Дистанційне навчання 5-Д PACE WORK (29.04.2020)

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.

Post-reading activities

Match the pictures.

3

2

1

A)    Sand clock

B)    Sun dial

C)    Water clock

T/F

The surface of a sundial has markings for each hour of night. (f)

As the Sun moves across the sky, another part of the sundial casts a shadow on these markings. (t)

The flat surface of a sundial is called a dial spoon. (f)

An hour glass, also known as a sand glass or a sand clock, keeps time. (t)

Galileo used a mercury clepsydra to time his experimental falling bodies. (t)

Project

What You Need:

Stopwatch or watch that counts seconds

Very dry sand or salt

2 clean baby food jars (or other small jars) of the same size

Scissors

Heavy paper

Hole punch

Masking tape

What You Do:

Pour the very dry sand or salt into one of the baby food jars.

Using the scissors cut a piece of heavy paper that will cover the mouth of the jar. Punch a hole in the center of the paper with the hole punch.

Place the paper over the mouth of the jar. Position the second jar on top of the first, sand-filled jar so that the mouths of the two jars are together with the paper in between.

Now, tape the mouths of the jars firmly together.

Turn the jars over and watch the sand fall into the lower jar. How long does it take to fill the lower jar? Turn the sand clock over. Does it take the same amount of time every time?

Have your child practice predictive thinking by asking how she might change her sand glass to make it measure a different amount of time. How would you build an hour glass so it measures the passage of one hour?

By Jessica McBrayer