Delhi Public School Official Page 20-21/class 6 -Chapter 10- Mo… · Web viewAn elastic...

Class 6Physics

Chapter 10: Motion and measurement of distancesDay 1:Topic: Story of transport, How wide is this desk?Study: Topic 10.1 and Topic 10.2 (From page no. 95 to 97, NCERT textbook)Bullet points based on this topic:

Means of transport in Ancient Times: Movement on foot, Animals, Logs of wood.

Remarkable change in the transport system : Invention of wheel Invention of Steam Engine

Modern Modes of transport: Land - Bus, Car Water – Ship, Submarine Air – Airplane, Helicopter

20th century inventions: Supersonic planes, space craft, electric trains, monorail etc

Measurement: Method of comparing a given physical quantity with a standard or constant quantity.

Result of measurement is expressed in two parts - a number and its unit.

Questions and answers to be done in the Physics Class work Copy:1. Name two ancient means of transport.

Ans: Two ancient means of transport are movement on foot and logs of wood2. Give two examples each, of modes of transport used on land, water and air.

Ans: On Land - Bus, Train In Water – Ship, Boat In Air – Airplane, HelicopterRead and learn the bullet points as well as the questions and answers.

Revision questions to be practised in a rough copy that needs to be monitored by the parent:

i. Name two new inventions which brought a remarkable change in the transport system.

ii. How is the result of a measurement expressed?iii. What is measurement?

Day 2:Topic: Some Measurements (Activity 1 and Activity 2), Standard Units of MeasurementsStudy: Topic 10.3 and Topic 10.4 (From page no. 97 to 99, NCERT textbook)Bullet points based on this topic:

Ancient modes of measurement: Foot: length from the heel to the big toe. Cubit: length between the tip of the middle finger and the elbow.

Handspan: the width of human hand measured from the tip of the thumb to the tip of the little finger.

Yard: it is the distance between the chin to the tip of the stretched arm. Unit : Measurement means the comparison of an unknown quantity with some known

quantity. This known fixed known quantity is called a unit. Modern units of measurement : m, cm, km etc SI Unit : System of standard units internationally accepted. SI unit is used for the sake of convenience and uniformity. S I Units of measurement :

Length: m Mass: kg Time: s Temperature: K

Questions and answers to be continued in the Physics Class work Copy:3. Why can a pace or a footstep not be used as a standard unit of length?Ans: A pace or a footstep cannot be used as a standard unit of length because the length of the feet varies from person to person and hence the measurement will not be accurate.

Read and learn the bullet points as well as the questions and answers.


iv. Why is SI unit used all over the world?v. Why can’t we use hand span as standard unit of length?vi. What is meant by a unit?

Day 3:Topic: Correct Measurement of Length (Activity 3) , measuring the length of a curved line (Activity 4)Study: Topic 10.5 and Topic 10.6 (From page no. 99 to 101, NCERT textbook)Bullet points based on this topic:

Distance: actual path length covered by a moving body. The length of a curved line can be measured by using a thread and a scale.

Questions and answers to be continued in the Physics Class work Copy:

5. While measuring the length of a knitting needle, the reading of the scale at one end is 3.0 cm and at the other end is 33.1cm. What is the length of the needle?Ans: Reading at one end = 3.0cm

Reading at the other end = 33.1cm Therefore, the length of the needle = 33.1 – 3.0 = 30.1cm

6. Why could you not use an elastic measuring tape to measure distance? Ans : An elastic measuring tape is stretchable. So, the length of the elastic measuring tape

will change each time due to stretching. So, it will not give correct measurement of

distance. Therefore, we cannot use an elastic measuring tape to measure distance.



vii. You are given a metre rod and a measuring tape. Which device will you use for measuring each of the following: a. Length of a table b. Girth of a ball

viii. Define distance

Day 4:

Topic: Correct Measurement of Length (Continued)Study: Topic 10.5 (From page no. 99 to 101, NCERT textbook)

Bullet points based on this topic:

Precautions to be taken while measuring the length of an object: 1. The scale should be placed in contact with the object along its length.

