Chapter 1: Physical Quantities, Units and Measurements (physics)

These flashcards cover key concepts from Chapter 1 on Physical Quantities, Units, and Measurements in Physics.

What are Physical Quantities?

A physical quantity is a measurable quantity consisting of a numerical magnitude and a unit.

What are the base quantities and their SI units?

Mass (kg), length (m), time (s), current (A), temperature (K), amount of substance (mol).

What is the importance of standardized measurements?

Standardized measurements ensure consistency and accuracy when measuring physical quantities.

What are prefixes used for in SI units?

Prefixes are used to indicate decimal sub-multiples and multiples of the SI units, such as nano (n), micro (μ), milli (m), centi (c), deci (d), kilo (k), mega (M), giga (G), tera (T).

What is the SI unit for length?

The SI unit for length is the meter (m).

What is a digital micrometer screw gauge used for?

A digital micrometer screw gauge is used to measure objects that are too small to be measured using digital calipers.

What is the difference between scalar and vector quantities?

Scalar quantities have only magnitude, while vector quantities have both magnitude and direction.

What is the SI unit for time?

The SI unit for time is the second (s).

whats the SI unit for mass

kilogram(KG)

SI unit for electric current

ampere (A)

when using a metre rule, why should our eyes be positioned such that our line if sigh is perpendicular to the rule?

to avoid parallax errors which can lead to inaccurate measurements

whats is the period of a simple pendulum

The period of a simple pendulum is the time it takes for the pendulum to complete one full swing back and forth. It is determined by the length of the pendulum and is independent od the masss of the pendulum bob

what are scaler quantities

physical quantities that only have magnitude

what are vector quantities

physical quatities that have both magnitude and direction