# EV3 Phi. Inertia. Simple explanation and example ProPreview

We will explain inertia non-scientifically so that we make it easy to understand concept.

• #410
• 15 Apr 2017
• 2:36

### Definition of inertia

The desire of an object to keep doing what it is currently doing, the way it is doing it.
Sometimes you may hear about some person being INERT.
Usually, old people with a lot of experience will keep doing things the way they know it works.

Back to inertia for robots and all other objects:
Every object is trying to maintain its current movement. If you try to stop a bike downhill, it will try to keep moving.

### Examples of inertia

If you try to move a bike at rest, it will try to remain at rest.

Same applies to the cup on top of the robot.
When the robot and the cup are at rest, the cup tries to remain at rest and falls behind.
Then the robot is moving the cup and suddenly stops, the cup tries to keep on moving and falls off.

That is inertia in a nutshell.

### English

The cup falls from the robot for two reasons. First, inertia. Second, acceleration. They are very tightly connected so it's a good idea to now discuss what is inertia and what is acceleration.

Inertia, not the scientific definition but a definition that I'll give in this video. Inertia is the desire of an object like a cup of coffee constructed from Lego parts to keep moving the way it is moving. Sometimes you might here about some person that's called that's being inert. Usually, old people with a lot of experience will keep doing things the way they know it works. Back to the inertia for robots and for all other objects. Every object like a robot or a construction every object is trying to maintain its current movement. If you try to stop a bike while you are moving downhill it will try to keep moving. If you try to move the bike at rest, it will remain at rest. Same applies for the cup of the robot. When the robot and the cup are at rest the cup tries to remain at rest and it falls behind when you accelerate. When the robot is moving and suddenly stops the cup will try to maintain its current movement so it just moves forward and it will fall from the robot. Again, to see it as an example.

Because the robot stops but the robot with the cup has some inertia the cup will continue.

Now, the robot does not continue because we have the wheels and we have the tires and there is some friction between the tires and the table and that's why to robot stops. But for the cup the cup just continues.

## Courses and lessons with this Tutorial

This Tutorial is used in the following courses and lessons

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