Fig: (a) Correct (b) Incorrect method of placing the scale along the length to be measured

2. While reading the scale our eye must be placed exactly in front of the point where the measurement is to be taken.

Fig: Proper position of the eye for taking reading of the scale

3. If the scale has a damaged zero mark or broken left end, we should measure the length of an object starting from 1cm mark of scale and then subtract 1cm from the reading taken at the right end to get the actual length of the object.

Fig: (a)Incorrect (b) Correct method of placing the scale with broken edge


7. Mention three precautions to be taken while measuring the length of an object. Ans: The precautions to be taken while measuring the length of an object are

a. The scale should be placed in contact with the object along its length.b. While reading the scale our eye must be placed exactly in front of the point where the

measurement is to be taken

c. If the scale has a damaged zero mark or broken left end, we should measure the length of an object starting from 1cm mark of scale and then subtract 1cm from the reading taken at the right end to get the actual length of the object.



ix. A 30cm scale has a broken end. The mark at the broken end is 1.6cm.a) Which mark of the scale will you use for measuring the length of an object?b) How much will you subtract from the scale reading at the other end of the object

to get the correct length?Day 5:Topic: ConversionsStudy: Page no. 99 (NCERT textbook)Bullet points based on this topic:

Kitten Hate Dogs But Do Chase Mice K=Kilo, H=Hecto, D=Deca, B=Base (m,g,l), D=Deci, C=Centi, M=Milli

1m=100cm=1000mm 1cm=10mm 1km=1000m 1hr = 60mins = 3600s 1min = 60s 1mile = 1.6km 1foot = 12inch = 30cm 1quintal =100kg 1metric ton=1000kg


8. Convert the following:a) 2m into cmWe know that 1 m = 100 cm∴ 2 m = (2 × 100)cm = 200 cm

b) 10mm into mWe know that 1 m = 1000 mm

Or 1mm = 1/1000 m∴ 10 mm = (10/1000)m = 0.01m

c) 5km300m into mWe know that 1km = 1000 m

∴ 5 km300m = (5 × 1000 + 300)m = (5000 + 300)m = 5300m

d) 7kg into gWe know that 1kg = 1000 g∴ 7 kg = (7 × 1000)g = 7000g

e) 8kg 500g into gWe know that 1kg = 1000 g

∴ 8 kg500g = (8 × 1000 + 500)g = (8000 + 500)g = 8500g

f) 9hours into minsWe know that 1hour = 60minutes∴ 9 hours = (9 × 60) minutes =540 minutes

g) 50g into kg We know that 1 kg = 1000 g

Or 1g = 1/1000 kg∴ 50 g = (50/1000) kg = 0.05 kg

h) 2hours into secondsWe know that 1hour = 3600s∴ 2 hours = (2 × 3600)s =7200s

i) 526cm into mWe know that 1 m = 100 cm

Or 1cm = 1/100 m∴ 526 cm = 526/100 = 5.26 m

9. The height of a person is 1.65m. Express it into cm and mm. Ans : Height of the person = 1.65 m

We know that 1 m = 100 cm

1.65 m = (1.65 ×100)cm = 165 cm∴

Again, 1 m = 1000 mm

1.65 m = (1.65 × 1000)mm = 1650 mm∴

Thus height of person in cm = 165 cm

and height of person in mm = 1650 mm

10. The distance between Radha’s home and her school is 3250m Express this distance into km.

Ans: The distance between Radha’s home and her school = 3250 m.

