# When an elevator moves upwards with an acceleration

## Homework Statement

When an elevator moves upwards with an acceleration, what is the equation for tension?

Is it T+W =ma?

When an elevator moves downwards with an acceleration, would the equation be

T+W=-ma?

Thats all. Thanks.

I really can't figure it out. All I know is that the equations T-mg=ma (for upwards) and T-mg=-ma (downwards) are wrong.

## Answers and Replies

SammyS
Staff Emeritus
Homework Helper
Gold Member

Draw a Free Body Diagram for each case. Use Fnet=ma .

N = mg + ma if the elevator has an upward acceleration
N = mg - ma if the elevator has a downward acceleration

Would tension be the same as normal force in this situation?

SammyS
Staff Emeritus
Homework Helper
Gold Member

For this problem, what is the normal force being used for?

Draw a Free Body Diagram for each case. Use Fnet=ma .

For this problem, what is the normal force being used for?

Draw a Free Body Diagram for each case. Use Fnet=ma .
I got the problem right. Thanks for your help!