INERTIA

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UNDERSTANDING INERTIA

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OBJECTIVESBy the end of this lesson student is

able to:

Explain what inertia is Relate mass and inertia Give example of situations involving

inertia Suggest ways to reduce the negative

effects of inertia

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IDEA OF INERTIA

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The bus stop suddenlyThe passenger jerk forward

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The bus moves suddenlyThe passenger jerk backward

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A ladder is strapped to the top of a painting truck. As the truck moves down the road, the ladder moves with it. The ladder shares the same state of motion as the truck. When the truck stop suddenly, the ladder is more likely to maintain its state of motion. Thus it jerk forward.

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STATE OF MOTION

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DEFINITION OF INERTIA (Newton's First Law of Motion)

An object at rest tends to stay at rest and an object in motion tends to stay in motion with the same speed

and in the same direction unless acted upon by an unbalanced force

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The resistance an object has to a change in its state of motion

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EVERYDAY APPLICATIONS OF INERTIA

(NEWTON'S FIRST LAW)

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The head of a hammer can be tightened onto the wooden handle by banging the bottom of the handle against a hard surface

To dislodge ketchup from the bottom of a ketchup bottle, it is often turned upside down and thruster downward at high speeds and then abruptly halted.

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Blood rushes from your head to your feet while quickly stopping when riding on a descending elevator.

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THE RELATIONSHIP BETWEEN INERTIA AND

MASS

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What will happen to the pail that is full with sand compared to the empty pail when it is push by the student?

What will happen when the student tries to stop the moving pail?

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It is hard to moves the full pail of sand compared to the empty pail

It is hard to stops the full pail of sand compared to the empty pail

Conclusion:-

The massive object has the great inertia compared to the light object

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RELATIONSHIP BETWEEN INERTIA AND MASS

The bigger the mass of an object the greater the inertia of the object