We know that 1 km = 1000 m

Or 1m = 1/1000 km

Thus, 3250 m = (3250/1000)km = 3.25 km

Therefore, distance between Radha’s home and her school = 3.25 km



x. The distance between two stations of Delhi Metro is 2.460km. Express the distance in a) metre b) centimetre.

xi. How many centimeters are there in 2.5m?xii. Convert the following:

a. 525 m into kmb. 40 minutes into hourc. 7345 g into kg

Day 6:Topic: Moving things around us (Activity 5 and activity 6)Study: Topic 10.7 (Page no. 102, NCERT textbook)Bullet points based on this topic:

Rest : A body is said to be at rest if there is no change of position with respect to its surroundings and time.

Motion : A body is said to be in motion if there is change of position with respect to its surroundings and time.


11. Give three examples of rest.Ans: a. A book kept on a table b. A clock fixed to a wall c. A bird sitting on a branch of a tree

12. Give three examples of motion.Ans: a. A rolling ball b. A flying aeroplane c. A moving train



xiii. Differentiate between rest and motion.

Day 7:Topic: Types of Motion ( Activity 7) Study: Topic 10.8 (From page no. 103 to page no.105, NCERT textbook)Bullet points based on this topic:

Rectilinear Motion : Motion of a body in a straight line

e.g.; 1. Motion of a train on a straight track. 2. The march-past of soldiers.

Circular Motion : Motion of a body along a circular path.e.g; 1. The movement of tip of the hand of a watch on the dial. 2. A point marked on the blade of a fan

Rotational Motion : Motion of a body around a fixed axis.e.g; 1. A spinning top 2. The spinning of the earth on its axis.

Periodic Motio n: Motion which repeats itself after regular intervals of time e.g.1. The pendulum of a clock 2. The revolution of the earth around the sun

Oscillatory Motion : The to and fro motion of a body about its mean position.e.g;1. Motion of a child on a swing. 2. Motion of the branch of a tree moving ‘to and fro’

Random Motion : Motion which do not follow any fixed path.e.g; 1. A football moving while playing. 2. The movement of fish in water.


13. Write one similarity and difference between the motion of the wheels of a bicycle and the blades of a ceiling fan that has been switched on.

Ans: The similarity between the motion of a bicycle and a ceiling fan is that both the

wheels of bicycle and the fan are moving around a fixed point and possess circular

motion.

The difference between the motion of a bicycle and a ceiling fan is that a bicycle

has rectilinear motion as it moves forward, whereas ceiling fan does not possess

the rectilinear motion.

14. Give two examples of periodic motion.Ans: 1. The pendulum of a clock 2. The revolution of the earth around the sun



xiv. Differentiate between rotational motion and circular motion.xv. Define periodic motion. xvi. Give two examples of rectilinear motion.

Revision test to be done in loose sheets and supervised by the parents

(Full Marks 20)

VSA type (1 Mark each) 1. A girl uses a worn out ruler to measure the length of a table in her room. She placed

the ruler such that the mark 3.0 cm coincides with one end and the other end coincides with the mark 33.5cm. The length of the table is :a. 33.5cmb. 36.5cmc. 33.8cmd. 30.5cm

2. Which of the following is correct:a. 100mm = 1cm.b. 10mm=1mc. 100cm= 1md. 100m = 1km3. Give one example of circular motion.4. Name the type of motion in which an object moves along a straight path.5. What is the smallest length which can be measured accurately by using a metre scale?6. How many centimeters are there in3.5m?7. Define periodic motion.8. What is rotational motion. SA type 9. Convert the following: a) 9200 g into kg and b) 5m into km ( 2 + 2 = 4)10. Give the unit for measuring the following: (1/2 X 4 =2)

a. Length of your shoe laceb. Length of your eraserc. Distance between Delhi and Jaipurd. Thickness of a coin

SA type (3 Marks) 11. State any two precautions to be taken while measuring the length of an object with

diagram. 12. Define distance.The distance between two places is 5.930km. Express the distance in

a) metre b) centimetre.

Delhi Public School Official Page 20-21/class 6 -Chapter 10- Mo… · Web viewAn elastic...

Documents

Transcript of Delhi Public School Official Page 20-21/class 6 -Chapter 10- Mo… · Web viewAn elastic...