# Inertia

#### Students’ Learning Outcomes

·         Describe the term inertia.

#### Information for Teachers

·         The property of an object due to which it resists against any change in its state of rest or of motion is called inertia.
·         The mass of an object ia a measure of its inertia.
·         The larger the mass of an object the greater is its inertia, that is, the more difficult it is to move it when at rest and to stop it when in motion.

#### Material / Resources

Cupboard, book, Card, 5 rupees coin, jar or glass and paper sheets, textbook.

#### Worm up Activity

·         Ask a student to move a heavy cupboard or any other heavy object placed in the classroom and then ask can it be moved easily?
(Students’ response: No, it is very difficult to move a cupboard)
·         Ask the same student, to move the book lying on the table. Is it easy to move it?
(Students’ response:  Yes it can be moved very easily)
·         Explain to the students that the cupboard is more ‘reluctant’ to be moved than the book. We call this reluctance as “inertia”.
·         Ask the students: is it easy to stop a heavy moving object like a car by hand?
(Students’ response:  No, it is very difficult).
·         Ask them why is it difficult? 9 Because more mass needs more force to stop it that is more mass offers more resistance against its motion.
·         Then inform them that the property of an object due to which it resists against any change in its state of rest or of motion is called inertia.
·         The mass of an object is a measure of its inertia.

#### Activity 1

·         Place a piece of cardboard on an empty jar or a glass. Put a 5 rupee coin on the card.
·         Instruct a student to flick the card sharply with his/ her finger.
·         For conceptual understanding ask the following question:
·         Does the card fly off?
(students’ response: Yes).
·         Does the coin also fly off with the card?
(Students’ response: Card flies off but the coin doesn’t).
·         What happens to the coin?
(Students’ response: it falls down into the jar vertically below the point where it was placed).
·         What does it show?
(Students’ response:  It shows that coin resists to move away along with the card under the action of a force.

#### Activity 2

·         Show a student several sheets of paper and a heavy book. Place one of the sheets on the edge of the table and put the book on it.
·         Ask a student to pull the paper quickly from the table and ask what happens to the book and why?
(Students; response:  The book doesn’t move from its position due to inertia.)

#### Sum up / Conclusion

Ask the students.  What have you learnt from today’s lesson and write the conclusions on the board:
·         The larger the mass of an object the greater is its inertia. That is, the more difficult it is to move it when at rest and to stop it when in motion.
·         The property of an object due to which it resists against any change in its state of rest or of motion is called inertia.

#### Assessment

Ask the students the following assessment questions:
·         Why is it difficult to move heavy objects?
·         Why do light objects move easily?
·         Explain why is it not easy to stop a moving car by hand?
·         Why the coin doesn’t fly off along with the card?
·         Involve the students in solving the questions given at the end of chapter / unit in textbook.

·         Survey your classroom to find things which offer less resistance when set into motion.

Discuss where more force is required to stop or move the things in everyday life. Make a list of

### 1 thought on “Inertia”

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