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## Homework Statement

A slope is inside an elevator. A body with the mass of m is on the slope. θ=30°.

What would be the acceleration of the body in relative to the elevator if the elevator rises with an acceleration of 0.5g?

What would be the acceleration of the body in relative to the earth if the elevator rises with an acceleration of 0.5g?

## Homework Equations

ma=F

## The Attempt at a Solution

This question got me really confused. When am I supposed to add the fictitious force? When looking at the body in relative to the elevator or in relative to the earth?

The calculation itself is simple, but I can't figure in what case do I need to add the fictitious force. Thanks a lot.