PhySIcs FoRm 4

To know the exactly definition of inertia.

To analyze the relationship between inertia and mass.

To understand the effects of inertia in daily life experience.

Learning Objectives

MENU Definition of inertia Relationship betwee

n inertia and mass. Applications of inerti

a Quiz

INERTIA. At glance!Click the video to play

Inertia

Magic or trick???

Vocabulary:Resist: Menentang/melawan

Definition Inertia is the property

of matter that cause it to resist any change in its motion or state of rest

Inertia

Inertia

How could this happen???

INERTIA makes the moving object continue to move at a constant speed in the same direction unless some external force changes the object’s motion

If the object is moving…

Inertia

It tends to stay in that position unless some force puts that object into motion

If an object is at rest…

Inertia

Inertia is not physical quantity and thus it does not have units

The property of inertia is found from the Newton’s first law of motion

Newton’s First Law of Motion

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

with unless acted upon by an unbalanced force"

Inertia

Laziness!!!Hard working.

Inertia

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RELATIONSHIP BETWEEN INERTIA AND

MASS

Constant wherever it is measuredBase quantityScalar quantityThe SI unit of mass is kilogram (kg)

Mass can influence the

effects of inertia.

An object with a

larger mass has a larger

inertia.

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If the motorcycle were to abruptly stop, then the rider in motion would continue in motion. The rider would likely be propelled

from the motorcycle and be hurled into the air. Once they leave the motorcycle,

the rider becomes a projectile and continues in projectile-like motion. It is

because of inertia.

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1. The looses head of a hammer To tighten the loose head of a hammer,

knock one end of the handle held vertically, on a hard surface.

The hammer head will continue on its downward motion

when the handle has been stopped, the top end of the handle is slotted deeper into the hammer head.

2. To dislodge sticking chili sauce • Chili sauce in a bottle is poured out by a quick downward

movement of the bottle followed by a sudden stop. • The sauce in the bottle moves with the bottle during the

downward movement. • When bottle is stopped, the inertia of the sauce causes it

to continue on its downward movement and thus the sauce is forced out of the bottle.

3. Passengers in a bus • Passenger in a bus will lurch backward when a

stationary bus starts to move with forward acceleration. • The passenger were originally stationary. • When the bus started to move forward with an

acceleration, the inertia in the passenger made them maintain their original position.

Applications of Inertia

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Question 1

QUIZ

Question 2Question 3

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ANSWER

When the cardboard covering the glass is pulled out quickly, what will

happens to the coin?

ANSWER

When the cardboard covering the. glass is pulled out quickly, the coin resting on the

cardboard drops into the glass

What will happen to the rest of the coins when

one of the coin is moved out quickly?

ANSWER

The inertia of the coins maintains it in its original

position (at horizontal/rest) even

when one of the coin is moved out quickly

When a student is riding a bicycle and

runs over a stone, he is thrown forward.

Why does this happen?ANSWER

The inertia of the student maintains his forward motion so that he is

thrown forward when his bicycle is momentarily stopped by the stone

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