Inertia copy 2
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Transcript of Inertia copy 2
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.
This is known as inertia of motion.
If the object is moving….
It tends to stay in that position unless some force puts that object into motion.
This is inertia of rest.
If an object is at rest…
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"
RELATIONSHIP BETWEEN MASS AND
INERTIA
An object with larger mass have larger inertia
When mass increases inertia also increases
Applications of inertiaSome examples of using inertia in our daily life are :
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. The wet fur of cats and dogs.• Cats and dogs dry their wet fur by shaking their body
vigorously. • Water droplets on the fur tend to continue in motion when the
body has stopped shaking. • water droplets will be separated from the fur and fall away
3. 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.
4. 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.
When the cardboard covering the glass is pulled out quickly, the coin resting on the cardboard drops into
the glass
The inertia of the coins maintains it in its original
position (at horizontal/rest) even when one of the coin
is moved out quickly