motion Basics
Motion involves concepts like distance, displacement, speed, velocity, acceleration, and equations of motion. Objects are in motion if their position changes with time.
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