measurement & motion

8/9/2019 Measurement & Motion

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MeasurementMeasurementBy: Irene Leya Manoj


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People had to walk on foot from oneplace to another.

People used simple boats & rafts

made of tree trunks.

History of TransportHistory of Transport


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People used horses, elephants and camels.

Carts were used after invention of the

wheel.


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Trains and automobiles reduce the time to

travel.

Airplanes were faster and could cover

greater distances.


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History of length measurementHistory of length measurement

Since ancient times , people have used

several ways to measure length. During

those times , people used different body

parts to measure length. E.g.: HANDSPAN , CUBIT & FATHOM.


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Hand Span: It is the distance between the

tip of the thumb &the tip of the little finger

of a fully outstretched hand.

Cubit: It is the distance between the tip of

the middle finger & the elbow

(outstretched).


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Fathom:Fathom: It is the length of anoutstretched hand.


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Standard Unit of MeasureStandard Unit of Measure

A physical quantity such as length has to be

measured with respect to some fixed

quantity. This fixed quantity is called Unit.

Standard units are those that have value

and , therefore , do not vary from place to

place. For example , the metric system ,

created by the French in 1790 , is a

standard set of units


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Metric systemEasy method to remember the conversion table


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Length is the distance between two

objects

Length is measured in the SI unit of

meters

Length is measured with a ruler


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How to Read a Ruler

The larger lines with numbers are centimeters,

and the smallest lines are millimeters.

Since millimeters are 1/10th of a centimeter, if

you measure 7 marks after a centimeter, it is 1.7

centimeters long.

Estimate the final digit. If it is directly on the 7th

mark, the measurement is 1.70 cm.


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Measuring Length

How many millimeters are in 1

centimeter?

1 centimeter = 10 millimeters


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What is the length of the line in centimeters?

_______cm

What is the length of the line in millimeters?

_______mm

2.80

28.0


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Select A, B, or C and then tell why you chosethis measurement as the most reasonable.

Width ofa window A. 10 cm B. 10 dm C. 10 km

Diameterof a ring A. 15 mm B. 15 cm C. 15 km

Length ofa crayon

A. 8 mm B. 8 cm C. 8 dm

Length ofa car

A. 4 dm B. 4 m C. 4 km


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MOTIONMOTION What is motion ?

What are the different types of motion?

Ok! we have answers to allthese questions.


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What is motion?

When an object is

moving , it is said to be in

motion.


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EXAMPLE :

1.When an athlete is running on the ground thenhe is continuously changing his position with

respect to the audience who are sitting at rest.

2.We are continuously changing our position

since morning till night with respect to earth

which is at rest.

3.The earth is continuously changing position

with respect to sun which is at rest.


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What are the differentWhat are the different

types of motion?types of motion?

Linear motion : when a body moves either in a straight line or

along a curved path, then we say that it is executing linear

motion.

1. when a body moves in a straight line then the linear

motion is called rectilinear motion.

eg ., an athlete running a 100 meter race along a straight

track is said to be a linear motion or rectilinear motion.

2.when a body moves along a curved path then the linearmotion is called curvilinear motion.

eg., a planet revolving around its parent star


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Rotatory motion : A body is said to be in rotatorymotion when it stays at one place and turns round

and round about an axis.

example :a rotating fan,a spinning top, the earth.

Oscillatory motion : a body is said to be inoscillatory motion when it swings to and fro about a

mean position.

example : the pendulum of a clock, the swing etc.


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measurement & motion

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