# F=ma question

## Homework Statement

A person weighing 0.6 kN rides in an elevator
that has a downward acceleration of 3 m/s2.
The acceleration of gravity is 9.8 m/s2 .
What is the magnitude of the force of the
elevator floor on the person?
Answer in units of kN.

F = ma

## The Attempt at a Solution

Is the downward acceleration of the elevator and gravity in the same direction, so should the acceleration in the formula equal the sum of the acceleration of the elevator and gravity.
Or are they in opposite directions?

## Answers and Replies

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ideasrule
Homework Helper
What do you think? Do you feel lighter on an elevator accelerating downwards, or heavier?

lighter, so would is acceleration due to gravity upwards?

ideasrule
Homework Helper
Acceleration due to gravity is downwards because gravity doesn't change; it depends only on the Earth. However, the effect of the elevator's acceleration counteracts the effect of gravity.

thanks