Дистанційне навчання

 5-Д

PACE WORK (Science) 29/04

Тема: Час. Типи годинників.

Введення нових лексичних одиниць.

Clock - a timepiece that shows the time of day

Sun - noun  (often initial capital letter) the star that is the central body of the solar system, around which the planets revolve and from which they receive light and heat: its mean distance from the earth is about 93 million miles (150 million km), its diameter about 864,000 miles (1.4 million km), and its mass about 330,000 times that of the earth; its period of surface rotation is about 26 days at its equator but longer at higher latitudes.

Hour - a period of time equal to one twenty-fourth of a mean solar or civil day and equivalent to 60 minutes: "He slept for an hour.”

Minute - the sixtieth part (1/60) of an hour; sixty seconds.

Write the words into vocabularies.

Make a sentence using all these words.

Pre-reading activities:

Questions:

Why do we need clocks?

Do you often use the clocks? What for?

Reading.

Sundials are the oldest known instruments for telling time. The surface of a sundial has markings for each hour of daylight. As the Sun moves across the sky, another part of the sundial casts a shadow on these markings. The position of the shadow shows what time it is.

The flat surface of a sundial is called a dial plate. It may be made of metal, wood, stone, or other materials. …

An hour glass, also known as a sand glass or a sand clock, keeps time. When the hour glass was invented in the third century in Alexandria, it was sometimes worn like a watch on a chain. The specific length of time each hour glass measures is reckoned by how long it takes the sand inside to run from one bulb to the other.

Ancient device for measuring time by the gradual flow of water. One form, used by North American Indians and some African peoples, consisted of a small boat or floating vessel that shipped water through a hole until it sank. In another form, water escaped through a hole in a vessel marked with graduated lines; specimens from Egypt date from the 14th century BC. The Romans invented a clepsydra consisting of a cylinder into which water dripped from a reservoir; a float provided readings against a scale on the cylinder wall. Galileo used a mercury clepsydra to time his experimental falling bodies.