- #1

Tomdoml

- 3

- 0

## Homework Statement

I've gone out and measured my changing weight in an elevator using a bathroom scale, taking measurements each second, with the elevator ascending 4 storeys. Im wondering if it is possible to work out the acceleration of the elevator from these results, and if so how they relate to Newton's 2st and 3rd law.

e.g.1 mass = 75kg

mass inside elevator = 81kg

e.g.2 mass = 75kg

mass inside elevator = 70kg

## Homework Equations

F=ma

g=9.8

Those should break down to give these?

F = m * (g + a)

a = F / m – g

## The Attempt at a Solution

e.g.1 a = (81 * 9.8)N / 75kg – 9.8ms-2

a = 0.784ms-2 Upwards

e.g.2 a = (70 * 9.8)N / 75kg – 9.8ms-2

a = -0.653ms-2 Upwards