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## Homework Statement

Is it possible for a box going down on a frictionless incline plane to have not a negative accleration but positive accleration? Please help, it is confusing.

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- Thread starter hager
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- #1

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Is it possible for a box going down on a frictionless incline plane to have not a negative accleration but positive accleration? Please help, it is confusing.

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berkeman

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## Homework Statement

Is it possible for a box going down on a frictionless incline plane to have not a negative accleration but positive accleration? Please help, it is confusing.

## Homework Equations

## The Attempt at a Solution

Acceleration is a vector quantity. So the sign of the vector depends on how you choose your coordinate system. If an object is free-falling at the surface of the Earth, then the acceleration due to gravity "g" is positive if the Z axis points down, and negative if it points up. As long as you keep your coordinate system consistent, you could choose either way.

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