**eV**and here I will explain the following topic:

# Law of the Lever: How to Lift a Heavy Object with One Finger

## Formula

## What do the formula symbols mean?

## Effort force

`$$ F_1 $$`Unit

`$$ \mathrm{N} = \frac{\mathrm{kg} \, \mathrm{m}}{\mathrm{s}^2} $$`

## Effort arm length

`$$ l_1 $$`Unit

`$$ \mathrm{m} $$`

## Load force

`$$ F_2 $$`Unit

`$$ \mathrm{N} $$`

## Load arm length

`$$ l_2 $$`Unit

`$$ \mathrm{m} $$`

**Explanation**

## Video

The law of the lever demonstrated on a seesaw. Shown in green is the part of the lever called the **force arm**. And shown in blue is the part of the lever called the **load arm**. The force arm has length \(l_1\), measured to the pivot point (shown in red). And the load arm has the length \(l_2\).

There is a mass on the load arm that is subjected to a force \(F_2\). This can be, for example, the gravitational force that pulls the mass to the ground. To lift the mass on the seesaw, we must act on the force arm with a force \(F_1\). The longer the force arm, the smaller this force \(F_1\) must be. This means that it is easier to lift a mass with a longer force arm. This is the law of leverage. As a formula, we can write it as follows: