What is inertia? Explain
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Explanation:
Inertia is the resistance of any physical object to any change in its velocity. This includes changes to the object's speed, or direction of motion. ... Thus, an object will continue moving at its current velocity until some force causes its speed or direction to change.
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Types of Inertia:-
- Inertia of rest - An object stays where it is placed, and it will stay there until you or something else moves it. (i.e. Dust particles stay at rest until you shake a carpet.)
- Inertia of motion - An object will continue at the same speed until a force acts on it. (i.e. Body going forward when a car stops.)
- Inertia of direction - An object will stay moving in the same direction unless a force acts on it. (i.e. One's body movement to the side when a car makes a sharp turn.)
Examples of Inertia of Rest:-
- If pulled quickly, a tablecloth can be removed from underneath the dishes. The dishes have the tendency to remain still as long as the friction from the movement of the tablecloth is not too great.
- If a stopped car is hit by a moving car from behind, the passengers inside may experience whiplash as a result of the body moving forward but the head lagging behind. The head is experiencing inertia.
Examples of Inertia of Motion:-
- Seat belts tighten in a car when it stops quickly.
- Men in space find it more difficult to stop moving because of a lack of gravity acting against them.
Examples of Inertia of Direction:-
- Hovercraft can be a challenge to manipulate because, unlike cars, they do not have the same level of friction, so inertia causes the hovercraft to want to continue in its same direction without stopping or turning.
- Abruptly stopping a cart with an object on top causes the object on top to fall off. Inertia causes this by making the object want to continue moving in the direction that it was.
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