Here are the answers to the questions: 1) The SI unit of distance is meter. 2) A candle clock uses a slow burning thin standard candle with many markings. Each marking indicates the passing of a unit of time as the candle burns throughout the day and night. 3) Period between two events is called time. 4) Identify the measure which is not primitive - D) cubit 5) Give the full form A) FPS system - Foot-Pound-Second system B) MKS system - Meter-Kilogram-Second system C) CGS system - Centimeter-Gram-Second system

1. Motion and time
Group members
1. Sarthak
2. Rachiit
3. Rudra
4. Vihaan
5. Sriyan
6. Viaan

2. Introduction
It is clearly evident that all these statements are related to
time. The word 'time’ is so often used in our daily lives. Don’t
you think we should know how this concept of time came
into existence

3. Time
By Rachit Telawane

4. Introduction to Time
 Like legnth, mass. Electriccurrent and temperature, time is also one of the mostimportant
fundamental physicalquantities.Timeis so essentiallyand fundamental to us that it affects
all aspects of humanlife.
 But how do you define Time?
Time is the period between two events.Time also defines numerous other quantities of
science, suchas speed. Furthermore, all possible motionsin the universecan onlyoccur
through time. Motionand time are this inseparable

5. Did you know?
 The science that includes the study and measurement of time is
called horology.
 A scientific researcher who studies the science of horology, are
known as horologist

6. Time is a Physical quantity
 We know Timeis physical quantity and it can be measured.Each physical quantity has
one or more units of measurement.
 For example,when we buy apples from a market, the apple vendor wouldask you, "How
many kilograms of apples do you want?" Here kilogram is a unit of mass and it measures
the amount of apples. Similarly,timehas units of measurementlike,seconds,minutes,etc.
 In short, A unit of measurementof a quantity tells us one thing about the quantity suchas
magnitude, scale,size, degree, enormity,level and amount.

7. STANDARD UNIT OF
MEASUREMENT
By Rudra Kulkarni
7-C
Roll no. 38

8. What is STANDARD UNIT OF MEASUREMENT?
A standard unit of measurement is a quantifiable language
that helps everyone understand the association of the
object with the measurement. It is expressed in inches, feet,
and pounds, in the United States, and centimeters, meters,
and kilograms in the metric system.
The standard measurement units are much more commonly
known worldwide than nonstandard. Some examples of the
most common standard measurements include: feet,
inches, yards, miles, gallons, pounds, grams

9. What is the use of STANDARD UNIT OF MEASUREMENT?
We need standard unit for measurementto make
our judgement more reliable and accurate. For
proper dealing, measurementshould be same for
everybody.Thus there should be uniformityin
measurement. For the sake of uniformity we need a
common set of units of measurement, whichare
called standard units.NowadaysSI units in science
and technology almost accepted universally.

10. What is the SI system of Measurement?
SI unit is an international system of measurements that are
used universally in technical and scientific research to avoid
the confusion with the units. Having a standard unit system is
important because it helps the entire world to understand
the measurements in one set of unit systems.To use SI units,
we need to know each measured value. For example, to
use SI units to express velocity, we need the travelled
distance in metres and the time it took to travel that
distance in seconds.
Unit of Mass: Unit of Velocity
Unit of Time: Unit of Viscosity

11. Some important points:
 SI is the abbreviationof “Systeme International d’Unites” in French.
 FPS system= (foot , pound, second)
 CGS system= (centimetre , gram, second)
 MKS system= (metre , kilogram , second)
 Degree Celsius (°C) or Degree farenheit( °F)
 The SI unit is made up of 7 base units that define the 22 derivedunits
with special names and symbols.

12. Multiples and Sub-Multiples of
SI units
Presented by Vihaan

14. Multiples of standard SI units

15. Sub- multiples of standard SI units

18. For example, the unit of time interval between one sunrise and the next is called a day. The time period from
one sunset to sunrise is called night. Similarly, the time interval between one new moon and the next is called
a month. A year is measured as the time taken by the Earth to complete one revolution
around the Sun. Such commonly used, units of time are listed below in the table. Now-a-days, we measure
time with the help of the clocks or watches and by using calendars. Humans have been Using numerous
Devices for the measurement of time since ancient times. Let us today some of these devices which are
Present below.
60 seconds (s) = 1 minute (min)
60 minutes (min) = 1 hour (h)
24 hours (h) = 1 day
7 days = 1 week
Between 28 to 31 days = 1 month
12 months = 365 or 366 days = 1 year
10 years = 1 decade
10 decades or 100 years = 1 century
10 centuries or 1000 years = 1 millennium

20. Instrument used for measuring time
earlier
1)Sundial or shadow clock
A sundial or a shadow clockwas used in long timeago to measurethe intervals of timeshorter than a day .
The deviceworkers on the principlethat the positionof the sky changed, so did the position and length of
the shadow cast by an object. The sundial has a triangular metallicplate calledgnomonfixed verticallyat
the centre of the plate. the deviceis placedin the open in such a way that the gnomonpoints in the north-
south direction.The shadow of the gnomonon the circular scaleshows the timeat the particular
movements.

21. Instrument used for measuring time
earlier
2)Hourglass
An hourglass (or sand-glass,sand timer,or a clock)is a deviceused to measurethe duration of time.This
workers on the principlethat a definitequantity of sands takes a constant timeto fall from the upper
chamber to the lower chamber. It cannot be used to find the exact time,but can be used to measurethe
predeterminedtime interval.

22. Instrument used for measuring time
earlier
3) Water clockor clepsydra
The water clockis also known as clepsydra. To measurethe timeit uses the fact that the equal amountof
water takes the same intervalof timeto flowthrough an opening.

23. Instrument used for measuring time
earlier
4)Candle clock
A candle clockhas been used since antiquity. For measurementof time a candle clock uses slow burning
thin standard candle with many marking.Each markingindicates the passing of a unit of timeas candle
burns throughout the day and night. A candle clockwas a effectiveway to measuretimeindoors despite
the rain, night, or any other environmentalcondition

24. Question And Answers
1)The SI unit of distance is-
2)Describethe working of candle clock
3)Period between two events is called-
4)Identifythe measure which is not primitive-
D]cubit
A]yard B]meter C]hand span
5)Give the full form
A)FPS system
B)MKS system
C)CGS system