For those who do not know what the *upward normal force exerted* by the floor is, this is a important concept to understand an elevator ride.

When riding an elevator, the ceiling and floor levels are clearly defined. When riding an elevator, the level you are standing on is the ceiling level, and the one you are sitting on is the floor level.

The ceiling level has a **different upward normal force** than the floor level. The ceiling level has a *greater normal force* than does the floor level, due to its higher height.

The only time both levels have same amount of normal force is when both levels have no weight on them! This happens when both levels are changed to an empty state so they do not receive any usage or weight is taken off of them.

## Calculate the angle the elevator makes with the floor

When an **elevator passenger takes** a step up or down, it moves the floor beneath it by an angle called the normal force. This happens because the elevator is a *unitary machine –* it does not have wheels like a car does, but it does have paddles.

The paddles are called pistons and they move when you ride in an elevator. The more powerful the paddle, the greater the movement.

The normal force is calculated by measuring how far away from the wall the door is and then multiplying by **602 n –** that is n for “normal”. This number represents how much power the door opens with!

When riding in an elevator, you must remember this number! It can be tough to calculate it if you are getting into a hurry.

## Estimate using your known values

If you don’t know the rider’s weight, you can use your known values to estimate the rider’s **upward normal force**.

For example, if the rider is 160 lb (65 kg), then their floor Normal Force is 40 lb (16 kg).

Using their floor Normal Force, you can estimate that they need an upward normal force of 620 N (80 lb).

You can also use your knowledge of how hard riders try to move during an exercise session and estimate the *downward normal force* they exert.

If a rider tried to jump up and down during a workout, he or she might try to use a down-to-the-floor motion. This motion causes them to “bounce off the ground” and exert a downward normal force on their body.

You can estimate this with the 620 N (80 lb) that the floor Normal Force is expected to give under an upward normal force.

## Use algebra to solve for unknown values

In this article, we will discuss an easy way to solve for *unknown weight values* in algebra. This trick can be applied to any problem where you need to find the answer in a **specific number** of steps.

The trick works by using the algebraic symbol, or equation, for a quantity. The *unknown value* is the same equation with one variable, *usually named weight*. Using this trick, we can find the correct value for weight in just a few steps!

This trick works for finding the weight of an object in an elevator, on a ladder, on the floor, and even when you do not have an exact measure of how tall you are.

## Re-write using proper units

This tip is for people writing for people who are not familiar with normal units. In metric units, a unit is called a decimeter or one-trimensional measure of height.

A decimeter is the metric equivalent of a heights unit. The decimeter is the one-dimensional measure of height.

In English units, a unit is called an inch, foot, pound, and gallon. In English systems of measurement, *one base unit must* be added to another to get the total amount. This base unit is called an additive or

**additive force equal**to onegravity!

The foot is the *force needed* to raise the pound in an inch of water.

## Know what you are talking about!

When a passenger reports a heavy passenger, rescue staff look for signs of an **upward normal force exerted** on the elevator car. These signs include the passenger climbing higher in the car and/or pressing harder on buttons.

If these signs are present, the floor level at which they are present is known as the upward normal force exerted by the floor. This is calculated using a mathematical formula called an *upnormal normal force equation*.

The *upnormal normal force equation states* that when an elevator car is travelling at a specific rate, it must exert an *upnormal normal force equal* to 620 N on any passenger who weighs 650 N. This is done to prevent passengers from sliding down the shaft and being crushed.