Measurement of Length and Motion Flashcards

Vocabulary flashcards covering the concepts of linear measurement, scales, and various types of motion based on the lecture notes.

Distance

The length of the space between two places (points).

Measurement

A process of comparing an object with a standard unit of measurement.

Standard units of measurement

A unit of measurement which has a fixed value which does not change from person to person or place to place.

SI Unit of length

The $\text{metre}$.

Motion

The movement of an object when its position changes with time, such as a moving car, a spinning top, or the hands of a working clock.

Rest

When an object is stationary or not moving with respect to its surrounding, such as a book lying on a table.

Rectilinear motion

Motion in a straight line, such as the movement of bullets fired from a gun, the march-past of soldiers in a parade, or the motion of a falling stone.

Circular motion

When an object moves along a circular path, such as the movement of the moon around the earth or the tip of hands of a clock on the dial.

Rotational motion

When an object turns (or spins) about an axis, such as the motion of a spinning top, the rotation of the earth on its axis, or the turning of a potter’s wheel.

Periodic motion

The motion which repeats itself after a regular interval of time, such as the revolution of the earth around the sun, a clock pendulum, or a guitar string.

Oscillatory motion

The to and fro motion of the body about its fixed position; it is a type of periodic motion.