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Clocks

Clocks are used to measure time and allow people to agree on a shared understanding of time. Early forms of clocks included sundials, which used shadows to indicate time, and candle clocks or hourglasses, which measured the passage of time by the melting of wax or draining of sand. Mechanical clocks from the 13th century used a system of moving gears powered by weights or pendulums. Modern clocks include digital clocks with displayed numbers and auditory clocks that announce the time aloud. Clocks are now integral parts of modern life and society.

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94 views1 page

Clocks

Clocks are used to measure time and allow people to agree on a shared understanding of time. Early forms of clocks included sundials, which used shadows to indicate time, and candle clocks or hourglasses, which measured the passage of time by the melting of wax or draining of sand. Mechanical clocks from the 13th century used a system of moving gears powered by weights or pendulums. Modern clocks include digital clocks with displayed numbers and auditory clocks that announce the time aloud. Clocks are now integral parts of modern life and society.

Uploaded by

mervetiryaki
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Clocks

Clocks are used to measure time. Clocks are used to show the time. Clocks are used so
that people can agree on the time. People use clocks to measure units of time that are shorter
than natural units. Natural units are the day, the month, and the year. The sun rises at the
beginning of each day. The moon is new at the beginning of each month. The sun appears at
the same place 5 in the sky at the beginning of each year. The clock is a very old invention.
Sundials were used in ancient times. Sundials work by measuring shadows that are cast by the
sun. Candle clocks were used a very long time ago. Candle clocks work by measuring the
time it takes for the wax to melt. Hourglasses are similar to 10 candle clocks because they
also measure the time it takes for something to happen. Hourglasses work by measuring the
time it takes for sand to pour through a small opening into a glass. Mechanical clocks
appeared in the 13th century in Europe. They work with a system of moving gears. The gears
always move at the same speed. Pendulum clocks work with a swinging weight. The swinging
weight is called a pendulum. The pendulum makes the clock parts move. 15 Now people
typically use mechanical clocks or digital clocks. Digital clocks show numbers on a screen.
The numbers represent the time. Some people use auditory clocks. Auditory clocks use
language to tell the time aloud. Computers also use clocks. Computers use internal clocks in
order to work properly. In today’s world, clocks are everywhere –– in homes, schools, offices,
and public places. 20 Many people live their lives according to the clock. People go to work
and return home according to the clock. School days start and end according to the clock.
Airplanes take off and land according to the clock. It is fun to imagine a world without
clocks!
Questions
1.. According to the passage, which of the following statements is/are true?
I) The clock is people’s oldest invention.
II) Sundials were the first kind of clock that people invented.
III) Mechanical clocks contain gears.

A) I only
B) II only
C) III only
D) I and II only
E) II and III only

2.. What is the main idea of the third paragraph?


A) Why clocks are used
B) How sundials work
C) How hourglasses are similar to candle clocks
D) What types of clocks have been invented
E) How mechanical clocks are different from digital clocks

3.. In line 16, auditory most closely means


A) related to machines
B) related to numbers
C) related to hearing
D) related to moving parts
E) related to the sun

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