# GRAVITATION AND WEIGHTLESSNESS

Class :

JSS 1 / Basic 7

Subject :

Basic Science and Technology

Topic :

GRAVITATION AND WEIGHTLESSNESS

Term : Third Term

Week : Week 6

Instructional Materials :

• Throw a stone up

Reference Materials

• Scheme of Work
• Online Information
• Textbooks
• Workbooks
• 9 Year Basic Education Curriculum

Previous Knowledge :

The pupils have previous knowledge of

SPACE TRAVEL

which was the topic that was taught during the last lesson

Behavioural Objectives :  By the end of the lesson, the learners should be able to

• Say what is gravitation
• Define the term weightlessness.
• list the EFFECT OF GRAVITATION ON OBJECTS

CONTENT

GRAVITATION AND WEIGHTLESSNESS

MEANING OF GRAVITATION

Gravitation is a force that has effect on the stability of a body. If an object is tossed up the air, it will fall back to the ground because the earth exerts an attraction on it. This attraction is called gravitational attraction.

The gravitational attraction / force between any two object increases as the two objects approach each other.The earth has a great gravitational pull because it has a great mass. The gravitation pull of the earth is always directed to the centre.

WEIGHTLESSNESS

Weightlessness is a feeling of being weightless. It does not mean having no weight. As someone move away from the surface, it progressively reduces. In the outer surface of the earth, a person or body has no weight because the gravitational pull of the earth is no longer acting there.

EVALUATION

1. What is gravitation?

2. Define the term weightlessness.

EFFECT OF GRAVITATION ON OBJECTS

1. Stability on Earth: Gravitation help every object in the earth include man to remain stable.
2. Weight: The weight of an individual is a measure of the gravitational pull of the earth on that person.
3. Revolution of the Moon round the Earth: Moon is able to revolve round the earth because the gravitational pull of the earth attracts it.
4. Balance of Planets in our Solar System: The sun and all the planets in our solar system exercise gravitational pulls on one another and mutually balance on another in space.
5. Work is done against gravity in lifting an object form the Earth: Lifting an object from the ground involves opposing gravitational pull, therefore work is done against gravitational attraction of the earth.

Presentation

The topic is presented step by step

Step 1:

The class teacher revises the previous topics

Step 2.

He introduces the new topic

Step 3:

The class teacher allows the pupils to give their own examples and he corrects them when the needs arise

EVALUATION

1. Define gravitational pull.
2. State four effects of the gravitational pull.

• Precious seed BASIC SCIENCE FOR JUNIOR SECONDARY SCHOOLS BOOK 1 page 162-166
• Nigerian Basic science Project pg 95-99.

GENERAL EVALUATION

1. What is gravitation?

2. Define weightlessness.

3. Define gravitational pull.

4. State four effects of the gravitational pull.

5. Describe the effect of gravitation on stone, a feather and a book.

WEEKEND ASSIGNMENT

1. When a metal ball of 20kg and a wooden ball of 10kg are dropped from the some height A. the metal ball reach the ground before wooden ball B. both balls will reach the ground at the same time C. the wooden ball falls faster than metal ball D. the metal ball null full sideways.
2. Gravitational force is a force of ____ A. separation B. attraction C. friction

D. opposition.

1. The earth has a large gravitational pull on object because the earth A. has plants and animals B. is a planet C. is large in size D. revolves.
2. The earth’s gravitational pull on an object is represented by that object’s A. weight

B. size C. volume D. materials.

1. The ability of an object to remain stable on earth is due to ____ A. gravitational pull B. weightlessness C. moon and earth sizes D. its height.

THEORY

1. Describe the effect of gravitation on stone, a feather and a book.

2. Where does object become weightless and why?

Conclusion :

The class teacher wraps up or conclude the lesson by giving out short note to summarize the topic that he or she has just taught.

The class teacher also goes round to make sure that the notes are well copied or well written by the pupils.

He or she does the necessary corrections when and where  the needs arise.

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