# Elevator Question

1. Nov 2, 2005

### gr3g1

If a man weights 50kg, but a scale in the elevator says he is 300N, what can you say about the acceleration?

Thanks a lot

2. Nov 2, 2005

### verty

What does a scale measure? What is it measuring in this question? What would a scale tell you on the moon?

3. Nov 2, 2005

### gr3g1

The scale is weighing how heavy he is in newtons

4. Nov 2, 2005

### Integral

Staff Emeritus
More correctly, he has a mass of 50kg. Weight is in Newtons. What is his weight in Newtons?

5. Nov 2, 2005

### ZapperZ

Staff Emeritus
If the man is 50kg, what would be his weight (W = mg) if the elevator is not moving, for example? Now compare this with what the scale is reading, and apply your experience by remembering what you felt the last time you were on an elevator.

Zz.

6. Nov 2, 2005

w = ma
300 = 50(a)

a = 6 m/s^2?

7. Nov 2, 2005

### verty

Acceleration is a vector...

8. Nov 2, 2005

### gr3g1

6ms^2 upwards?

9. Nov 2, 2005

### verty

It almost seems you are just looking for answers. Figure out the answer.

10. Nov 2, 2005

### gr3g1

I am, because it was a question on my test!

11. Nov 2, 2005

### verty

It doesn't help to know an answer without understanding it. All the information is in this thread. Read through it again and try to understand.

12. Nov 2, 2005

### Integral

Staff Emeritus
Where did you get that value of a?