SELF LEARNING KIT GRADE 4 QUARTER 4 MODULE 6, Lecture notes of Earth science

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LENGTH OF SHADOWS AS THE

POSITION OF THE SUN CHANGES

For Science Grade 4

Quarter 4 / Week 6

FOREWORD

This self-learning kit will serve as a guide in describing

the changes in the position and length of shadows in the

surroundings as the position of the sun changes. It will be

your aid as you learn new ideas and enrich your existing

knowledge about scientific concepts.

In this learning you will gain knowledge in describing

the changes in the position and length of shadows in the

surroundings as the position of the sun changes.

PRE-ACTIVITIES/PRETEST

ACTIVITY 1

Look at the picture below and observe it properly. Answer the questions that follow. Write your answer in your notebook.

https://www.blendspace.com/lessons/b6V3agC1ZMVm5g/shadows

Questions:

1. What are the objects found in the picture?
2. Which object produces light?
3. Does the light pass through the tree? Why?
4. What is formed when the light is blocked?
5. Can the length of our shadows determine the time of the day?

ACTIVITY 2

Study each illustration. Answer the questions that follow. Write the letter of your answer in your notebook.

https://www.nagwa.com/en/worksheets

1. When the sun is high in the sky, the shadow is __________? A. Shorter C. Bigger B. Longer D. Taller
2. When the sun is low in the sky, the shadow is __________? A. Shorter C. Bigger B. Longer D. Taller

https://www.nagwa.com/en/worksheets

Have you ever been followed by your shadow? Or have you ever followed it? When there is no light there is no shadow. As light travels in a straight line, then it is blocked with an object, there is a formation of shadows. The object does not let the light pass through it. So, shadow is formed when light travelling to a source is blocked.

 Based on the illustration, what object blocked the rays of the sun?  What is formed?

The tree blocked the rays of the sun which caused the

formation of the shadow.

B. Why do shadows change in position and length?

Science 4, Learners Material page 304

Study the picture above. Answer the questions that follow.

1. Describe the shadow of the pole at 8:00am, 10:00 am, and 12:00 noon?
2. At what time is the shadow of the pole longest? Why is this so?
3. At what time is the shadow shortest? Why?

DISCUSSION:

Remember These

 Light rays travel in a straight line. When light is blocked with

an object, shadow will be formed.

 In the morning, as the sun rises or sets in the afternoon , it is low

on the horizon, its light rays are slanted as they hit the ground, longer

shadows are formed. When the sun is high or nearly above the

horizon, the sunlight strikes the ground at nearly a right angle so a

shorter shadow is formed. When the sun is directly above the

horizon , the light rays of the sun strike directly above the object so

no visible shadow is seen on the ground since the shadow of the

entire body would fit in the footprints.

 The changes in the position and length of shadows in the

surroundings depend on the angle at which the sunlight strikes the

object to the ground.

 Difficult word:

Horizon - the line where the earth seems to meet the sky.

2. What happens when a light ray cannot pass through an object/material?

A. The object creates a dark spot. B. The object creates a shadow. C. The object creates a reflection. D. The object creates a light spot.

3. Which of these pictures is the correct position of the shadow?

https://www.nagwa.com/en/worksheets

A. B.

4. What is the position of the sun when the shadow is shortest?

https://www.nagwa.com/en/worksheets

A. The shadow is shortest when the sun is directly above an object. B. The shadow is shortest when the sun is low in the sky. C. The shadow is shortest when the sun is high in the sky. D. The shadow is shortest when the sun is hiding behind the cloud.

5. What is the position and length of a shadow at different times of the day?

https://www.blendspace.com/lessons/b6V3agC1ZMVm5g/shadows

A. The position and length of shadows change. B. The position and length of shadows do not change. C. The position and length of shadows remain the same. D. The position and length of shadows stay in one place.

B. Directions: Fill the missing words. Choose your answers from the

words printed in the flashlight. Do it in your notebook.

Light and Shadow

Light travels in a (1) _____________ line from a source of light that

bounces off an object. When an object blocks out the (2) __________, a (3) ___________ is formed. Shadows are (4)

____________ at midday and (5) _____________ at the beginning and end of the day.

shadow straight shortest

light longest

https://www.collinsdictionary.com/dictionay/english/torch

DEPARTMENT OF EDUCATION

SCHOOLS DIVISION OF NEGROS ORIENTAL

SENEN PRISCILLO P. PAULIN, CESO V Schools Division Superintendent FAY C. LUAREZ, TM, Ed.D., Ph.D. OIC - Assistant Schools Division Superintendent Acting CID Chief NILITA L. RAGAY, Ed.D. OIC - Assistant Schools Division Superintendent

ROSELA R. ABIERA Education Program Supervisor – (LRMDS) ARNOLD R. JUNGCO PSDS – District Science Coordinator

MARICEL S. RASID Librarian II (LRMDS) ELMAR L. CABRERA PDO II (LRMDS)

RONELE O. ZUÑIGA Writer/Illustrator

ZENLI ROSE B. MONGCUPA Lay-out Artist

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ALPHA QA TEAM MAXIMA P. BALANSAG AIME D. FERRER RANDOLPH V. FUENTES MA. LOUANIE I. SASTRE BETA QA TEAM DORIN FAYE D. CADAYDAY MERCY G. DAGOY MARY JANE E. ELMA MARIA ELVIE E. SIENES JIMUEL SUN, Ed.D. CRISTITA R. TINGUBAN DISCLAIMER The information, activities and assessments used in this material are designed to provide accessible learning modality to the teachers and learners of the Division of Negros Oriental. The contents of this module are carefully researched, chosen, and evaluated to comply with the set learning competencies. The writers and evaluator were clearly instructed to give credits to information and illustrations used to substantiate this material. All content is subject to copyright and may not be reproduced in any form without expressed written consent from the division.

SYNOPSIS

ABOUT THE AUTHOR/ILLUSTRATOR

Ronele O. Zuñiga graduated at Negros Oriental State University-Bayawan-Sta. Catalina Campus, with a degree of Bachelor of Science in Elementary Education with an area of concentration in General Science. As of now, she is a Grade 4 adviser at Ambrocio M. Ramirez Central Elementary School, Sta. Catalina II District. She is also the School DRRM Coordinator.

This Self Learning Kit helps us understand the learning competency on describing the position and length of shadow at different times of a day.

You are expected to gain knowledge and skills in this learning competency in which what you have learned will be the basis in your daily living.

So, learners, join us as we study this self-learning kit to equip our minds with scientific concepts which we can use in dealing with our everyday life.

Answer Key

Activities - Pre

Act. 2 1 Act.

1.A tree .1. sun,

2. B 2. sun
3. D 3. No, the tree blocked the light
4. A 4. Shadow
5. A 5. yes

#1 Let’s Try This #1 Let’s Try This

.B A. 1.False

1. straight 1. A 2. True
   2. light 2. B 3. True
   3. shadow 3. B 4.True
2. Shortest 4. C 5. False
3. longest 5. A